粉末冶金V-5Cr-5Ti合金的制备与性能

Preparation and Performance of Powder Metallurgy V-5Cr-5Ti Alloy

摘要:

：以氢化脱氢粉末为原料,采用冷等静压和真空烧结制备了V-5Cr-5Ti 合金,并利用热等静压、热锻和热处理来改善其组织和性能。利用XRD 衍射仪测定原料及V-5Cr-5Ti 合金的物相。利用氧氮分析仪、材料试验机、金相显微镜(OM)和扫描电镜(SEM)等测试了不同状态V-5Cr-5Ti 合金试样的氧氮含量、力学性能及断口形貌。结果表明：粉末冶金V-5Cr-5Ti合金的相对密度达到99%以上,物相组成为单一bcc 相钒合金固溶体。热锻后退火试样氧质量分数小于600mg/g,抗拉强度490 MPa,屈服强度368 MPa,延伸率和断面收缩率分别为28%和61.5%,断口形貌由细小韧窝组成。

Abstract:

V-5Cr-5Ti alloy was prepared from vacuum sintering hydrogenation dehydrogenization powder by cold isostatic pressing(CIP). Hot isostatic pressing(HIP), hot forging and heat treatment were subsequently used to improve the microstructure and properties of V-5Cr-5Ti alloy. The phase composition of raw materials and V-5Cr-5Ti alloy was characterized using by XRD．The content of oxygen and nitrogen of V-5Cr-5Ti alloy was tested. Microstructures and mechanical properties of V-5Cr-5Ti alloy were investigated using by OM, SEM and mechanical property tester. The results show that the relative density of the powder metallurgy(PM)V-5Cr-5Ti alloy is as high as 99%. V-5Cr-5Ti alloy consists of single bcc phase vanadium alloy solid solution. The oxygen weight percent of V-5Cr-5Ti alloy annealed after hot forging is less than 600×10-6, the tensile strength is 490 MPa, yield strength is 368 MPa, and the elongation and reduction of area are 28% and 61.5%, respectively. Thefracture morphology is composed of all fine ductile dimples.