碳元素对一种高温合金组织和性能的影响  

Effect of Carbon on Microstructure and Properties of a Superalloy

作　　者：刘英浩 肖旋[1] 刘梓童 王婷婷 LIU Yinghao;XIAO Xuan;LIU Zitong;WANG Tingting(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2022年第2期59-64,81,共7页Journal of Shenyang Ligong University

摘　　要：采用扫描电子显微镜(SEM)与电子背散射衍射技术(EBSD)对新型Fe-Ni-Cr基变形高温合金的热轧态与固溶处理态的显微组织进行表征,分析碳含量对该合金750℃高温拉伸性能的影响。结果表明:在热轧制变形过程中,材料内析出富Nb的MC型碳化物和富Cr的M_(23)C_(6)型碳化物;随着碳含量的提高,碳化物的尺寸与数量增大,材料的晶粒尺寸减小,大角度界面与孪晶界的数量增大;对热轧后的材料进行固溶处理时,其显微组织遗传了热轧态组织的特征,MC型和M_(23)C_(6)型碳化物可有效钉扎晶界,抑制晶粒在固溶处理过程中的粗化长大;随着碳含量的提高,材料750℃高温拉伸强度与塑性得到同步提升。Scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD)were used to characterize the microstructure of a new Fe-Ni-Cr based deformed superalloy as hot rolled and solution treated.The effect of carbon content on the tensile properties of the alloy at 750℃was analyzed.The results show that Nb rich MC carbides and Cr rich M_(23)C_(6)carbides precipitate in the material during hot rolling deformation;With the increase of carbon content,the size and quantity of carbides increase,the grain size decreases,and the number of large angle interface and twin boundary increases;When the hot-rolled material is treated by solution,its microstructure inherits the characteristics of hot-rolled microstructure.MC and M_(23)C_(6)carbides can effectively nail the grain boundary and inhibit the coarsening and growth of grains during solution treatment;With the increase of carbon content,the tensile strength and plasticity at 750℃are improved simultaneously.

关 键 词：高温合金 碳化物 晶粒尺寸 特殊晶界 拉伸性能 

分 类 号：TG141[一般工业技术—材料科学与工程]