JPH062093A - Manufacture of intermetallic compound precipitated high strength ni-cr-mo alloy member excellent in corrosion resistance - Google Patents
Manufacture of intermetallic compound precipitated high strength ni-cr-mo alloy member excellent in corrosion resistanceInfo
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- JPH062093A JPH062093A JP18184992A JP18184992A JPH062093A JP H062093 A JPH062093 A JP H062093A JP 18184992 A JP18184992 A JP 18184992A JP 18184992 A JP18184992 A JP 18184992A JP H062093 A JPH062093 A JP H062093A
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- alloy
- intermetallic compound
- corrosion resistance
- alloy member
- treatment
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、金属間化合物析出型
高強度Ｎｉ−Ｃｒ−Ｍｏ系合金部材の耐食性を一段と向
上させる方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for further improving the corrosion resistance of intermetallic compound precipitation type high strength Ni-Cr-Mo alloy members.
【０００２】[0002]
【従来の技術】従来、一般に強度と耐食性が要求される
各種構造部材、例えば石炭火力発電装置に併設される排
煙脱硫装置の循環水ポンプインペラーなどの製造に、均
質化処理に続いての析出処理で素地に金属間化合物を分
散析出せしめて強度向上をはかった各種のＮｉ基合金が
用いられていることは良く知られるところである。2. Description of the Related Art Conventionally, various structural members generally required to have strength and corrosion resistance, for example, a circulating water pump impeller for a flue gas desulfurization unit attached to a coal-fired power plant, have been subjected to homogenization treatment followed by precipitation. It is well known that various Ni-based alloys are used that have been treated to disperse and deposit an intermetallic compound on the substrate to improve the strength.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の各種製造
設備の高性能化並びに省力化はめざましく、これに伴な
い構造部材の使用条件も厳しさを増し、例えば上記の排
煙脱硫装置の循環水ポンプインペラーにおいても腐食環
境が一段と苛酷になっているが、従来の各種金属間化合
物析出型高強度Ｎｉ基合金においては、強度は十分であ
るが、耐食性が不十分であるために、かかる苛酷な腐食
環境下では腐食進行が速く、相対的に使用寿命の短命化
が避けられないのが現状である。On the other hand, in recent years, high performance and labor saving of various manufacturing facilities have been remarkable, and the use conditions of the structural members have increased accordingly. For example, the circulation of the above-mentioned flue gas desulfurization device has been increased. The water pump impeller also has a more severe corrosive environment. However, in the conventional various intermetallic compound precipitation type high-strength Ni-based alloys, the strength is sufficient, but the corrosion resistance is insufficient. Under the severe corrosive environment, the corrosion progresses rapidly and the service life is inevitably shortened.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、金属間化合物析出型高強度Ｎｉ
基合金部材の耐食性を向上させるべく研究を行なった結
果、均質化処理、望ましくは１１５０〜１２５０℃の温
度での均質化処理に続いての析出処理、望ましくは５０
０〜８００℃の温度での析出処理で、素地に金属間化合
物を分散析出させて強度向上をはかったＮｉ基合金、望
ましくは、重量％で（以下、単なる％は重量％を示
す）、 Ｃｒ：１８〜４２％、 Ｍｏ：１３〜２８％、 （ただし、Ｃｒ＋Ｍｏ：３５〜５５％）、を含有し、さ
らに必要に応じて、（ａ） Ｆｅ：１〜１０％、（ｂ）
Ｗ，Ｃｕ、およびＶのうちの１種または２種以上：
０．１〜５％、（ｃ） Ｃｏ：０．１〜５％、以上
（ａ）〜（ｃ）のうちの１種または２種以上、を含有
し、残りがＮｉと不可避不純物からなる組成を有するＮ
ｉ−Ｃｒ−Ｍｏ系合金の部材に、加熱処理、望ましくは
温度：９５０〜１２００℃に１〜１５分間保持後急冷の
加熱処理を施して、上記金属間化合物の１〜２０面積％
を再固溶させると、上記部材の耐食性が高強度を維持し
た状態で著しく向上するようになるという研究結果を得
たのである。Therefore, the present inventors have
From the above viewpoint, intermetallic compound precipitation type high strength Ni
As a result of research to improve the corrosion resistance of the base alloy member, a homogenization treatment, preferably a homogenization treatment at a temperature of 1150 to 1250 ° C., followed by a precipitation treatment, preferably 50
A Ni-base alloy in which an intermetallic compound is dispersed and precipitated on a base material to improve strength by a precipitation treatment at a temperature of 0 to 800 ° C., preferably in wt% (hereinafter, simply% indicates wt%), Cr : 18-42%, Mo: 13-28%, (however, Cr + Mo: 35-55%), and, if necessary, (a) Fe: 1-10%, (b).
