JPS61264155A - Spheroidal graphite cast iron having bainite matrix and its manufacture - Google Patents
Spheroidal graphite cast iron having bainite matrix and its manufactureInfo
- Publication number
- JPS61264155A JPS61264155A JP60014548A JP1454885A JPS61264155A JP S61264155 A JPS61264155 A JP S61264155A JP 60014548 A JP60014548 A JP 60014548A JP 1454885 A JP1454885 A JP 1454885A JP S61264155 A JPS61264155 A JP S61264155A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- graphite cast
- bainitic
- spheroidal graphite
- bainite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910001141 Ductile iron Inorganic materials 0.000 title abstract description 5
- 239000011159 matrix material Substances 0.000 title abstract 2
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 16
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 229910002804 graphite Inorganic materials 0.000 claims description 15
- 239000010439 graphite Substances 0.000 claims description 15
- 230000000717 retained effect Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101000599862 Homo sapiens Intercellular adhesion molecule 3 Proteins 0.000 description 1
- 102100037871 Intercellular adhesion molecule 3 Human genes 0.000 description 1
- 229910001296 Malleable iron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、耐衝撃性に優れたベーナイト基地球状黒鉛
鋳鉄およびその製法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a bainitic-based terrestrial graphite cast iron having excellent impact resistance and a method for producing the same.
（従来の技術）
近時、鋳物の軽量化、あるいは薄肉化を計るため、また
は高級材料の一部代替材として球状黒鉛鋳鉄の高強度化
が検討されており、その結果、球状黒鉛鋳鉄をオーステ
ンパー処理すること−により得られるベーナイト基地球
状黒鉛鋳鉄が、高強度と高靭性を有することは知られて
いるが、特に耐衝撃、性に優れたベーナイト基地球状黒
鉛鋳鉄を得るため、どのようにすればよいかという点に
ついては全く解明されていなかった。(Prior art) Recently, increasing the strength of spheroidal graphite cast iron has been studied in order to make castings lighter or thinner, or as a partial substitute for high-grade materials. It is known that bainitic-based terrestrial graphite cast iron obtained by tempering has high strength and toughness. There was no clear explanation as to what should be done.
（発明が解決しようとする問題点）
この発明は、上述の問題点を解決するためになされたも
ので、特に耐衝撃性に優れたベーナイト基地球状黒鉛鋳
鉄を得ることを目的とするものである。(Problems to be Solved by the Invention) This invention has been made to solve the above-mentioned problems, and its purpose is to obtain a bainitic-based terrestrial graphite cast iron having particularly excellent impact resistance. .
（問題点を解決するための手段）
上述の目的を達成するた、めこの発明においては、ベー
ナイト基地球状黒鉛鋳鉄の残留オーステナイト量を２０
〜４０％とし、またこのようにするために、ベーナイト
化温度を３００〜４００℃とする。(Means for solving the problem) In order to achieve the above-mentioned object, in this invention, the amount of retained austenite in the bainite-based terrestrial graphite cast iron is reduced to 20%.
~40%, and in order to achieve this, the bainitic temperature is set at 300-400°C.
く作 用）
この発明は、上述のようにベーナイト化温度を３００〜
４００℃とすることにより、残留オーステナイト量を２
０〜４０％として、特に耐衝撃性に優れたベーナイト基
地球状黒鉛鋳鉄を得ることができる。(Function) As described above, this invention lowers the bainitic temperature from 300 to 300.
By setting the temperature to 400℃, the amount of retained austenite can be reduced to 2
When the content is 0 to 40%, bainitic-based terrestrial graphite cast iron with particularly excellent impact resistance can be obtained.
（実施例） つぎに、この発明の詳細な説明する。(Example) Next, this invention will be explained in detail.
第 １ 表 化学組成 ％
供試材として第１表に示す化学組成のものを溶製し、第
１図（ａ ）に示すように、９００℃で１時間保持して
オーステナイト化した後、３００． ３５０゜３７５お
よび４００℃の塩浴中で１時間恒温保持後空冷してベー
ナイト化熱処理をした。Table 1 Chemical Composition % Test materials having the chemical composition shown in Table 1 were melted and held at 900°C for 1 hour to austenite, as shown in Figure 1(a), and then 300°C. After being kept at a constant temperature for 1 hour in a salt bath at 350°, 375°C and 400°C, it was cooled in air and heat-treated to form bainitic material.
