JPH049738A - Method for washing fracture - Google Patents
Method for washing fractureInfo
- Publication number
- JPH049738A JPH049738A JP11060190A JP11060190A JPH049738A JP H049738 A JPH049738 A JP H049738A JP 11060190 A JP11060190 A JP 11060190A JP 11060190 A JP11060190 A JP 11060190A JP H049738 A JPH049738 A JP H049738A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- fe3o4
- cracked surface
- several times
- inert gas
- 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
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005406 washing Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000008642 heat stress Effects 0.000 abstract 1
- 238000005211 surface analysis Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発°明は一般産業機械製品の事故調査に適用される破
面解析時の破面洗浄法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fracture surface cleaning method during fracture surface analysis applied to accident investigation of general industrial machinery products.
機械の損傷事故の解明の一環として破面解析は有効な手
段であり数多くの実績がある。特に金属疲労の破面解析
にあたっては応力の繰返しによって生じるミクロ的な縞
模様（ストライエーションと呼ばれ、そのピッチは１
ｍｍ以下）のピッチを測定し、その応力を定量的に求め
ることができ常に用いられている。Fracture surface analysis is an effective method as part of elucidating mechanical damage accidents, and has many achievements. In particular, when analyzing the fracture surface of metal fatigue, microscopic striped patterns (called striations) caused by repeated stress, whose pitch is 1
It is always used because it can measure the pitch (mm or less) and quantitatively determine the stress.
しかし、高温で使用された鉄鋼のき裂面には四三酸化鉄
（Ｆｅ５０．）のスケールが固着しており、そのスケー
ルの上から破面を観察しても破面解析に必要な情報は得
られなかった。However, scale of triiron tetroxide (Fe50.) adheres to the crack surface of steel used at high temperatures, and even if the fracture surface is observed from above the scale, the information necessary for fracture surface analysis cannot be obtained. I couldn't get it.
従って、き裂破面のＦｅ、０．を除去しなければならな
いが、その方法として例えば外力を加えてＦｅ３Ｏ４を
機械的に剥離させる機械的な方法や例えばき裂破面を有
する試料を塩酸水溶液中に浸漬し超音波洗浄を行う化学
的方法等があるが、前者は破面に塑性変形や傷が生じる
欠点があり、後者はＦｅ、Ｄ、を均一に除去できず、か
つ破面のメタル側まで腐食が進行する欠点があった。い
ずれにしても破面に損傷を与えるため、ミクロ的な破面
形態等の情報は得られにくかった。Therefore, Fe on the crack surface is 0. For example, a mechanical method in which Fe3O4 is mechanically peeled off by applying an external force, or a chemical method in which a sample with a cracked surface is immersed in an aqueous hydrochloric acid solution and then subjected to ultrasonic cleaning. However, the former has the disadvantage of causing plastic deformation and scratches on the fracture surface, while the latter has the disadvantage of not being able to uniformly remove Fe and D, and corrosion progressing to the metal side of the fracture surface. In either case, the fracture surface is damaged, making it difficult to obtain information such as the microscopic morphology of the fracture surface.
上述したように、破面解析は一般機械部品の損傷原因を
究明するにあたり非常に有効な手法であるが、き裂面に
固着するＦＥ！３０４を完全に除去することができない
のが現状であった。本発明はこ技術水準に鑑み、き装面
に固着するＦｅ、０゜を完全に除去すことができる方法
を提供しようとするものである。As mentioned above, fracture surface analysis is a very effective method for investigating the cause of damage to general mechanical parts, but FE that adheres to the crack surface! At present, it is not possible to completely remove 304. In view of this state of the art, it is an object of the present invention to provide a method that can completely remove Fe, 0° adhering to a mounting surface.
本発明は鉄鋼のき裂破面に、真空中又は不活性ガス中で
４５０℃〜６００℃の範囲の熱サイクルを交互に数回与
え、破面に生成している四三酸化鉄のスケールを強制的
に剥離させることを特徴とする破面洗浄法である。The present invention applies thermal cycles in the range of 450°C to 600°C several times in vacuum or in an inert gas to the cracked surface of steel, forcing the scale of triiron tetroxide that has formed on the fractured surface. This is a fracture surface cleaning method characterized by peeling off the fracture surface.
第１図にＣｒ−Ｍｏ鋼及びＰｅ３Ｌの温度と熱膨張係数
との関係を示したように、Ｆｅ＋０＜の熱膨張係数は５
００℃付近になると結晶構造の変化のため著しく増大し
、［：ｒ−Ｍｏ ｆｍのそれに比べ１．５倍となる。こ
の熱膨張差に注目してなされたのが本発明であり、鉄鋼
の破面にＦｅＪ＜の固着したＣｒ−Ｍｏ鋼を５００℃〜
５５０℃に加熱することによりＦｅ＋０４はＣｒ−Ｍｏ
鋼より熱膨張が大であるのでＦｅ５ＬとＣｒ−Ｍｏ鋼
との界面にき裂が生じる。この１回だけではＦｅ５０．
は完全に剥離しないので、５００℃〜５５０℃から約４
５０℃に一旦降温又は約６００℃に昇温させ再び５００
℃〜５５０℃にすることを数回繰り返すことによって破
面に固着したＦｅａｒ＜とＣｒ−Ｍｏ ＠との伸び差に
よる熱応力で強制的に剥離させようとするものである。As shown in Figure 1, the relationship between temperature and thermal expansion coefficient for Cr-Mo steel and Pe3L, the thermal expansion coefficient for Fe+0< is 5.