One or more of W, Cu, and V:
0.1 to 5%, (c) Co: 0.1 to 5%, containing 1 or 2 or more of the above (a) to (c), and the balance consisting of Ni and unavoidable impurities With N
A member of the i-Cr-Mo alloy is subjected to heat treatment, preferably, holding at a temperature of 950 to 1200 ° C. for 1 to 15 minutes, followed by heat treatment of quenching to give 1 to 20 area% of the intermetallic compound.
It was obtained the research result that the corrosion resistance of the above-mentioned member is remarkably improved when it is re-dissolved in the state where the high strength is maintained.
【０００５】なお、このように金属間化合物の一部を素
地に再固溶させると耐食性が飛躍的に向上するようにな
るという理由については、従来の金属間化合物析出型Ｎ
ｉ基合金部材では、素地中に析出する金属間化合物周辺
部のＣｒおよびＭｏの固溶含有量が素地におけるそれに
比してミクロ的に低くなっており、これが原因で前記金
属間化合物周辺部から腐食が進行していたものが、上記
の通り金属間化合物の一部を再固溶させると、金属間化
合物周辺部のＣｒおよびＭｏの固溶含有量が素地のそれ
に近づくようになることから、前記金属間化合物周辺部
からの腐食が抑制されるようになるものと考えられる。The reason why the corrosion resistance is remarkably improved by re-dissolving a part of the intermetallic compound in the matrix in this way is the conventional intermetallic compound precipitation type N.
In the i-based alloy member, the solid solution contents of Cr and Mo in the peripheral portion of the intermetallic compound precipitated in the base material are microscopically lower than those in the base material. Although the corrosion was progressing, when a part of the intermetallic compound is re-dissolved as described above, the solid solution contents of Cr and Mo in the peripheral portion of the intermetallic compound come to approach that of the base material. It is considered that the corrosion from the peripheral portion of the intermetallic compound is suppressed.
【０００６】したがって、この発明は、上記の研究結果
にもとづいてなされたものであって、均質化処理に続い
ての析出処理で、素地に金属間化合物を分散析出せしめ
て強度向上をはかったＮｉ−Ｃｒ−Ｍｏ系合金部材に、
加熱処理を施して上記金属間化合物の１〜２０面積％を
再固溶させることからなる、耐食性にすぐれた金属間化
合物析出型高強度Ｎｉ−Ｃｒ−Ｍｏ系合金部材の製造方
法に特徴を有するものである。[0006] Therefore, the present invention was made based on the above-mentioned research results, and in the precipitation treatment subsequent to the homogenization treatment, the intermetallic compound was dispersed and precipitated on the base material to improve the strength of Ni. -For Cr-Mo alloy members,
It is characterized by a method for producing an intermetallic compound precipitation-type high-strength Ni-Cr-Mo-based alloy member having excellent corrosion resistance, which comprises subjecting 1 to 20 area% of the above intermetallic compound to a solid solution by heat treatment. It is a thing.