また比較試料として、ＦＣＤ４０は、第１図（ｂ゛）に
示すように、９００℃で１時間保持した後炉冷し、Ｆ
ＣＤ ５０は第１図（Ｃ）に示すように、９００℃で１
時間保持してから、７００℃まで炉冷した後空冷し、Ｆ
ＣＤ ７０は、第１図（ｄ ）に示すように、１９０
０℃で１時間保持した後空冷した。As a comparative sample, FCD40 was kept at 900°C for 1 hour, cooled in a furnace, and
CD50 is 1 at 900℃, as shown in Figure 1 (C).
After holding for a period of time, the furnace was cooled to 700°C, then air-cooled, and F
CD 70 is 190 mm as shown in FIG. 1(d).
After being held at 0°C for 1 hour, it was air cooled.
これらの試料からなるＵノツチ試験片について、計装化
シャルピー衝撃試験を行って、その衝撃特性を、最大応
力（Ｐｍ）、降伏応力（Ｐｙ ） 、吸収エネルギー（
Ｅ）、亀裂生成エネルギー（Ｅｉ）および亀裂伝播エネ
ルギー（Ｅｐ）に分け、ベーナイト化温度との関係を調
べた結果は第２図に示す通りであった。Instrumented Charpy impact tests were performed on the U-notch test pieces made of these samples, and the impact properties were evaluated in terms of maximum stress (Pm), yield stress (Py), and absorbed energy (
E), crack formation energy (Ei) and crack propagation energy (Ep), and the relationship with the bainitic temperature was investigated, and the results are shown in FIG.
またベーナイト化温度と、引張強さ、耐力、および伸び
との関係は第３図に示す通りであった。Furthermore, the relationship between the bainitic temperature, tensile strength, yield strength, and elongation was as shown in FIG.
さらに、ベーナイト基地球状黒鉛鋳鉄の機械的性質は、
残留オーステナイト量に大きく影響されるから、ベーナ
イト化温度と残留オーステナイト量との関係を調べた結
果、第４図の通りであった。Furthermore, the mechanical properties of bainitic base geomorphic graphite cast iron are
Since it is greatly influenced by the amount of retained austenite, the relationship between the bainitic temperature and the amount of retained austenite was investigated and the result was as shown in FIG. 4.
すなわち第３図に示すように、ベーナイト化温度が高（
なるにしたがって、引張強さ、および耐力は低くなるが
、逆に伸びは大きくなり、３５０〜４００℃では１２％
以上になる。In other words, as shown in Fig. 3, when the bainitization temperature is high (
As the temperature increases, the tensile strength and proof stress decrease, but conversely the elongation increases, reaching 12% at 350-400℃.
That's all.
また第２図は、この発明に係るベーナイト基地球状黒鉛
鋳鉄のベーナイト化温度と衝撃特性の関係を示すと共に
、Ｆ ＣＤ ４０．．５０．７０との比較を示すもので
ある。Further, FIG. 2 shows the relationship between the bainitic temperature and the impact properties of the bainitic base terrestrial graphite cast iron according to the present invention, and also shows the relationship between the bainitic temperature and the impact properties of the bainitic base terrestrial graphite cast iron according to the present invention. ．． This shows a comparison with 50.70.
この第２図を見ると、ベーナイト化温度が高くなるにし
たがって、最大応力（ｐＨｌ）、降伏応力（Ｐｙ）は低
下するが、吸収エネルギー（Ｅ）。Looking at this Figure 2, as the bainitization temperature increases, the maximum stress (pHl) and yield stress (Py) decrease, but the absorbed energy (E) decreases.
亀裂生成エネルギー（Ｅｆ）、および亀裂伝播エネルギ
ー（Ｅｐ ）は多くなっていることがわかる。It can be seen that the crack formation energy (Ef) and the crack propagation energy (Ep) are increased.
特に亀裂生成エネルギー（Ｅｉ ）が多くなっており、
これはＦＣＤ５０およびＦ ＣＤ ７０と比較した場合
顕著である。In particular, the crack formation energy (Ei) increases,
This is remarkable when compared to FCD50 and FCD70.
したがって、ベーナイト化温度を３００−４００℃とす
ることにより耐衝撃性に優れたベーナイト基地球状黒鉛
鋳鉄を得ることができる。Therefore, by setting the bainitic temperature to 300-400°C, it is possible to obtain bainitic-based terrestrial graphite cast iron with excellent impact resistance.
また第４図に示すように、ベーナイ化温度が３００℃か
ら４００℃までの残留オーステナイト量は、２０〜４０
％の範囲内にあるから、残留オーステナイト量が、２０
〜４０％の範囲内にあるベーナイト基地球状黒鉛鋳鉄は
、耐衝撃性が優れたものとなる。Furthermore, as shown in Fig. 4, the amount of retained austenite when the baenization temperature ranges from 300°C to 400°C is 20 to 40°C.
