摘要
借助于Thermal-calc热力学软件计算了合金的平衡凝固相图,以此为依据制定了高温扩散退火处理的试验参数。利用OM和SEM观察了GH4738合金的铸态偏析状况,并用EPMA技术研究了合金铸态以及不同高温扩散退火制度下的元素偏析规律。结果表明,铸态合金中Ti元素偏析最为严重,高温扩散退火处理后Ti元素偏析得到明显改善,经1200℃×50 h的高温处理后效果最为显著,同时计算了残余偏析指数随温度的变化曲线,计算结果和试验结果基本吻合。
Equilibrium solidification phase diagram of GH 4738 superalloy was calculated by using Thermal-calc software,based on which experimental parameters of homogenization treatment was established.The segregation of as-cast GH4738 superalloy was observed by using OM and SEM,the laws of element segregation in the as-cast alloy with as-cast and different diffused annealing state at different temperatures were studied by using EPMA technique.The results show that Ti element segregation is the most serious in the as-cast alloy,the segregation of Ti element is significantly improved after the alloy treated by high-temperature diffusion annealing process,and the effect is the most significant after annealing at 1200℃for 50 h.Meanwhile,the change curves of the residual segregation index versus temperature is calculated,and the calculated results are basically in accord with the experimental results.
作者
苏醒
史松宜
吕旭东
Su Xing;Shi Songyi;LüXudong(High-temperature Materials Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Beijing CISRI-GAONA Materials&Technology Co.,Ltd.,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第10期48-53,共6页
Heat Treatment of Metals