JPS6112971B2 - - Google Patents
Info
- Publication number
- JPS6112971B2 JPS6112971B2 JP6711879A JP6711879A JPS6112971B2 JP S6112971 B2 JPS6112971 B2 JP S6112971B2 JP 6711879 A JP6711879 A JP 6711879A JP 6711879 A JP6711879 A JP 6711879A JP S6112971 B2 JPS6112971 B2 JP S6112971B2
- Authority
- JP
- Japan
- Prior art keywords
- austenite
- steel material
- cast iron
- treatment
- deep cooling
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000011282 treatment Methods 0.000 claims description 13
- 229910001566 austenite Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001563 bainite Inorganic materials 0.000 claims 2
- 229910001018 Cast iron Inorganic materials 0.000 claims 1
- -1 etc. Inorganic materials 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 claims 1
- 239000010439 graphite Substances 0.000 claims 1
- 230000001131 transforming effect Effects 0.000 claims 1
- 238000005279 austempering Methods 0.000 description 6
- 229910001141 Ductile iron Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005480 shot peening Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
鉄鋼材料に対する熱処理法は種々あるが、オー
ステンパー処理もその一つである。オーステンパ
ー処理は、焼入れ及び焼もどし処理に比べて鉄鋼
材料に対してより大きい強さとじん性を与えるの
が特徴である。DETAILED DESCRIPTION OF THE INVENTION There are various heat treatment methods for steel materials, and austempering treatment is one of them. Austempering is characterized by imparting greater strength and toughness to the steel material compared to hardening and tempering treatments.
鋼系材料に対する熱処理法の一つに滲炭焼入れ
があるが、この場合には表面に圧縮応力が残留す
るが、オーステンパー処理では通常引張応力が残
留し、そのために鉄鋼材料のつかれ強さが低下す
る。このような場合、鉄鋼材料に対してシヨツト
ピーニング処理を施せば、表面層に残留する応力
は、引張り応力から圧縮応力に変わり、それに伴
い該鉄鋼材料は、つかれ強さが向上する。 One of the heat treatment methods for steel materials is charcoal quenching, but in this case, compressive stress remains on the surface, but in austempering treatment, tensile stress usually remains, which reduces the wear strength of the steel material. descend. In such a case, if shot peening is applied to the steel material, the stress remaining in the surface layer changes from tensile stress to compressive stress, and the wear strength of the steel material improves accordingly.
しかし、シヨツトピーニング処理は、弱過ぎて
は効果がなく、逆に強過ぎると鉄鋼材料の表面に
きずがつき、それが切り欠きの働きをするため、
該鉄鋼材料のつかれ強さは、シヨツトピーニング
処理を施す前よりむしろ低下する。焼入れ並びに
焼もどし処理を施した鉄鋼材料には、程度の差は
あるが、オーステナイトが残留するのが普通であ
る。ベアリング鋼製のベアリングなどでは、この
残留オーステナイトがベアリングなどを使用中に
機械的な応力によつてマルテンサイトに変態し、
製品の寸法精度が低下して騒音などの原因にな
る。このような現象は、焼入れ並びに焼もどし処
理を行なつた鉄鋼材料に対して深冷処理を施して
残留オーステナイトをマルテンサイトに変態させ
ておけば防止される。 However, if shot peening is too weak, it will be ineffective, and if it is too strong, it will cause scratches on the surface of the steel material, which will act as notches.
The wear strength of the steel material is rather lower than before the shot peening treatment. Steel materials that have been quenched and tempered usually retain austenite to varying degrees. In bearings made of steel, this residual austenite transforms into martensite due to mechanical stress while the bearing is in use.
This may reduce the dimensional accuracy of the product and cause noise, etc. Such a phenomenon can be prevented by subjecting the steel material that has been quenched and tempered to deep cooling treatment to transform residual austenite into martensite.
上記深冷処理は、鉄鋼材料製品全体に残留する
オーステナイトをマルテンサイトに変態させるた
めに行なわれるものである。 The deep cooling treatment described above is performed in order to transform austenite remaining in the entire steel material product into martensite.
本発明は、オーステンパー処理を施したオース
テナイトを含有する鉄鋼材料に対して短時間深冷
処理を行ない、該鉄鋼材料の表面層のオーステナ
イトの一部あるいは全体をマルテンサイトに変態
させることにより該鉄鋼材料のつかれ強さを向上
させる技術を提供するものである。 The present invention performs deep cooling treatment on austempered steel material containing austenite for a short time to transform part or all of the austenite in the surface layer of the steel material into martensite. It provides a technology that improves the wear strength of materials.
