有色金属科学与工程2024，Vol.15Issue(2)：265-273,9.DOI:10.13264/j.cnki.ysjskx.2024.02.013
热处理对选区激光熔化Co-Cr合金微观组织与力学性能的影响
Effects of heat treatment on the microstructure and mechanical performance of Co-Cr alloy by selective laser melting
张波 1刘艺 1夏书标2
作者信息
- 1. 贵阳职业技术学院,贵阳 550081
- 2. 曲靖师范学院化学与环境科学学院,云南 曲靖 655011
- 折叠
摘要
Abstract
Heat treatment of laser additive manufactured materials cannot only eliminate thermal stress during the printing process,but also regulate their microstructure and mechanical properties.This article studies the changes in the microstructure of selective laser melted Co-Cr alloy under different heat treatment conditions and its corresponding mechanical properties.It was found that the alloy structure in the as-printed state was γ-austenite,with a large amount of dislocation,sub-grain boundaries,and a small amount of tetragonal σ-CoCr precipitation phase in the matrix.A γ-ε transformation occurred at 1 150℃with a holding time of 1 h,and the volume fraction of ε-martensite was 10.4%.At the same time,the precipitation phase transformed from a tetragonal σ-phase to a hexagonal Co3W(Mo)2Si phase.After further treatment at 800℃for 2 h,the martensite content increased to 15.5%,and the quantity and size of the precipitation phase increased.The influence of the precipitation phase on the mechanical properties after heat treatment was significant.The material's hardness increased from 31 HRC to 38 HRC,and the yield strength increased from 848 MPa to 1 119 MPa.This study can provide a reference for the microstructure and property regulation of Co-based alloys by selective laser melting.关键词
选区激光熔化/Co-Cr合金/热处理/沉淀相/力学性能Key words
selective laser melting/Co-Cr alloy/heat treatment/precipitation phase/mechanical performance分类
矿业与冶金引用本文复制引用
张波,刘艺,夏书标..热处理对选区激光熔化Co-Cr合金微观组织与力学性能的影响[J].有色金属科学与工程,2024,15(2):265-273,9.