【０００７】つぎに、この発明の方法において、Ｎｉ−
Ｃｒ−Ｍｏ系合金部材の望ましい組成を上記の通りに定
めた理由を説明する。 （ａ） ＣｒおよびＭｏ ＣｒおよびＭｏ成分には、共存した状態で素地に固溶し
て、これの耐食性を向上させるほか、素地に微細に分散
析出する金属間化合物を形成して、強度と硬さを向上さ
せる作用があるが、その含有量がＣｒ：１８％未満およ
びＭｏ：１３％未満にして、Ｃｒ＋Ｍｏ：３５％未満で
は前記作用に所望の効果が得られず、一方その含有量が
Ｃｒ：４２％、Ｍｏ：２８％、およびＣｒ＋Ｍｏ：５５
％を越えると鋳造性が急激に低下するようになることか
ら、上記含有量とするのが望ましい。Next, in the method of the present invention, Ni-
The reason why the desirable composition of the Cr-Mo alloy member is determined as described above will be described. (A) Cr and Mo Cr and Mo components, in the coexisting state, form a solid solution with the base material to improve the corrosion resistance thereof, and also form an intermetallic compound that is finely dispersed and precipitated in the base material to improve strength and hardness. However, if the content of Cr is less than 18% and Mo: less than 13%, and Cr + Mo: less than 35%, the desired effect cannot be obtained, while the content of Cr is less than 35%. : 42%, Mo: 28%, and Cr + Mo: 55
If it exceeds%, the castability will drop sharply, so the above content is desirable.
【０００８】（ｂ） Ｆｅ Ｆｅ成分には、Ｎｉの一部を代替しても特性を何ら損な
わない作用があるので、経済性を考慮してＮｉの一部を
Ｆｅで置換してもよいが、この場合その含有量が１％未
満では所望の経済効果が得られず、一方その含有量が１
０％を越えると耐食性が劣化するようになることから、
その含有量は１〜１０％としなければならない。(B) Fe Since the Fe component has a function of not impairing the characteristics even if a part of Ni is replaced, a part of Ni may be replaced with Fe in consideration of economical efficiency. In this case, if the content is less than 1%, the desired economic effect cannot be obtained, while the content is 1
If it exceeds 0%, the corrosion resistance will deteriorate,
Its content must be 1-10%.
【０００９】（ｃ） Ｗ，Ｃｕ、およびＶ これらの成分には、さらに耐食性を向上させる作用があ
るので、必要に応じて含有させるとよいが、その含有量
が０．１％未満では所望の耐食性向上効果が得られず、
一方その含有量が５％を越えると鋳造欠陥が発生し易く
なることから、その含有量は０．１〜５％とするのが望
ましい。(C) W, Cu, and V These components have the effect of further improving the corrosion resistance, so they may be contained if necessary, but if their content is less than 0.1%, they are desirable. The effect of improving corrosion resistance cannot be obtained,
On the other hand, if the content exceeds 5%, casting defects are likely to occur, so the content is preferably 0.1-5%.
【００１０】（ｄ） Ｃｏ Ｃｏ成分には、硬さを増して耐摩耗性を向上させる作用
があるので、必要に応じて含有させるとよいが、その含
有量が０．１％未満では所望の耐摩耗性向上効果が得ら
れず、一方その含有量が５％を越えると脆化傾向が現わ
れるようになることから、その含有量は０．１〜５％と
するのが望ましい。(D) Co The Co component has the effect of increasing hardness and improving wear resistance, so it may be contained if necessary, but if the content is less than 0.1%, it is desirable. The effect of improving wear resistance cannot be obtained, and if the content exceeds 5%, a brittleness tends to appear. Therefore, the content is preferably 0.1 to 5%.
【００１１】また、上記Ｎｉ−Ｃｒ−Ｍｏ系合金部材に
施される均質化処理および析出処理は通常の条件でよ
く、１１５０〜１２５０℃での均質化処理および５００
〜８００℃での析出処理が一般的である。Further, the homogenizing treatment and the precipitation treatment applied to the Ni-Cr-Mo alloy member may be carried out under ordinary conditions, such as homogenizing treatment at 1150 to 1250 ° C and 500.
