GH738合金双锥试样热压缩行为  

Hot compression behaviors of double cone samples of GH738 alloy

作　　者：陈舒恬[1,2] 王珏[1,2] 胡定祥[2] 

机构地区：[1]江苏省先进结构材料与应用技术重点实验室,江苏南京211167 [2]南京工程学院材料工程学院,江苏南京211167

出　　处：《材料热处理学报》2016年第12期80-85,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金青年科学基金项目(No.51301085);南京工程学院引进人才科研启动基金项目(No.YKJ201306)

摘　　要：利用双锥试样热压缩实验研究了GH738合金的动态再结晶行为,通过有限元软件计算得到样品纵剖面应变和温度的定量分布规律,进而构建合金动态再结晶的动力学曲线,并分析了热压缩温度对再结晶动力学的影响规律。结果表明:将双锥试样压缩至高12 mm时,其纵剖面中心线位置的真应变量呈对称分布且连续变化,边缘最低应变量为0.47,心部应变量峰值为2.61,该区域温度基本保持稳定;动态再结晶比例随真应变呈"S"形曲线变化,随着预热温度的降低,再结晶形核所需应变量增大,晶粒尺寸减小,但完成再结晶所需应变量无明显变化。Dynamic recrystallization（DRX） behaviors of GH738 alloy were studied by hot compression test with double cone samples.Combined with the quantitative distribution of strain and temperature in vertical section,which were calculated by finite element method software,kinetic curves of DRX of the alloy were constructed. The effect of deformation temperature on DRX kinetics was analyzed. The results show that when samples are compressed to the height of 12 mm,symmetrical and continuous strain is observed along the center line in the vertical section,with the lowest value of 0. 47 at the edge and the highest value of 2. 61 in the center. In contrast,temperature remained stable in this area. An ＂S＂type curve is obtained for the relationship between DRX fraction and strain values. At lower preheating temperatures,the nucleation of DRX is retarded and the grain size is finer. However,the completion strain for DRX has no significant change.

关 键 词：双锥试样 动态再结晶 动力学 GH738合金 

分 类 号：TG132.3[一般工业技术—材料科学与工程]