航空材料学报2024，Vol.44Issue(1)：93-103,11.DOI:10.11868/j.issn.1005-5053.2023.000066
原位拉伸研究热处理对激光选区熔化GH4169合金组织及650℃力学性能的影响
Effect of heat treatment on microstructure and mechanical properties of selective laser melting GH4169 alloy at 650 ℃ :in-situ SEM investigation
摘要
Abstract
The effect of heat treatment on the microstructure and high temperature mechanical properties of SLM GH4169 alloy was studied by using a self-developed in-situ high temperature tensile device.The results show that the grain morphology of as-built alloy changes from columnar crystal to equiaxed crystal after homogenization+solid solution+aging treatment(HSA),coupling with Laves phase dissolution,and a large amount of γ′and γ″strengthening phase precipitates.At 650℃,the yield strength and tensile strength of the as-built sample are 574 MPa and 740 MPa,while the yield strength and tensile strength of HSA sample are 818 MPa and 892 MPa respectively,which are 42.5%and 20.1%higher than that of the deposited alloy.The deformation process can be further characterized by in-situ tensile testing.The surface grain undulation of the as-built sample gets larger,the coordinated deformation ability becomes stronger,and the plastic flow ability gets better.The cracks in the as-built sample are originated around the Laves phase,spreading along the dendrite towards the maximum shear stress,and shear fracture occurs after necking of the sample.In HSA samples,the cracks are initiated around carbides and propagating along the grain boundaries.The fracture mode is a mixed type,involving both intergranular and transgranular fractures.关键词
GH4169合金/激光选区熔化/高温原位拉伸/热处理Key words
GH4169 alloy/selective laser melting/high temperature in situ tensile/heat treatment引用本文复制引用
朱嘉冕,吕国森,姜文祥,程晓鹏,贾泽一,吕俊霞,黄帅,张学军..原位拉伸研究热处理对激光选区熔化GH4169合金组织及650℃力学性能的影响[J].航空材料学报,2024,44(1):93-103,11.基金项目
中国航空发动机集团产学研合作项目(HFZL2021CXY020) （HFZL2021CXY020）
北京市自然科学基金(2232042) （2232042）