A precipitation treatment at ˜800 ° C. is common.
【００１２】さらに、この発明の方法において、素地中
に析出している金属間化合物の１〜２０面積％を素地中
に再固溶させるための熱処理は、上記の通り９５０〜１
２００℃に１〜１５分間保持後急冷（水冷、強制空冷な
ど）の条件で行なうのが望ましく、またこの場合の１〜
２０面積％の再固溶割合は経験的に定めたものであっ
て、その割合が１面積％未満では所望の耐食性向上効果
が得られず、一方その割合が２０面積％を越えると強度
低下が著しくなるという理由にもとづくものである。Further, in the method of the present invention, the heat treatment for re-dissolving 1 to 20 area% of the intermetallic compound precipitated in the matrix in the matrix is as described above.
After holding at 200 ° C for 1 to 15 minutes, it is desirable to perform rapid cooling (water cooling, forced air cooling, etc.) under the conditions.
The re-dissolution ratio of 20 area% is empirically determined, and if the ratio is less than 1 area%, the desired effect of improving corrosion resistance cannot be obtained, while if the ratio exceeds 20 area%, the strength is reduced. It is based on the reason that it becomes significant.
【００１３】[0013]
【実施例】つぎに、この発明の方法を実施例により具体
的に説明する。通常の高周波炉を用い、Ａｒ雰囲気中、
それぞれ表１，２に示される成分組成をもったＮｉ−Ｃ
ｒ−Ｍｏ系合金溶湯を調製し、直径：６０mm×長さ：２
００mmの寸法をもった部材に鋳造し、この部材に、１１
５０〜１２５０℃の範囲内の所定温度に１０時間保持の
条件で均質化処理を施した後、５００〜８００℃の範囲
内の所定温度に３時間保持の条件で析出処理を施すこと
により従来方法１〜２４を行ない、Ｎｉ−Ｃｒ−Ｍｏ系
合金部材をそれぞれ製造した。EXAMPLES Next, the method of the present invention will be specifically described by way of examples. Using a normal high frequency furnace, in Ar atmosphere,
Ni-C having the composition shown in Tables 1 and 2, respectively
Prepared r-Mo alloy melt, diameter: 60 mm x length: 2
Cast into a member with a dimension of 00 mm,
A homogenization treatment is carried out at a predetermined temperature in the range of 50 to 1250 ° C. for 10 hours, and then a precipitation treatment is carried out at the predetermined temperature in the range of 500 to 800 ° C. for 3 hours. 1-24 was performed and each Ni-Cr-Mo type | system | group alloy member was manufactured.
【００１４】ついで、上記従来方法１〜２４で製造され
たＮｉ−Ｃｒ−Ｍｏ系合金部材に対して、表３，４に示
される条件（冷却はいずれも水冷）で加熱処理を施すこ
とにより本発明方法１〜２４をそれぞれ実施した。Next, the Ni-Cr-Mo alloy members produced by the above-mentioned conventional methods 1 to 24 are heat-treated under the conditions shown in Tables 3 and 4 (all are water-cooled). Inventive Methods 1-24 were each performed.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【表３】 [Table 3]
【００１８】[0018]
【表４】 [Table 4]
【００１９】つぎに、この結果得られた各種のＮｉ−Ｃ
ｒ−Ｍｏ系合金部材について、金属間化合物の面積率、
引張強さ、およびビッカース硬さを測定すると共に、耐
食性を評価する目的で、５０％Ｈ2 ＳＯ4 水溶液にＦｅ
2 （ＳＯ4 ）3 を４２ｇ／ｌの割合で溶解させてなる沸
騰液中に２４時間浸漬のストリーカーテストを行ない、
腐食速度（年換算）を測定した。Next, the various Ni--C obtained as a result
For the r-Mo alloy member, the area ratio of the intermetallic compound,
For the purpose of measuring tensile strength and Vickers hardness and evaluating corrosion resistance, 50% H 2 SO 4 aqueous solution was added with Fe.
