时效对NiW中/重合金组织和力学性能的影响  

Effect of aging treatment on microstructure and mechanical properties of NiW medium/heavy alloy

作　　者：吴博 王万年 曹国鑫 周珉旭 陆杰波 王晓红 陈占兴 马腾飞 WU Bo;WANG Wan-nian;CAO Guo-xin;ZHOU Min-xu;LU Jie-bo;WANG Xiao-hong;CHEN Zhan-xing;MA Teng-fei(Zhejiang Provincial Key Laboratory of Aerodynamic Equipment Technology,Quzhou University,Quzhou 324000,China;School of Materials Science and Engineering,Zhengzhou Institute of Aviation Industry Management,Zhengzhou 450046,China;Xi’an Superalloy Technology Co Ltd,Xi’an 710016,China)

机构地区：[1]衢州学院浙江省空气动力装备技术重点实验室,浙江衢州324000 [2]郑州航空工业管理学院材料科学与工程学院,河南郑州450046 [3]西安聚能高温合金材料科技有限公司,陕西西安710016

出　　处：《材料热处理学报》2024年第10期102-109,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52001262)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、MT370电子万能试验机和维氏显微硬度仪等研究了不同时效处理条件下Ni-42W-10Co-1Mo中/重合金的微观组织和力学性能。结果表明:合金的初始锻态组织为条带状组织,存在明显的细晶和析出相条带;在600~900℃时效温度范围内,随着温度的升高,合金部分晶粒发生再结晶,相对锻态组织更加均匀,σ析出相由锻态合金中的颗粒状逐步转变为针状和块状μ相(900℃)。经700℃时效,合金的屈服强度和抗拉强度分别由锻态的845.2和1187.3 MPa提高至924.8和1228.8 MPa,但塑性有所降低。而经更高温度(800和900℃)的时效处理,合金强度和塑性均呈明显下降趋势。合金的断裂方式随着时效温度的升高由韧性断裂逐渐变为混合型断裂方式,这主要是由于块状与针状μ相导致的。Microstructure and mechanical properties of Ni-42W-10Co-1Mo medium/heavy alloy under different aging treatment conditions were studied using optical microscope(OM),scanning electron microscopy(SEM),MT370 electronic universal testing machine and Vickers microhardness tester.The results show that the initial forged microstructure of the alloy is a strip like structure,with obvious fine grains and precipitated phase bands.Within the aging temperature range of 600-900℃,as the temperature increases,some grains of the alloy undergo recrystallization,resulting in a more uniform microstructure compared to the forged state,and the precipitated phaseσgradually transforms from granular shape in the forged alloy to needle like and block likeμphase(900℃).After aging at 700℃,the yield strength and tensile strength of the alloy increase from 845.2 and 1187.3 MPa as forged to 924.8 and 1228.8 MPa,respectively,but the plasticity decreases.After aging treatment at higher temperatures(800 and 900℃),the strength and plasticity of the alloy show a significant downward trend.The fracture mode of the alloy gradually changes from ductile fracture to mixed fracture with the increase of aging temperature,mainly due to the block and needle likeμphase.

关 键 词：NiW合金 中重合金(MHA) 热处理 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]