材料工程2017，Vol.45Issue(10)：23-31,9.DOI:10.11868/j.issn.1001-4381.2017.000433
FV520B沉淀硬化不锈钢的MAG堆焊再制造力学特性
Mechanical Characteristic of Remanufacturing of FV520B Precipitation Hardening Stainless Steel Using MAG Surfacing Deposition
摘要
Abstract
Surfacing deposition forming method was adopted to carry out remanufacturing experiment of FV520B precipitation hardening stainless steel.Then the mechanical property characteristic of the remanufacturing layer was tested and studied,contrasted with the corresponding property of sub-strate.The results show that the remanufacturing layer,formed with MAG surfacing of FV520B pre-cipitation hardening stainless steel has mechanical characteristic with high strength and hardness,the tensile strength reaches 1195MPa,exceeds 1092MPa of substrate,yield strength is 776MPa and aver-age hardness is 336 HV,is close to the corresponding property of substrate which is 859MPa and 353 HV respectively;however,the elongation and impact toughness of the remanufacturing layer is merely 8.92% and 61J/cm2 respectively,it has a large gap with the corresponding property 19.72%and 144J/cm2 respectively of substrate.Fracture and microstructure analysis on specimens shows that the microstructure of remanufacturing layer is fast cooling non-equilibrium crystallized lath martens-ite,and carbide precipitated strengthening phase such as NbC,MoC,M23 C6 ,etc,which is the reason that remanufacturing layer has high strength and high hardness.But as lack of aging treatment and Cu strengthening phase,and the weak interface between contaminating brittle phase or large size spheri-cal particles and substrate will deteriorate the deformability and induce stress concentration and crack-ing when the material is load-carrying,and is the main reason of the remanufacturing layer having lower static tensile elongation and impact toughness.关键词
FV520B沉淀硬化不锈钢/再制造/MAG堆焊/力学性能Key words
FV520B precipitation hardening stainless steel/remanufacturing/MAG surfacing/mechani-cal property分类
矿业与冶金引用本文复制引用
柳建,朱胜,蔡志海,张平,刘军,秦航,仝永刚..FV520B沉淀硬化不锈钢的MAG堆焊再制造力学特性[J].材料工程,2017,45(10):23-31,9.基金项目
国家自然科学基金资助项目(51405510,51375492,51575527) （51405510,51375492,51575527）