2 (SO 4 ) 3 was dissolved at a rate of 42 g / l, and a streaker test of immersion for 24 hours in a boiling liquid was performed.
The corrosion rate (annual conversion) was measured.
【００２０】なお、金属間化合物の面積率は、顕微鏡組
織写真を用い、これに画像処理を施すことにより測定し
た。これらの測定結果を表１〜４にそれぞれ示した。ま
た、表３，４には金属間化合物の再固溶割合の算出結果
も示した。The area ratio of the intermetallic compound was measured by using a microstructure photograph and subjecting it to image processing. The results of these measurements are shown in Tables 1 to 4, respectively. In addition, Tables 3 and 4 also show the calculation results of the re-dissolution rate of the intermetallic compound.
【００２１】[0021]
【発明の効果】表１〜４に示される結果から、本発明方
法１〜２４で製造されたＮｉ−Ｃｒ−Ｍｏ系合金部材
は、いずれも強度が従来方法１〜２４で製造されたＮｉ
−Ｃｒ−Ｍｏ系合金部材とほぼ同等で、これより著しく
すぐれた耐食性を示すことが明らかである。上述のよう
に、この発明の方法によれば、従来方法で製造されたＮ
ｉ−Ｃｒ−Ｍｏ系合金部材の耐食性を強度をほとんど低
下させることなく一段と向上させることができるのであ
る。From the results shown in Tables 1 to 4, the Ni--Cr--Mo alloy members manufactured by the methods 1 to 24 of the present invention have the same strength as the Ni manufactured by the conventional methods 1 to 24.
It is clear that it has almost the same corrosion resistance as the -Cr-Mo alloy member, and exhibits significantly superior corrosion resistance. As described above, according to the method of the present invention, N produced by the conventional method is used.
The corrosion resistance of the i-Cr-Mo alloy member can be further improved with almost no decrease in strength.
Claims (6)
に金属間化合物を分散析出せしめて強度向上をはかった
Ｎｉ−Ｃｒ−Ｍｏ系合金部材に、 加熱処理を施して上記金属間化合物の１〜２０面積％を
再固溶させることを特徴とする耐食性のすぐれた金属間
化合物析出型高強度Ｎｉ−Ｃｒ−Ｍｏ系合金部材の製造
方法。1. A Ni-Cr-Mo alloy member, which has been subjected to a homogenization treatment and a precipitation treatment to disperse and deposit an intermetallic compound on a substrate to improve strength, is subjected to a heat treatment, and the above-mentioned intermetallic compound is subjected to the heat treatment. 1 to 20% by area is re-dissolved as a solid solution, and a method for producing a high-strength intermetallic compound precipitation type high-strength Ni-Cr-Mo alloy member having excellent corrosion resistance.
量％で、 Ｃｒ：１８〜４２％、 Ｍｏ：１３〜２８％、 （ただしＣｒ＋Ｍｏ：３５〜５５％）、を含有し、残り
がＮｉと不可避不純物からなる組成を有することを特徴
とする上記請求項１記載の製造方法。2. The Ni-Cr-Mo alloy member contains, by weight%, Cr: 18 to 42%, Mo: 13 to 28% (provided that Cr + Mo: 35 to 55%), and the remainder. The manufacturing method according to claim 1, having a composition of Ni and inevitable impurities.
