热处理对选区激光熔化制备GH3536镍基高温合金组织性能的影响研究  

Study on Effect of Heat Treatment on Microstructure and Properties of GH3536 Superalloy Fabricated by Selective Laser Melting

作　　者：白洁 马瑞[1] 王亚军[1] 李庆华[2] BAI Jie;MA Rui;WANG Yajun;LI Qinghua(Beijing Power Machinery Research Institute,Beijing 100072,China;School of Materials Science and Engineering,Northwest Polytechnic University,Xi'an,Shanxi 710074,China)

机构地区：[1]北京动力机械研究所,北京100072 [2]西北工业大学材料科学与工程学院,陕西西安710074

出　　处：《河北工程大学学报（自然科学版）》2023年第3期106-112,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家重点研发计划资助项目(2018YFB1106405)。

摘　　要：通过选区激光熔化技术制备了GH3536镍基高温合金,并在900℃不同保温时间下(0.5,1.0,1.5,2.0,2.5 h)进行热处理。利用光镜、X射线衍射、电子背散射衍射、纳米压痕和维氏硬度分析了沉积态和不同热处理态的微观组织和力学性能。结果发现,沉积态组织内部存在细小枝晶,经热处理后部分消失,部分转变为再结晶晶粒。沉积态横截面(Z面)晶粒主要沿着(111)面和(001)面生长,热处理后的晶粒主要沿着(101)面生长。沉积态硬度为303 HV 0.5,杨氏模量为218 GPa,经热处理后杨氏模量基本不变,但硬度显著降低,为273 HV 0.5左右。GH3536 nickel-based superalloy was fabricated by selective laser melting technology(SLM)and heat treated at 900℃for different holding times(0.5 h,1.0 h,1.5 h,2.0 h,2.5 h).Optical microscopy,X-ray diffraction,electron backscatter diffraction,nanoindentation and Vickers hardness were used to analyze the microstructure and mechanical properties of the deposition and different heat treatment states.The results show that there are fine dendrites in the deposited microstructure,some of them disappear after heat treatment,while some of them change into recrystallized grains.Grains of horizontal plane(Z plane)in the deposited state mainly grow along the(111)plane and(001)plane.After heat treatment,the grains mainly grow along the(101)plane.The hardness of the deposited sample is 303 HV 0.5,and Young's modulus is 218 GPa.After heat treatment,Young's modulus is basically unchanged,but the hardness significantly decreases to about 273 HV 0.5.

关 键 词：选区激光熔化 镍基高温合金 显微组织 力学性能 

分 类 号：TG156[金属学及工艺—热处理] TG665[金属学及工艺—金属学] TG132.3[一般工业技术—材料科学与工程]