蔺永诚,陈明松,钟掘

• 1:中南大学机电工程学院
• 2:现代复杂装备设计与极端制造教育部重点实验室
• 3:中南大学机电工程学院现
• 4:代复杂装备设计与极端制造教育部重点实验室

摘要(Abstract)：

以热物理模拟试验为基础,得到42CrMo钢发生动态再结晶的数学模型。采用热-力耦合的弹塑性有限元法对42CrMo钢圆柱试样的热变形过程进行了数值模拟,讨论了形变温度对42CrMo钢塑性成形与动态再结晶的影响。模拟结果表明,热变形过程中,试样各部位变形不均,心部的等效应变最大,变形不均匀性在950℃附近达到最大值;试样各部位的等效应力大小分布不均,其最大值在低温时一般出现在心部与粘着区/自由变形区的交界处,高温时一般出现在粘着区;动态再结晶分数随着形变温度升高而增大,当形变温度较低、压下量较大时也会发生较大程度的动态再结晶;试样各部位的动态再结晶晶粒大小分步不均,再结晶晶粒随形变温度升高而迅速粗化。

关键词(KeyWords)： 42CrMo钢;动态再结晶;数值模拟;晶粒尺寸

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展规划资助项目(2006CB705401);; 中国博士后科学基金资助项目(20070410302);; 中南大学博士后基金(2007);; 国家自然科学基金(50805147)

作者(Author): 蔺永诚,陈明松,钟掘

参考文献(References)：

• [1]Poelt P,Sommitsch C,Mitsche S,et al.Dynamic recrystallization of Ni-base alloys-Experimental results and comparisons with simulations[J].MaterialsScience and Engineering A,2006,420(1-2):306-314.
• [2]Jeong H S,Cho J R,Park H C.Microstructure prediction of nimonic 80A for large exhaust valve during hot closed die forging[J].Journal of MaterialsProcessing Technology,2005,162-163:504-511.
• [3]张斌,李波,张鸿冰.35CrMo钢动态再结晶过程数值模拟与试验研究[J].锻压技术,2004,29(6):36-39.ZHANG Bin,LI Bo,ZHANG Hong-bing.Value simulation and experiment study of dynamic re-crystal process of 35CrMo steel[J].Forging&StampingTechnology,2004,29(6):36-39.
• [4]刘建涛,张义文,陶宇,等.FGH96合金动态再结晶行为的研究[J].材料热处理学报,2006,27(5):46-50.LIU Jian-tao,ZHANG Yi-wen,TAO Yu,et al.Investigation on dynamic recrystallization of FGH96 powder metallurgy superalloy[J].Transactions ofMaterials and Heat Treatment,2006,27(5):46-50.
• [5]沙桂英,徐永波,于涛,等.AZ91镁合金的动态应力-应变行为及其应变率效应[J].材料热处理学报,2006,27(4):77-81.SHA Gui-ying,XU Yong-bo,YU Tao,et al.Dynamic stress-strain behavior of AZ91 magnesium alloy and its dependence on strain rate[J].Transactions ofMaterials and Heat Treatment,2006,27(4):77-81.
• [6]刘建生,王仲仁,卢志永.曲轴RR镦锻成形的数值模拟与缺陷预测[J].中国机械工程,2001,12(4):429-432.LIU Jian-sheng,WANG Zhong-ren,LU Zhi-yong.Numerical simulation and defect prediction of RR upsetting process of crankshaft[J].MechanicalEngineering of China,2001,12(4):429-432.
• [7]黄劲松,黄岚,张永红,等.热处理工艺对Ti-45Al-7Nb-0.15B-0.7W合金微观组织的影响[J].材料热处理学报,2006,27(6):78-83.HUANG Jin-song,HUANG Lan,ZHANG Yong-hong,et al.Effect of heat treatment on microstructure of Ti-45Al-7Nb-0.15B-0.7W alloy[J].Transactionsof Materials and Heat Treatment,2006,27(6):78-83.
• [8]LI X T,WANG M T,DU F S.The coupling thermal-mechanical and microstructural model for the FEM simulation of cross wedge rolling[J].Journal ofMaterials Processing Technology,2006,172(2):202-207.
• [9]Cho J R,Jeong H S,Cha D J,et al.Prediction of microstructural evolution and recrystallization behaviors of a hot working die steel by FEM[J].Journal ofMaterials Processing Technology,2005,160(1):1-8.
• [10]Celik A,Karadeniz S.Improvement of the fatigue strength of AISI 4140 steel by an ion nitriding process[J].Surface Coating Technology,1995,72(3)169-173.
• [11]赵莉萍,刘宗昌,杨慧,等.42CrMo钢的贝氏体组织相变[J].特殊钢,2004,25(4):21-23.ZHAO Li-ping,LIU Zhong-chang,YANG Hui,et al.Transformation of bainitic structure of steel 42CrMo[J].Special Steel,2004,25(4):21-23.
• [12]王毛球,董瀚,惠卫军,等.热处理对42CrMo钢的耐延迟断裂性能的影响[J].金属学报,2002,38(7):715-719.WANG Mao-qiu,DONG Han,HUI Wei-jun,et al.Effect of heat treatment on delayed fracture resistance of structural steel 42CrMo[J].Acta MetalluragicaSinica,2002,38(7):715-719.
• [13]LIN Y C,CHEN Ming-song,ZHONG Jue.Constitutive modeling for elevated temperature flow behavior of 42CrMo steel[J].Computational MaterialsScience,2008,42(3):470-477.
• [14]LIN Y C,CHEN Ming-song,ZHONG Jue.Prediction of 42CrMo steel flow stress at high temperature and strain rate[J].Mechanics ResearchCommunications,2008,35(3):142-150.

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