量％で、 Ｃｒ：１８〜４２％、 Ｍｏ：１３〜２８％、 （ただしＣｒ＋Ｍｏ：３５〜５５％）、を含有し、さら
に （ａ） Ｆｅ：１〜１０％、 （ｂ） Ｗ，Ｃｕ、およびＶのうちの１種または２種以
上：０．１〜５％、 （ｃ） Ｃｏ：０．１〜５％、 以上（ａ）〜（ｃ）のうちの１種または２種以上、を含
有し、残りがＮｉと不可避不純物からなる組成を有する
ことを特徴とする上記請求項１記載の製造方法。3. The Ni-Cr-Mo alloy member contains, by weight%, Cr: 18 to 42%, Mo: 13 to 28% (provided that Cr + Mo: 35 to 55%), and further: a) Fe: 1 to 10%, (b) One or more of W, Cu, and V: 0.1 to 5%, (c) Co: 0.1 to 5%, or more (a ) To (c), one or more of them are contained, and the rest has a composition consisting of Ni and unavoidable impurities.
２５０℃であることを特徴とする上記請求項１，２、ま
たは３記載の製造方法。4. The temperature of the homogenization treatment is 1150-1.
It is 250 degreeC, The manufacturing method of said 1, 2, or 3 characterized by the above-mentioned.
℃であることを特徴とする上記請求項１，２，３、また
は４記載の製造方法。5. The temperature of the precipitation treatment is 500 to 800.
5. The manufacturing method according to claim 1, 2, 3, or 4, wherein the temperature is ° C.
１〜１５分間保持後急冷の条件で行なうことを特徴とす
る上記請求項１，２，３，４，５、または６記載の製造
方法。6. The method according to claim 1, 2, 3, 4, 5 or 6, wherein the heat treatment is performed at a temperature of 950 to 1200 ° C. for 1 to 15 minutes and then rapidly cooled. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18184992A JP3225604B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing intermetallic compound precipitation-strengthened Ni-Cr-Mo-based alloy cast member having excellent corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18184992A JP3225604B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing intermetallic compound precipitation-strengthened Ni-Cr-Mo-based alloy cast member having excellent corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH062093A true JPH062093A (en) | 1994-01-11 |
| JP3225604B2 JP3225604B2 (en) | 2001-11-05 |
Family
ID=16107901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18184992A Expired - Lifetime JP3225604B2 (en) | 1992-06-16 | 1992-06-16 | Method for producing intermetallic compound precipitation-strengthened Ni-Cr-Mo-based alloy cast member having excellent corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3225604B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0693565A3 (en) * | 1994-07-22 | 1996-10-16 | Haynes Int Inc | Ni-Cr-Mo alloys containing copper |
| DE10329530A1 (en) * | 2003-06-30 | 2005-02-03 | Access Materials&Processes | Casting and solidifying process for components , e.g. turbine blades, made from an intermetallic alloy comprises cooling and solidifying a melt in a mold with a holding point above the ductile brittle transition temperature of the alloy |
| JP2008121048A (en) * | 2006-11-10 | 2008-05-29 | Mitsubishi Materials Corp | Ni-base alloy excellent in corrosion resistance and wear resistance and conductor roll made of the Ni-base alloy |
-
1992
- 1992-06-16 JP JP18184992A patent/JP3225604B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0693565A3 (en) * | 1994-07-22 | 1996-10-16 | Haynes Int Inc | Ni-Cr-Mo alloys containing copper |
| CN1056418C (en) * | 1994-07-22 | 2000-09-13 | 黑尼斯国际股份有限公司 | Copper-containing NI-CR-MO alloys |
| DE10329530A1 (en) * | 2003-06-30 | 2005-02-03 | Access Materials&Processes | Casting and solidifying process for components , e.g. turbine blades, made from an intermetallic alloy comprises cooling and solidifying a melt in a mold with a holding point above the ductile brittle transition temperature of the alloy |
| JP2008121048A (en) * | 2006-11-10 | 2008-05-29 | Mitsubishi Materials Corp | Ni-base alloy excellent in corrosion resistance and wear resistance and conductor roll made of the Ni-base alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3225604B2 (en) | 2001-11-05 |
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