刘延辉,姚泽坤,宁永权,杨国宝,南洋

• 1:西北工业大学材料科学与工程学院

摘要(Abstract)：

在Gleeble-1500D热模拟机上对粉末冶金高速钢进行了变形温度为1000~1150℃、应变速率为0.001~1.0 s-1;最大变形量为60%的等温热模拟压缩变形实验,并对不同变形温度和变形速率下变形试样进行了微观组织变化的观察。结果表明:流变应力和微观组织受变形温度和应变速率的影响显著,流变应力随变形温度的升高和应变速率的降低而降低,且流变应力在经历加工硬化阶段后均表现出加工软化,最后出现稳态流动特征。随着应变速率的减小,局部塑性流动减弱,回复与动态再结晶进行较充分,碳化物分布趋于均匀;随着变形温度的升高,扩散和动态再结晶更容易,发生连续的再结晶,晶粒容易长大粗化。综合考虑材料的微观组织和热加工图,最佳的热加工变形温度为1050~1100℃和应变速率为0.1~0.01 s-1。

关键词(KeyWords)： 粉末冶金高速钢;高温变形;流变应力;显微组织;加工图

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51175431,51101119);; 中国博士后科学基金(2012T50818)

作者(Author): 刘延辉,姚泽坤,宁永权,杨国宝,南洋

DOI: 10.13289/j.issn.1009-6264.2014.04.012

参考文献(References)：

• [1]Wiebner M,Leisch M,Emminger H,et al.Phase transformation study of a high speed steel powder by high temperature X-ray diffraction[J].Materials Characterization,2008,59(7):937-943.
• [2]Yan L C,Lu G F,Meng L B,et al.Research on microstructure and properties of powder metallurgy high speed steel[J].Powder Metallurgy Industry,2011,21(3):1-5.
• [3]Pellizzari M,Fedrizzi A,Zadra M,Influence of processing parameters and particle size on the properties of hot work and high speed toolsteels by spark plasma sintering[J].Mater and Design,2011,32(4):1796-1805.
• [4]Berkowski L.The influence of warm plastic deformation on the structure and on the applicable properties of high speed steel[J].Journal of Materials Processing Technology,1996,60(1-4):637-641.
• [5]董海峰,蔡大勇,王玉辉,等.Cr微合金化低碳钢热变形行为[J].材料热处理学报,2009,30(6):47-50.DONG Hai-feng,CAI Da-yong,WANG Yu-hui,el at.Hot deformation behavior of Cr micro-alloyed low carbon steel[J].Transaction of Materials and Heat Treatment,2009,30(6):47-50.
• [6]彭益群.热变形参数对Ti-10V-2Fe-3Al合金组织与流变应力的影响研究[D].北京:北京航空航天大学,1989.PENG Yu-qun.Research on the effects of hot deformation parameters on microstructures and flow stress of Ti-10V-2Fe-3Al alloy[D].Beijing:Beijing space and Aeronautic University,1989.
• [7]毛卫民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994.
• [8]刘楚明,刘子娟,朱秀荣,等.镁及镁合金动态再结晶研究进展[J].中国有色金属学报,2006,16(1):1-12.LIU Chu-ming,LIU Zi-juan,ZHU Xiu-rong,et al.Research and development progress of dynamic recrystallization in pure magnesium and its alloys[J].The Chinese Journal of Nonferrous Metals,2006,16(1):1-12.
• [9]逯允海,付瑞东,邱亮,等.氮强化高猛奥氏体钢热变形行为研究[J].材料热处理学报,2007,28(2):69-72.LU Yun-hai,FU Rui-dong,QIU Liang,el at.Deformation behavior of nitrogen strengthened high manganese austenitic steel[J].Transaction of Materials and Heat Treatment,2007,28(2):69-72.
• [10]叶文君,脱祥明,王世洪.β21S钛合金热压缩变形行为[J].稀有金属,2002,26(1):23-27.YE Wen-jun,TUO Xiang-ming,WANG Shi-hong.High temperature deformation behavior ofβ21S titanium alloy[J].Rare Metals,2002,26(1):23-27.
• [11]Vop,Jahazi M,Yue S,et al.Flow stress prediction during hot working of nearαtitanium alloys[J].Materials Science and Engineering A,2007,477(1-2):99-110.
• [12]李红英,巫荣海,魏冬冬,等.T23钢的热变形行为[J].材料热处理学报,2013,34(1):96-101.LI Hong-ying,WU Rong-hai,WEI Dong-dong,el at.Thermal deformation behavior of T23 steel[J].Transaction of Materials and Heat Treatment.2013,34(1):96-101.
• [13]Momeni A,Abbasi S M.Effect of hot working on flow behavior of Ti-6Al-4V alloy in single phase and two phase regions[J].Materials and Design,2010,31(8):3599-3604.
• [14]孔凡涛,张树志,陈玉勇.Ti-46Al-2Cr-4Nb-Y合金的高温变形及加工图[J].中国有色金属学报,2006,20(1):233-236.KONG Fan-tao,ZHANG Shu-zhi,CHEN Yu-yong.Hot deformation and processing map of Ti-46Al-2Cr-4Nb-Y alloy[J].The Chinese Journal of Nonferrous Metals,2006,20(1):233-236.

文章评论(Comment)：