実施例 １
炭素3.65％、けい素2.51％、マンガン0.45％、
リン0.035％、イオウ0.008％、マグネシウム0.042
％（以上いずれも重量パーセント）を含有する球
状黒鉛鋳鉄製の回転曲げ試験片を900℃に加熱
し、該温度に２時間保持して完全にオーストナイ
ト化させたのち235℃に保持した塩浴中に焼入
れ、２時間保持したのち塩浴から取り出して空冷
した。室温に冷却した該試験片を、−100℃に保持
した液体チツ素とイソペンタンの混合液中に10秒
間浸漬させたのち、取り出し、小野式回転曲げ試
験機を使つて疲労試験を行なつた。第１図中の線
は該球状黒鉛鋳鉄のSN線図であり、線は、
比較のために上記と同様のオーステンパー処理の
みを行ない、深冷処理を施していない上記成分の
球状黒鉛鋳鉄について得たSN線図である。Example 1 Carbon 3.65%, silicon 2.51%, manganese 0.45%,
Phosphorus 0.035%, Sulfur 0.008%, Magnesium 0.042
A rotary bending test piece made of spheroidal graphite cast iron containing 10% (all above weight percentages) was heated to 900°C, held at that temperature for 2 hours to completely austonite, and then held at 235°C in a salt bath. After being quenched inside and kept for 2 hours, it was taken out from the salt bath and cooled in the air. The test piece cooled to room temperature was immersed for 10 seconds in a mixture of liquid nitrogen and isopentane maintained at -100°C, then taken out and subjected to a fatigue test using an Ono rotary bending tester. The line in Figure 1 is the SN diagram of the spheroidal graphite cast iron, and the line is
For comparison, it is an SN diagram obtained for spheroidal graphite cast iron of the above components, which was subjected to only austempering treatment similar to that described above, but not subjected to deep cooling treatment.
第１図はオーステンパー処理に続いて本発明に
係わる短時間の深冷処理を施した球状黒鉛鋳鉄と
オーステンパー処理のみを施した同一成分の球状
黒鉛鋳鉄のSN線図である。
FIG. 1 is an SN diagram of spheroidal graphite cast iron that has been subjected to austempering treatment followed by short-time deep cooling treatment according to the present invention, and spheroidal graphite cast iron that has the same composition and that has been subjected to only austempering treatment.
Claims (1)
ーステナイトなどより成る鋼系材料、あるいはベ
ーナイト、オーステナイト、黒鉛などより成る鋳
鉄継材料を、０℃以下の低温の流体に短時間接触
させることにより表面積のオーステナイトの一部
ないしは全体をマルテンサイトに変態させること
により、そのつかれ強さを向上させることを特徴
とする深冷処理法。1. By bringing an austempered steel material made of bainite, austenite, etc., or a cast iron joint material made of bainite, austenite, graphite, etc. into contact with a low-temperature fluid of 0°C or less for a short time, the surface area of the austenite is reduced. A deep cooling treatment method that improves wear strength by transforming part or the whole into martensite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6711879A JPS55158214A (en) | 1979-05-30 | 1979-05-30 | Sub-zero treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6711879A JPS55158214A (en) | 1979-05-30 | 1979-05-30 | Sub-zero treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55158214A JPS55158214A (en) | 1980-12-09 |
| JPS6112971B2 true JPS6112971B2 (en) | 1986-04-11 |
Family
ID=13335651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6711879A Granted JPS55158214A (en) | 1979-05-30 | 1979-05-30 | Sub-zero treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55158214A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881295A (en) * | 2017-11-18 | 2018-04-06 | 蚌埠中梁机械科技有限公司 | A kind of surface treatment method of cast iron die |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1911854B1 (en) * | 2006-10-12 | 2011-07-13 | Georg Fischer Automotive AG | Removal of lids in surface spherical particles of grey cast workpiece by cryogenic treatment |
-
1979
- 1979-05-30 JP JP6711879A patent/JPS55158214A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881295A (en) * | 2017-11-18 | 2018-04-06 | 蚌埠中梁机械科技有限公司 | A kind of surface treatment method of cast iron die |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55158214A (en) | 1980-12-09 |
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