11Cr铁素体/马氏体钢高温拉伸时的锯齿流变现象
Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension
摘 要
在应变速率为2×10-5～1×10-3s-1范围内以及不同温度(600～700 ℃)下, 对11Cr铁素体/马氏体钢进行拉伸试验, 研究其在变形过程中的锯齿流变现象。结果表明: 试验钢在变形过程中出现了“反常”锯齿流变, 且只出现一种E型锯齿波; 锯齿开始出现在拉伸应力最大值附近, 锯齿波主要处于拉伸曲线的下降段; 锯齿形成的有效激活能约为43.44 kJ·mol-1; 高温时, 置换原子气团能量高, 完全钉扎住位错, 当一定数量的位错达到临界运动速度时, 摆脱了置换原子气团的钉扎, 从而导致产生锯齿流变现象。
动态应变时效
锯齿流变
激活能
高温
11Cr ferritic/martensitic steel
dynamic strain aging
serrated flow
activation energy
high temperature
Abstract
Tensile test was performed on 11 Cr ferritic/martensitic steel at different temperatures (600-700 ℃) and strain rates of 2×10-5-1×10-3 s-1, and serrated flow during deformation was studied. The results show that "abnormal" serrated flow was found during tested steel deformation and only type E serrated wave exhibited. Serration behavior began to appear near the maximum tensile strength and serrated waves mainly lied in descending part of stress-strain curves. The effective activation energy for forming serration was 43.44 kJ·mol-1. At high temperature, the energy of substitutional atoms was high and could pin dislocations completely, and when a certain amount of dislocations up to a critical velocity and break free of pinning of substitutional atoms, the serrated flow appeared.
中图分类号 TL341
所属栏目 新材料 新工艺
基金项目 国家自然科学基金重点资助项目(51034011)
收稿日期 2013/3/6
修改稿日期 2014/3/3
网络出版日期
作者单位点击查看
备注季波(1986-), 男, 江苏淮安人, 硕士研究生。
引用该论文: JI Bo,SHEN Yin-zhong,HUANG Xi. Serrated Flow of 11 Cr Ferritic/Martensitic Steel during High Temperature Tension[J]. Materials for mechancial engineering, 2014, 38(5): 33～36
季波,沈寅忠,黄希. 11Cr铁素体/马氏体钢高温拉伸时的锯齿流变现象[J]. 机械工程材料, 2014, 38(5): 33～36
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【3】DEHGHANI K, JONAS J J. Dynamic bake hardening of interstitial-free steels［J］.Metallurgical and Materials Transactions A,2000,31(5): 1375-1384.
【4】MESAROVIC S D. Dynamic strain aging and plastic instabilities［J］.Journal of the Mechanics and Physics of Solids,1995,43(5):671-700.
【5】彭开萍,陈文哲,钱匡武 3004铝合金的拉伸变形特征［J］.机械工程材料,2005,29(12):13-16.
【6】王刚,李志刚,韩鹏程,等.304奥氏体不锈钢高温拉伸变形时的锯齿流变行为［J］.机械工程材料,2012,36(6):64-67.
【7】KIM I S, KANG S S. Dynamic strain aging in SA508-class 3 pressure vessel steel［J］.International Journal of Pressure Vessels and Piping,1995,62(2):123-129.
【8】WAGNER D, MORENO J C, PRIOUL C, et al. Influence of dynamic strain aging on the ductile tearing of C-Mn steels: modelling by a local approach method［J］.Journal of Nuclear Materials,2002,300(2):178-191.
【9】NORTMANN A, SCHWINK C. Characteristics of dynamic strain ageing in binary fcc copper alloys-part I: results on solid solutions of CuAl［J］.Acta Materialia,1997,45(5):2043-2050.
【10】TIAN B. Ageing effect on serrated flow in Al-Mg alloys［J］.Materials Science and Engineering: A,2003,349(1):272-278.
【11】BALIK J, LUKAC P, KUBIN L P. Inverse critical strains for jerky flow in Al-Mg alloys［J］.Scripta Materialia,2000,42(5):465-471.
【12】WAS G S, AMPORNRAT P, GUPTA G, et al. Corrosion and stress corrosion cracking in supercritical water［J］.Journal of Nuclear Materials,2007,371(123):176.
【13】MASUYAMA F. New developments in steels for power generation boilers［C］// Advanced Heat Resistant Steels for Power Generation.London:The Institute of Materials,1999:33-48.
【14】VISWANATHAN R, BAKKER W. Materials for ultrasupercritical coal power plants-boiler materials: part 1［J］.Journal of Materials Engineering and Performance,2001,10:81-95.
【15】VISWANATHAN R, BAKKER W. Materials for ultrasupercritical coal power plants-turbine materials: part 2［J］.Journal of Materials Engineering and Performance,2001,10:96-101.
【16】KELLER C, MARGULIES M M, GUILLOT I. Experimental analysis of the dynamic strain ageing for a modified T91 martensitic steel［J］.Materials Science and Engineering: A,2012,536:273-275.
【17】ROY A K, KUMAR P, MAITRA D. Dynamic strain ageing of P91 grade steels of varied silicon content［J］.Materials Science and Engineering: A,2009,499(1):379-386.
【18】RODRIGUEZ P. Serrated plastic flow［J］.Bulletin of Materials Science,1984,6(4):653-663.
【19】MCCORMICK P G. A model for the Portevin-Le Chatelier effect in substitutional alloys［J］.Acta Metallurgica,1972,20(3):351-354.
【20】GUPTA C, CHAKRAVARTTY J K, WADEKAR S L, et al. Effect of serrated flow on deformation behaviour of AISI 403 stainless steel［J］.Materials Science and Engineering: A,2000,292(1):49-55.
【21】CHAENOCK W. The initiation of serrated yielding at eleva-ted temperatures［J］.Philosophical Magazine,1969,164(20):427-432.
【22】LIU Lin-fei, ZHOU Shang-qi, HUANG Yu-tang, et al. Computation of diffusion activation energies of C, N and O in α-Fe ［J］.Materials Review,2008,22(8):120-122.
【23】OIKAWA H. Review of lattice diffusion of substitutional impurities in iron［J］.Technol Rep Tohoku Univ,1982,47(2):215-224.
【24】BALLUFFI R W. On measurements of self-diffusion rates along dislocations in FCC metals［J］.Physica Status Solidi:b,1970,42(1):11-34.
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