航空材料学报2025，Vol.45Issue(4)：77-84,8.DOI:10.11868/j.issn.1005-5053.2025.000105
热处理冷却方式对FGH96粉末高温合金组织和力学性能的影响
Effect of cooling method during heat treatment on microstructure and mechanical properties of FGH96 powder metallurgy superalloy
汪煜 1刘玉峰 1周磊 1王明礼 2宋晓俊 1孔令伟 1郑亮1
作者信息
- 1. 中国航发北京航空材料研究院先进高温结构材料重点实验室,北京 100095
- 2. 航发优材(镇江)高温合金有限公司,江苏 镇江 212001
- 折叠
摘要
Abstract
Heat treatment is the most critical thermal process determining the properties of powder metallurgy(PM)superalloy components,with FGH96 currently being one of the most prevalent PM Ni-based superalloys.This work investigates the effects of two distinct solution heat treatment cooling methods—full air cooling quenching and combined air-oil cooling quenching—on the microstructure and properties of FGH96 alloy ring parts.The results indicate that both cooling methods yield equivalent grain sizes,ranging from grade 6.5 to 7.Notably,full air-cooled rings exhibit more homogeneous distribution of secondary γʹphase.In contrast,rings subjected to combined air-oil cooling exhibit coarser secondary γʹ phases,with reduced quantity on the inner side compared to the outer side,attributable to internally diminished cooling rate.During the later stage of quenching,ring parts undergoing full air cooling experience a slower cooling rate than those using combined air-oil cooling.Furthermore,fine γʹphases,possessing sizes between the secondary and tertiary γʹphases,precipitate along the grain boundaries using full air cooling method,leading to grain boundary strengthening.This enhances tensile strength but reduces elongation and plastic elongation at 68 h in high-temperature creep tests.Additionally,due to the more uniform cooling rate throughout the ring during full air cooling quenching,the surface residual stress reduces with more uniform distribution,thereby augmenting dimensional stability during subsequent machining processes.关键词
粉末高温合金/冷却方式/显微组织/力学性能/残余应力Key words
powder metallurgy superalloy/cooling method/microstructure/mechanical property/residual stress分类
航空航天引用本文复制引用
汪煜,刘玉峰,周磊,王明礼,宋晓俊,孔令伟,郑亮..热处理冷却方式对FGH96粉末高温合金组织和力学性能的影响[J].航空材料学报,2025,45(4):77-84,8.
