不同热处理工艺对K4169高温合金组织和力学性能的影响  

Effect of different heat treatment processes on microstructure and mechanical properties of K4169 superalloy

作　　者：李妍佳 柳瑞 何金珊 胡聘聘 汤鑫 王西涛 肖程波 LI Yanjia;LIU Rui;HE Jinshan;HU Pinpin;TANG Xin;WANG Xitao;XIAO Chengbo(Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Collaborative Innovation Center of Steel Technology,Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials,Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Science),Jinan 250014,China)

机构地区：[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]北京科技大学钢铁共性技术协同创新中心,北京材料基因工程高精尖创新中心,北京100083 [3]齐鲁工业大学(山东省科学院)新材料研究所,山东省轻质高强金属材料省级重点实验室,济南250014

出　　处：《航空材料学报》2021年第4期119-127,共9页Journal of Aeronautical Materials

摘　　要：对比研究标准热处理(SHT)、热等静压+标准热处理(HIP+SHT)以及热等静压+无均匀化热处理(HIP+HTWH)后K4169合金的组织和力学性能,分析K4169合金HIP后进行无均匀化热处理的可行性,提出了一种适用于热等静压K4169合金的热处理制度。组织研究表明:热等静压处理(1170℃/140 MPa/4 h)可以基本消除枝晶间Laves相和δ相;而与HIP+SHT试样相比,无均匀化热处理的试样(HIP+HTWH)晶界上析出了不连续短棒状δ相,但没有对组织的均匀性产生实质影响。力学性能研究表明:相比SHT态,HIP+SHT与HIP+HTWH态合金的室温屈服强度分别提升了73 MPa和91 MPa,持久寿命(704℃/448 MPa)分别提升了35%和32%;虽HIP+HTWH态合金的持久寿命和塑性分散度大于HIP+SHT态,但仍能满足AMS5383对K4169合金力学性能的要求。综合考虑工艺成本的降低、生产效率的提高和力学性能的改善等多种因素,可以确定对于K4169合金结构件而言,HIP+HTWH热处理工艺具有实际应用的潜力。The microstructure and mechanical properties of different heat-treated K4169 alloys after standard heat treatment(SHT),hot isostatic pressing+standard heat treatment(HIP+SHT)and hot isostatic pressing+heat treatment without homogenization(HIP+HTWH)were compared.The feasibility of heat treatment without homogenization of K4169 alloy after HIP was analyzed.A suitable heat treatment system for casting K4169 alloy was proposed.The results on microstructure show that the hot isostatic pressing(1170°C/140 MP/4 h)can basically eliminate the Laves phase andδphase of the alloy.Compared with the alloys after HIP+SHT,discontinuous short rod-likeδphase is existed at some grain boundaries of the sample without homogenization heat treatment(HIP+HTWH),which has no substantial influence on the uniformity of microstructure.The results on mechanical properties show that compared with the alloys after SHT,the yield strength at room temperature of alloys after HIP+SHT and HIP+HTWH is increased by 73 MPa and 91 MPa,and the stress-rupture life(704°C/448 MPa)is increased by 35%and 32%respectively.Although the dispersion of stress-rupture life and plasticity for alloys after HIP+HTWH are higher than that of HIP+SHT,the mechanical properties meet the requirements of AMS5383 for K4169 alloy.The HIP+HTWH heat treatment process has the practical application potential for K4169 alloy structure by comprehensive analysis of various factors such as reduction of process cost,the increase of production efficiency and the improvement of mechanical properties.

关 键 词：K4169 热等静压 无均匀化热处理 显微组织 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]