金属学报  1996, Vol. 32 Issue (8): 834-838

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20CrMo钢中的Cottrell气团及其对初始屈服抗力和疲劳门槛值的影响

骆竞晞;仝明信

西安交通大学金属材料强度国家重点实验室

EFFECTS OF COTTRELL ATMOSPHERE ON INITIAL YIELD STRESS AND FATIGUE THRESHOLD OF STEEL 20CrMO

LUO Jingxi; TONG Mingxin(State Key Laboratory for Mechanical Behaviour of Materials; Xi'an Jiaotong University; Xi'an 710049)(Manuscript received 1995-10-20; in revised form 1996-02-02)

骆竞晞;仝明信. 20CrMo钢中的Cottrell气团及其对初始屈服抗力和疲劳门槛值的影响[J]. 金属学报, 1996, 32(8): 834-838.
, . EFFECTS OF COTTRELL ATMOSPHERE ON INITIAL YIELD STRESS AND FATIGUE THRESHOLD OF STEEL 20CrMO[J]. Acta Metall Sin, 1996, 32(8): 834-838.

摘要 参考文献 相关文章 Metrics 全文: PDF(375 KB)   摘要: ２０ＣｒＭｏ钢淬火后，在６００，４５０和２００℃回火，可以得到有上、下屈服点，没有上屈服点只有屈服平台及没有物理屈服现象等３种屈服曲线．本文通过对此３种材料施以不同预变形，研究了Ｃｏｔｔｒｅｌｌ气团对初始屈服抗力σ_０和疲劳门槛值△Ｋ_（ｔｈ）的影响．研究发现：在低温回火状态下，没有物理屈服现象，仍然存在Ｃｏｔｔｒｅｌｌ气团，但间隙原子在位错上的钉扎作用比中、高温回火的要弱．在间隙原子脱钉及Ｃｏｔｔｒｅｌｌ气团消失的同时，σ_０和△Ｋ_（ｔｈ）都大幅度下降．实验结果表明，△Ｋ_（ｔｈ）和σ_０之间存在着良好的线性关系． 关键词 ： Ｃｏｔｔｒｅｌｌ气团,  初始屈服抗力,  疲劳门槛值,  ２０ＣｒＭｏ钢     Abstract：There are three types of yielding curves for steel 20CrMo tempered at 600, 450 and 200℃ after quanching, in which the first has upper and lower yield point, the second has yielding plateau but no upper yield point and the third is a continuous yielding. This paper studied the effects of Cottrell atmosphere on initial yield stress σ0(σ0.001) and fatigue threshold value △Ktn．The results show that, the Cottrell atmosphere still exists in the continuousyielding materials tempered at low temperature, yet the pinning strength of interstitial atoms on dislocations is weeker than that of the materials tempered at middle or high temperature.Both of σ0 and △Ktn is dropped greatly when depinning of interstitial atoms takes place.There is a good linear relation between △Ktn and σ0. Correspondent: LUO Jingxi,(State Key Laboratory for Mechanical Behaviour of Materials, Xi'an JiaotongUniversity, Xi'an 710049) Key words： Cottrell atmosphere    initial yield stress    fatigue threshold value    steel 20CrMo 收稿日期: 1996-08-18      基金资助:中国石油天然气总公司资助项目 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 骆竞晞 仝明信 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1996/V32/I8/834 1CottrellAH．TheRelationBetweentheStructureandMechanicalPropertiesofMetals．2nded,London:HerMajesty′sStationeryOffice,1963:4562LuoJingxi,TanYuxu．ActaMetallSin(EngLett),1995;8:1953LuoJingxi,TanYuxu．ActaMetallSin(EngLett),tobepublishedAlCottrellAH．TheRelationBetweentheStructureandMechanicalPropertiesofMetals．2nded,London:HerMajesty′sStationeryOffice,1963:456A2SnockJL,Physica,1941;8:711A3SnockG,SeegerA．ActaMetall,1959;7:469 [1] 李维娟, 张恒毅, 付豪, 张建平, 戚翔宇. 低碳钢烘烤硬化机制的内耗研究[J]. 金属学报, 2015, 51(4): 385-392. [2] 朱明亮 轩福贞 朱奎龙 王国珍 贾天耀. 热处理对25Cr2NiMo1V钢疲劳特性的影响[J]. 金属学报, 2009, 45(3): 320-325. [3] 吴敏;徐约黄;沈功田. 时效对LC9铝合金锯齿流变的影响[J]. 金属学报, 1991, 27(5): 33-38. Viewed Full text Abstract Cited   Shared      Discussed