应变速率对铸态低镍奥氏体不锈钢热塑性的影响
Effect of Strain Rate on Hot Ductility of Cast Low Ni Austenitic Stainless Steel
摘 要
通过高温拉伸试验研究了应变速率对Cr15Mn9Cu2NiN和Cr17Mn6Ni4Cu2N两种铸态奥氏体不锈钢热塑性的影响。结果表明: Cr15Mn9Cu2NiN钢的显微组织为单一奥氏体, 而Cr17Mn6Ni4Cu2N钢中有残留δ铁素体分布在奥氏体晶界和晶粒内部; 将应变速率由0.1 s-1升高至10 s-1后, 变形时奥氏体晶界处增加的应力集中的作用与减少晶界滑移的作用相抵消, 因此对Cr15Mn9Cu2NiN钢的热塑性无明显影响; 但Cr17Mn6Ni4Cu2N钢的显微组织中存在较多的奥氏体/铁素体相界, 这些相界在高应变速率时会变成位错源迅速产生大量的位错, 从而提高奥氏体和铁素体强度, 降低铁素体处的应力集中作用, 使其断面收缩率提高10%以上。
应变速率
热塑性
δ铁素体
austenitic stainless steel
strain rate
hot ductility
δ ferrite
Abstract
The influence of strain rate on the hot ductility of two kinds of cast austenitic stainless steels, Cr15Mn9Cu2NiN and Cr17Mn6Ni4Cu2N, has been studied in high temperature tensile tests. Results show that the microstructure of Cr15Mn9Cu2NiN steel was fully austenite, but residual δ ferrites distributed in the boundaries and inside of austenite grains in Cr17Mn6Ni4Cu2N steel. There was little influence on the hot ductility of Cr15Mn9Cu2NiN steel as increasing strain rate from 0.1 s-1 to 10 s-1, because the increased stress concentration on grain boundary was eliminated by the reducing of grain boundary sliding when increasing the strain rate. In the microstructure of Cr17Mn6Ni4Cu2N steel there was lots of interface between austenite and ferrite phase which generated dislocations as the materials deformed at higher strain rate, improving the strength of austenite and ferrite, then decreasing the stress concentration on ferrite, so the reduction of area was increased by more than 10%.
中图分类号 TG142.7
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51264026)
收稿日期 2012/12/5
修改稿日期 2013/11/25
网络出版日期
作者单位点击查看
备注侯国清(1982-), 男, 河北沧州人, 博士研究生。
引用该论文: HOU Guo-qing,ZHU Liang,TIAN Yan-long,BIAN Hong-xia. Effect of Strain Rate on Hot Ductility of Cast Low Ni Austenitic Stainless Steel[J]. Materials for mechancial engineering, 2014, 38(2): 19～23
侯国清,朱亮,田彦龙,边红霞. 应变速率对铸态低镍奥氏体不锈钢热塑性的影响[J]. 机械工程材料, 2014, 38(2): 19～23
被引情况:
【1】肖强, "2Cr18Ni8W2不锈钢圆棒精锻过程的有限元模拟",机械工程材料 40, 71-74(2016)
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参考文献
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【2】钟政烨, 盛光敏. 200系奥氏体不锈钢热轧裂纹的产生原因及其工艺改进［J］.机械工程材料,2010,34(4):79-83.
【3】MINTZ B, COWLEY A, ABUSHUSHA R. Hot ductility curve of an austenitic stainless steel and importance of dynamic recrystallization in determining ductility recovery at high temperature［J］.Materials Science and Technology,1999,15(10):1179-1185.
【4】MCQUEEN H J. Elevated-temperature deformation at forming rates of 10-2 to 102 s-1［J］.Metallurgical and Materials Transactions: A,2002,33(2):345-360.
【5】MINTA B, SHAKER M, CROWTHER D N. Hot ductility of an austenitic and a ferritic stainless steel［J］.Materials Science and Technology,1997,13(3):243-249.
【6】SIMON G, SERGIU I, CECILIA P, et al. Influence of strain rate on hot ductility of a V-microalloyed steel slab［J］.Steel Research International,2012,83(5):445-455.
【7】BYUN J, SUK K, SEO S C. Effects of strain rate and remelting on hot ductility of continuous casting slab［J］.Journal of the Korean Institute of Metals and Materials,2005,43(3):188-194.
【8】RYAN N D, MCQUEEN H J. Comparison of dynamic softening in 301, 304, 316 and 317 stainless steels［J］.High Temperature Technology,1990,8(3):185-200.
【9】RYAN N D, MCQUEEN H J, JONAS J J. The deformation behavior of types 304, 316, and 317 austenitic stainless steels during hot torsion［J］.Canadian Metallurgical Quarterly,1983,22(3):369-378.
【10】TAN S P, WANG Z H, CHENG S C, Processing maps and hot workability of Super304H austenitic heat-resistant stainless steel［J］.Materials Science and Engineering:A,2009,517(1/2):312-315.
【11】MCQUEEN H J, YUE S, RYAN N D, et al. Hot working characteristics of steels in austenitic state［J］.Journal of Materials Processing Technology,1995,53:293-310.
【12】BILMES P, GONZALES A, LLORENT A, et al. Effect of δ ferrite solidification morphology of austenitic stainless steel weld metal on properties of welded joints［J］.Welding International,1996,10(10):797-808.
【13】SCHINO A D, KENNY J M, MECOZZI M G. Development of high nitrogen-low nickel-18%Cr austenitic stainless steels［J］.Journal of Materials Science,2000,35(19):4803-4808.
【14】TARBOTON J N, MATTHEWS L M, SUTCLIFFE A. The hot workability of Cromanite, a high nitrogen austenitic stainless steel［J］.Materials Science Forum,1999,318/320:777-784.
【15】CZERWINSKI F, CHO J Y. The edge-cracking of AISI 304 stainless steel during hot-rolling［J］.Journal of Materials Science,1999,34(19):4727-4735.
【16】BEVIS H. Deformation substructure and recrystallization［J］.Materials Science Forum,2007,558/559:13-22.
【17】MARTIN C M, ERIC R N, ELLIOT L B, et al. Hot working and recrystallization of as-cast 316L［J］.Metallurgical and Materials Transactions: A,2003,34(8):1683-1703.
【18】侯国清,朱亮,马蓉. 奥氏体不锈钢 Cr15Mn9Cu2Ni1N 连铸坯壳层的热塑性［J］.材料科学与工艺,2011,19(1):91-94.
【19】朱亮,张孝平, 侯国清.Cr15Mn9Cu2Ni1N奥氏体不锈钢的热变形本构特性［J］.塑性工程学报,2009,16(5):96-100.
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