%, the amount of retained austenite is 20%.
Bainite-based terrestrial graphite cast iron in the range of ~40% has excellent impact resistance.
（発明の効果）
上述のように、この発明によれば、ベーナイト化温度を
３００〜４００℃とすることにより、残留オーステナイ
ト量が２０〜４０％の範囲にある耐衝撃性に優れたベー
ナイト基地球状黒鉛鋳鉄が得られるから、この発明はベ
ーナイト基地球状黒鉛鋳鉄の新規な用途を開拓できると
いうすぐれた効果がある。(Effects of the Invention) As described above, according to the present invention, by setting the bainitic temperature to 300 to 400°C, a bainite base earth shape with excellent impact resistance in which the amount of retained austenite is in the range of 20 to 40% can be obtained. Since graphite cast iron can be obtained, this invention has the excellent effect of being able to develop new uses for bainite-based terrestrial graphite cast iron.
第１図（ａ）〜（ｄ ）は熱処理サイクル図、第２図は
衝撃特性図、
第３図は機械的特性図、
第４図はベーナイト化温度と残留オーステナイト量との
関係を示す線図である。
第１図
第２図
べ゛−ナイト化１度 ℃
Ｐ４１オーステナイトｉ！ｚ
仲３゛ｚ
手 続 補 正 書（方式）
昭和６０年６月４日
特許庁長官 志 賀 学 殿１、事件
の表示
昭和６０年特許願第１４５４８ 号
２、発明の名称
ベーナイト基地球状黒鉛鋳鉄およびその製法３、補正を
する者
事件との関係 特許出願人
旭可鍛鉄株式会社
４、代理人
第１図
（訂正１！ｌ）Figures 1 (a) to (d) are heat treatment cycle diagrams, Figure 2 is an impact characteristic diagram, Figure 3 is a mechanical characteristic diagram, and Figure 4 is a diagram showing the relationship between bainitic temperature and retained austenite amount. It is. Figure 1 Figure 2 Benitization 1 degree ℃ P41 Austenite i! z Naka 3 ゛ z Procedural amendment (method) June 4, 1985 Manabu Shiga, Commissioner of the Patent Office1, Indication of the case Patent Application No. 14548 of 19852, Name of the invention Bainitic base terrestrial graphite cast iron and its manufacturing method 3, relationship with the case of the person making the amendment Patent applicant Asahi Malleable Iron Co., Ltd. 4, agent Figure 1 (correction 1!l)
Claims (1)
特徴とする耐衝撃性に優れたベーナイト基地球状黒鉛鋳
鉄。 ２、ベーナイト化温度を３００〜４００℃とすることを
特徴とする耐衝撃性に優れたベーナイト基地球状黒鉛鋳
鉄の製法。[Claims] 1. A bainitic-based terrestrial graphite cast iron with excellent impact resistance, characterized by having a residual austenite content of 20 to 40%. 2. A method for producing bainite-based terrestrial graphite cast iron with excellent impact resistance, characterized by setting the bainitic temperature to 300 to 400°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60014548A JPS61264155A (en) | 1985-01-30 | 1985-01-30 | Spheroidal graphite cast iron having bainite matrix and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60014548A JPS61264155A (en) | 1985-01-30 | 1985-01-30 | Spheroidal graphite cast iron having bainite matrix and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61264155A true JPS61264155A (en) | 1986-11-22 |
Family
ID=11864201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60014548A Pending JPS61264155A (en) | 1985-01-30 | 1985-01-30 | Spheroidal graphite cast iron having bainite matrix and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61264155A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56127747A (en) * | 1980-03-08 | 1981-10-06 | Mazda Motor Corp | Vibration isolating semispherical graphite cast iron |
| JPS58207354A (en) * | 1982-05-26 | 1983-12-02 | Sugiyama Chuzo Kk | Manufacture of crane parts made of spheroidal graphite cast iron |
| JPS5910988B2 (en) * | 1978-12-13 | 1984-03-13 | ホルスト・ミユ−ルバ−ガ− | Spheroidal graphite cast iron and its manufacturing method |
-
1985
- 1985-01-30 JP JP60014548A patent/JPS61264155A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910988B2 (en) * | 1978-12-13 | 1984-03-13 | ホルスト・ミユ−ルバ−ガ− | Spheroidal graphite cast iron and its manufacturing method |
| JPS56127747A (en) * | 1980-03-08 | 1981-10-06 | Mazda Motor Corp | Vibration isolating semispherical graphite cast iron |
| JPS58207354A (en) * | 1982-05-26 | 1983-12-02 | Sugiyama Chuzo Kk | Manufacture of crane parts made of spheroidal graphite cast iron |
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