一种镍钴基高温合金热变形行为研究  

Study on hot deformation behavior of a Ni-Co-based superalloy

作　　者：朱强 张自昂[1,2] 张林福 张鹏 Zhu Qiang;Zhang Ziang;Zhang Linfu;Zhang Peng(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China;School of Materials Science and Engineering,Harbin Institute of Technology,Weihai,Weihai 264209,China)

机构地区：[1]哈尔滨工业大学金属精密热加工国防科技重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海)材料科学与工程学院,山东威海264209

出　　处：《锻压技术》2024年第7期57-63,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52175306)。

摘　　要：利用热模拟试验机对均匀化热处理后的镍钴基高温合金进行了高温压缩试验,基于试验结果对不同变形温度和应变速率下合金的流变行为展开了研究,建立了镍钴基高温合金的热压缩本构方程及热加工图,利用电子背散射衍射(Electron Back-Scattered Diffraction,EBSD)技术对热压缩变形后微观组织进行了分析。研究结果表明:镍钴基高温合金流变应力随着变形温度的降低和应变速率的增加而逐渐增加。在所研究的变形温度区间及应变速率条件下,合金均未发生失稳现象(失稳因子均大于0)。合金的再结晶分数随着功率耗散率的增加而增加,且显著受温度影响。Hot compression tests were conducted on Ni-Co-based superalloy after homogenizing heat treatment by thermal simulation test machine,and based on the test results,the rheology behavior of the alloy under different deformation temperatures and strain rates was investigated.Then,the constitutive equation and hot processing maps for hot compression of Ni-Co-based superalloy were established,and the microstructure after hot compression deformation was analyzed by the electron back-scattered diffraction technique.The research esults show that the rheology stress of Ni-Co-based superalloy increases with the decreasing of deformation temperature and the increasing of strain rate.Within the investigated deformation temperature range and strain rate conditions in this study,no instability phenomena occurs in the alloy(instability factor is greater than 0).The recrystallization fraction of the alloy increases with the increasing of power dissipation rate,and it is significantly affected by temperature.

关 键 词：镍钴基高温合金 热压缩 本构方程 热加工图 动态再结晶 

分 类 号：TG132.3[一般工业技术—材料科学与工程]