喷射成形GH742y合金晶粒长大规律的研究  

Evaluation of Grain Growth of Spray Formed Superalloy GH742y

作　　者：许文勇[1] 李周[1] 张国庆[1] 袁华[1] 李正栋[1] 姚瑞平[1] 田世藩[1] 徐石斌[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2006年第3期52-55,共4页Journal of Aeronautical Materials

基　　金：航空科学基金(03H21002)

摘　　要：研究了不同固溶温度热处理对氮气雾化喷射成形GH742y合金相组成和晶粒尺寸的影响,并重点分析了第二相对晶粒长大的抑制作用。结果表明:氮气雾化喷射成形GH742y合金具有良好的高温抗晶粒长大特性,极限晶粒尺寸约为40μm;γ′相固溶温度约为1127℃;高于γ′相固溶温度热处理时,弥散分布MC型碳氮化合物阻碍晶粒长大;G ladm an方程可以估计氮气雾化沉积坯的极限晶粒尺寸。The influence of solution temperature on the phase structure and grain size of spray forming GH742y N_2-atomized has been investigated,and,the inhibited effects of the second phase on grain growth have also been studied.The results indicate very little coarsening and good stability of grains in GH742y alloy spray formed by nitrogen atomization.The limiting ultimate grain size of the as spray formed and HIPed alloy was about 40μm.The γ′ solvus temperature of spray formed GH742y has determined to be about 112...

关 键 词：喷射成形 晶粒长大 GH742y 碳氮化合物 

分 类 号：TG111.8[金属学及工艺—物理冶金]