锻压技术

Mn18Cr18N钢热锻过程中损伤的研究

英文标题：Investigation on Mn18Cr18N steel damage during hot forging

作者：魏新鹏刘建生何文武

关键词：Mn18Cr18N钢热锻损伤

分类号：TG111.91

出版年,卷(期):页码：2010,35(5):11-15

摘要：

通过分析热拉伸中空洞萌生、长大、聚合现象给出了空洞萌生应变和断裂应变的选取方法。采用热拉伸和有限元模拟相结合的方法给出了Mn18Cr18N钢韧性断裂温度区间内损伤临界值。对比热锻物理试验与有限元预报中空洞萌生和断裂发生的时机，结果发现: C+L准则预报结果与热锻试验中损伤的发生具有较高的一致性，而作为对照所选择的R+T准则对损伤过程的预报与试验结果偏差较大。

Cavity initiation, growth and coalescence phenomena during the hot tension testing were established to obtain the selection method of cavity initiation strain and fracture strain. The FEM analyses and uniaxial hot tension tests were used to obtain the threshold of the damage of Mn18Cr18N steel in high temperature ductile region. The cavity initiation and the opportunity of fracture in the hot forging and the FEM prediction were compared .The results show that C+L gives moderately good correlation between the hot forging testing and the forecast result. An alternate comparison based on the R+T model tends to overestimate the incidence of damage.

基金项目：

国家自然科学基金资助项目（50675146）；十一五支撑计划项目（2007BAF02B07）

参考文献：

［1］陈慧琴,刘建生,郭会光. 氮对Mnl8Crl8N护环钢高温力学性能的影响[J]. 特殊钢,2005, 26（6）：20-22.
［2］张进,李静媛,王一德,等. Mn18Cr18高氮钢热加工工艺的研究[J]. 锻压技术,2009,34（1）:10-13.
［3］Cockcroft M G, Latham D J. NEL report [R]. No. 240, National Engineering Laboratory, 1966.
［4］Brozzo P, Deluca B, Rendina R. A new method for the prediction of formability limit in metal sheets, sheetmetal forming and formability[A]. Nicolaou P D. Proceedings of the Seventh Biennial Conference of the International Deep Drawing Research Group[C]. Amsterdam, Netherlands, 1986.
［5］Freudenthal F A. The inelastic behaviors of solid[M]. New York: Wiley, 1950．
［6］Rice J R, Tracey D M. On the ductile enlargement of voids in triaxial stress fields[J]. Meeh. Phys. Soids., 1969，4(17)：201-207.
［7］Pardoen T, Doghri I, Delannay F. Analysis of the cupcone fracture in a round tensile bar[J]. Acta.Mater., 1998, 6(46): 541-552.
［8］余寿文, 冯西桥. 损伤力学[M]. 北京：清华大学出版社, 1997.
［9］Semiatin S L, Goetz R L, Shell E B, et al. Cavitation and failure during hot forging of Ti-6Al-4V[J]. Metallurgical and Materials Transactions, 1999, 30(A): 1421-1422.
［10］Semiatin S L, Seetharaman V, Ghosh A K, et al. Cavitation during hot tension testing of Ti-6Al-4V [J]. Materials Science and Engineering, 1998, 256 (A): 92-110.
［11］Goods S H, Nix W D. The kinetics of cavity growth and creep fracture in silver containing implanted grain boundary cavities[J]. Acta Metallurgica, 1978, 5(26): 739-752.
［12］郑长卿, 周利. 金属韧性破坏的细观力学及其应用研究[M]. 北京：国防工业出版社，1995.

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