中国电机工程学报Issue(17)：4439-4444,6.DOI:10.13334/j.0258-8013.pcsee.2015.17.019
镍基合金740 H的组织结构与析出相分析
Microstructure and Precipitates of Alloy 740H
摘要
Abstract
Microstructure and precipitates and their effects on the room-temperature hardness and impact toughness of alloy 740H with different conditions were investigated. The as-received alloy contains (Nb,Ti) C and TiN particles inside grains and some discontinuous M23C6 carbide particles along grain boundaries. After an aging treatment at 800℃ for 16h and cooled in air (standard heat-treated condition), a large number of extreme fineγ' particles precipitated within grains and small carbide particles are located along grain boundaries. The hardness is increased to 304HB and impact toughness is remarkably decreased to 37.5J/cm2 after standard heat treatment, respectively. At 750℃, aging results in an increase of M23C6 particles at grain boundaries and coarsening ofγ' phase. In the period of 300~3000h aging, the coherency betweenγ' and matrix is maintained and the hardness and toughness are 323~331HB and 25~35J/cm2, respectively. The stability of toughness of the aged alloy 740H is greater than those of the aged alloy 740.关键词
镍基高温合金/740/740 H/时效/组织结构/析出相Key words
Ni-base alloy/740/740H/aging/microstructure/precipitate分类
矿业与冶金引用本文复制引用
郭岩,周荣灿,张红军,张周博,侯淑芳,王博涵..镍基合金740 H的组织结构与析出相分析[J].中国电机工程学报,2015,(17):4439-4444,6.基金项目
国家高技术研究发展计划(863计划)(2012AA050501)；国家能源应用技术研究及工程示范项目(NY20110102)；2010年度中国电机工程学会电力青年科技创新项目(003)。National High Technology Research and Development Program of China (2012AA050501) （863计划）
National Energy Applied Technology and Engineering Demonstration Program (NY20110102-1) （NY20110102-1）
CSEE Youth Science& Technology Innovation Project (003) （003）
