二次固溶加时效对K4648镍基高温合金组织与性能的影响
Effect of secondary solution and aging treatment on microstructure and properties of K4648 nickel-based superalloy
黄军剑 1满卫芳 2高双 1何博1
作者信息
- 1. 上海工程技术大学材料科学与工程学院,上海 201620;上海工程技术大学高温合金精密成型研究中心,上海 201620
- 2. 上海船舶设备研究所,上海 200031
- 折叠
摘要
采用扫描电镜、能谱仪和拉伸试验等研究了二次固溶加时效对K4648镍基高温合金组织与性能的影响.结果表明:二次固溶加时效处理后,合金中析出了尺寸更大的针状α相,M23C6碳化物的尺寸变小;随着二次固溶温度的升高,针状α相逐渐粗化,M23C6数量增多且大部分在晶界处连续分布.经过二次固溶加时效处理,合金抗拉强度显著提高,塑性略有下降.K4648合金的最佳二次固溶温度为1200 ℃,此时合金的抗拉强度达到810 MPa,相比一次固溶加时效提高了约39％,伸长率略微下降,从 17.2％降为 15.3％.
Abstract
Effect of secondary solution and aging treatment on microstructure and properties of K4648 nickel based superalloy was studied using scanning electron microscopy,energy dispersive spectroscopy and tensile testing.The results show that after secondary solution and aging treatment,larger needle like α-phase precipitates in the alloy,and the size of M23C6 carbides decreases.As the secondary solution temperature increases,the needle like α-phase gradually coarsens,and the number of M23C6 increases,with most of it continuously distributed at grain boundaries.After secondary solution and aging treatment,the tensile strength of the alloy is significantly improved,while the plasticity slightly decreases.The optimal secondary solution temperature for the K4648 alloy is 1200 ℃.At this time,the tensile strength of the alloy reaches 810 MPa,which is about 39％higher than that of the primary solution and aging treatment,and the elongation slightly decreases from 17.2％to 15.3％.
关键词
K4648镍基高温合金/二次固溶/显微组织/力学性能/断裂行为Key words
K4648 nickel-based superalloy/secondary solid solution/microstructure/mechanical property/fracture behavior引用本文复制引用
出版年
2024
NETL
NSTL
万方数据