At around 00°C, it increases significantly due to changes in the crystal structure, and is 1.5 times as large as that of [:r-Mo fm. The present invention was developed by paying attention to this difference in thermal expansion.
By heating to 550℃, Fe+04 becomes Cr-Mo
Since thermal expansion is larger than that of steel, cracks occur at the interface between Fe5L and Cr-Mo steel. Fe50.
does not peel off completely, so from 500℃ to 550℃
Temperature is lowered to 50℃ or raised to approximately 600℃ and then heated to 500℃ again.
C. to 550.degree. C. several times to forcibly peel off the material using thermal stress caused by the difference in elongation between Fear< and Cr-Mo@, which are fixed to the fracture surface.
第２図に示す熱ザイクルによって、Ｆｅ、、０．を破面
に有する鉄鋼を真空炉又は不活性ガス雰囲気炉に入れ、
４５０℃及び５００℃の加熱冷却を数回繰り返す。その
時のインターバルは１０分／１回とする。数回くり返し
た後１００℃に冷却するまで真空保持又は不活性ガス雰
囲気として、１００℃以下は大気放冷する。By the thermal cycle shown in FIG. 2, Fe, 0. The steel having a fractured surface is placed in a vacuum furnace or an inert gas atmosphere furnace,
Heating and cooling at 450°C and 500°C are repeated several times. The interval at that time is 10 minutes/time. After repeating this several times, the mixture is kept in vacuum or in an inert gas atmosphere until cooled to 100°C, and is allowed to cool in the atmosphere below 100°C.
この操作により、第３図に示すように、１で示すＰｅ５
ｔ＜と鉄鋼２との界面１ａには熱膨張差に起因する熱応
力が繰り返し作用してｌのＦｅ、Ｑ。By this operation, as shown in FIG. 3, Pe5 indicated by 1
Thermal stress caused by the difference in thermal expansion acts repeatedly on the interface 1a between t< and the steel 2, causing the Fe and Q of 1 to increase.
は鉄鋼２の界面１ａから剥離する。peels off from the interface 1a of the steel 2.
効果は次のとおりである。 The effects are as follows.
（１） 破面に損傷（例えば変形、腐食及び酸化）を
与えることなく破面に固着しているＦｅａＯ＝を除去す
ることができる。(1) FeaO= adhering to the fracture surface can be removed without damaging the fracture surface (for example, deformation, corrosion, and oxidation).
（２）ミクし】的な破面解析ができるため、損傷の原因
を究明し、その対策を樹立することができる。(2) Since fracture surface analysis can be performed in a similar manner, it is possible to investigate the cause of damage and establish countermeasures.
（３）−度に多量の破面洗浄ができ、コストも安くなる
。(3) - A large amount of fractured surfaces can be cleaned at one time, and costs are reduced.
第１図はＣｒ−Ｍｏ鋼及びＦｅ５０．のメタル温度と熱
膨張係数との関係図表、第２図は本発明の一実施例の加
熱・冷却の操作図表、第３図は本発明の一実施例の鉄綱
破面の模式横断面図である。
第１ 図
温 度 （′Ｃ）
第２図Figure 1 shows Cr-Mo steel and Fe50. Figure 2 is a diagram of the relationship between metal temperature and coefficient of thermal expansion, Figure 2 is a heating/cooling operation diagram of an embodiment of the present invention, and Figure 3 is a schematic cross-sectional view of a fractured surface of a steel rod in an embodiment of the present invention. It is. Figure 1 Temperature ('C) Figure 2
Claims (1)
〜６００℃の範囲の熱サイクルを交互に数回与え、破面
に生成している四三酸化鉄のスケールを強制的に剥離さ
せることを特徴とする破面洗浄法。450℃ in vacuum or inert gas on the cracked surface of steel
A fracture surface cleaning method characterized by alternately applying heat cycles in the range of ~600°C several times to forcibly exfoliate triiron tetroxide scale generated on the fracture surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11060190A JPH049738A (en) | 1990-04-27 | 1990-04-27 | Method for washing fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11060190A JPH049738A (en) | 1990-04-27 | 1990-04-27 | Method for washing fracture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH049738A true JPH049738A (en) | 1992-01-14 |
Family
ID=14539985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11060190A Pending JPH049738A (en) | 1990-04-27 | 1990-04-27 | Method for washing fracture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049738A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006040706A (en) * | 2004-07-27 | 2006-02-09 | Japan Storage Battery Co Ltd | Storage battery |
| CN112345647A (en) * | 2021-01-05 | 2021-02-09 | 中南大学 | Surrounding rock loosening ring test method |
-
1990
- 1990-04-27 JP JP11060190A patent/JPH049738A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006040706A (en) * | 2004-07-27 | 2006-02-09 | Japan Storage Battery Co Ltd | Storage battery |
| CN112345647A (en) * | 2021-01-05 | 2021-02-09 | 中南大学 | Surrounding rock loosening ring test method |
| CN112345647B (en) * | 2021-01-05 | 2021-04-23 | 中南大学 | A test method for loose circle of surrounding rock |
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