摘要
本工作研究了热处理工艺对一种新型第3代镍基粉末高温合金WZ-A3的γ'相组织的影响规律。主要探究了不同升降温速率的差热分析、干预式冷却实验、过固溶冷速及时效制度对WZ-A3合金的γ'相的回溶与析出行为以及对γ'相的尺寸和微观组织的影响规律。结果表明:过固溶热处理冷却时不同冷速下,WZ-A3合金γ'相的开始析出温度介于1148~1165℃,最大析出率温度介于1028~1037℃;采用更慢的冷速能进一步观察到γ'相次第析出;过固溶热处理的温度对冷却析出的二次γ'相的尺寸无明显影响;过固溶热处理后的冷速与冷却析出的γ'相尺寸成反比,采用幂函数y=1490.74x^(-0.509)能较好地反映这一关系,其中,y为γ'相尺寸(nm),x为冷却速度(℃/min);800℃短时时效对二次γ'相尺寸和形貌无明显影响;实验合金γ'相粗化激活能为278 kJ/mol。
This work investigated the influence of heat treatment processes on theγ'phase microstructure of a novel third-generation nickel-based powder superalloy WZ-A3.Differential thermal analysis of different heating and cooling rates,interventional cooling tests,super-solvus cooling rate tests and aging heat treatment experiments were carried out in order to investigate the dissolution and precipitation behavior ofγ'phase as well as its size evolution.The results indicate that when the WZ-A3 alloy is cooled at different cooling rates during super-solvus heat treatment,the initial precipitation temperature ofγ'phase is between 1148~1165°C,the fastest precipitation temperature is between 1028~1037℃.More secondaryγ'phase precipitation can be obtained using a slower cooling rate.The temperature of the super-solvus heat treatment has no significant effect on the size of the secondaryγ'phase.The cooling rate after solution heat treatment is inversely proportional to the size of theγ'phase.This relationship can be expressed as a power law function y=1490.74x^(-0.509),where y is the size of theγ'phase(nm),x is the cooling rate(℃/min).Short-time aging at 800℃has no obvious influence on the size and morphology of the secondaryγ'phase.The activation energy of theγ'phase coarsening of the studied alloy is 278 kJ/mol.
作者
程俊义
朱立华
马向东
肖磊
计红军
郭建政
Cheng Junyi;Zhu Lihua;Ma Xiangdong;Xiao Lei;Ji Hongjun;Guo Jianzheng(Shenzhen Wedge Central South Research Institute Co.,Ltd,Shenzhen 518000,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第10期3722-3731,共10页
Rare Metal Materials and Engineering
基金
国家科技重大专项(2017-VI-0009-0080)
深圳市工业和信息化局项目(201806071354163490,201806071114243770)
广东省重点领域研发计划(2019B010935001)。
关键词
第3代镍基粉末高温合金
热处理
显微组织
γ'相
third-generation nickel-based PM superalloy
heat treatment
microstructure
γ'phase
