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材料导报  2025, Vol. 39 Issue (15): 24080123-7    https://doi.org/10.11896/cldb.24080123
  金属与金属基复合材料 |
热处理对热丝激光增材制造17-4PH不锈钢组织性能的影响
张鹏德, 李广*, 刘玉鹏, 石玗*
兰州理工大学,省部共建有色先进加工与再利用国家重点实验室,兰州 730050
The Influence of Heat Treatment on Microstructure and Properties of 17-4PH Stainless Steel Fabricated of Hot Wire Laser Additive Manufacturing
ZHANG Pengde, LI Guang*, LIU Yupeng, SHI Yu*
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
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摘要 激光增材制造(LAM)工艺过程中存在的高温度梯度和层间循环加热效应,导致沉积材料晶粒生长与力学性能呈现显著的各向异性特征,因此,通过热处理改善LAM材料的微观组织并调控力学性能至关重要。本工作对热丝激光增材制造17-4PH不锈钢热处理后的组织、物相组成、硬度和拉伸性能进行了分析。结果表明:17-4PH不锈钢原始态组织为粗大柱状板条马氏体及少量的晶间细小胞状奥氏体。H900热处理后,马氏体晶粒得到细化,晶粒生长各向异性减弱,且有细小碳化沉淀物的析出。H1025热处理后,马氏体晶粒发生粗化,并且在晶界和晶粒内分布细小的逆转变奥氏体。热处理后LAM样品的力学性能优于锻造样品,LAM 17-4PH不锈钢在H900状态下,抗拉强度从1 108 MPa提高到1 506 MPa,抗拉强度与屈服强度分别高于锻造材料11%和15%,硬度最高达448HV,取得了较好的强韧配合。马氏体基体中碳化物的沉淀析出与晶粒细化产生的强化作用协同提高材料强度,逆转变奥氏体增加了17-4PH不锈钢的塑韧性。
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张鹏德
李广
刘玉鹏
石玗
关键词:  17-4PH不锈钢  激光增材制造  热处理  拉伸性能  显微组织    
Abstract: The high temperature gradients and interlayer cyclic heating effects inherent in the laser additive manufacturing (LAM) process result in significant anisotropy in both grain growth and mechanical properties of the deposited material. Consequently, it is imperative to employ heat treatment to refine the microstructure and tailor the mechanical properties of LAM-fabricated components. The microstructure, phase composition, hardness and tensile properties of 17-4PH stainless steel made by hot wire laser additive after heat treatment were analyzed in this work. The results showed that 17-4PH stainless steel original state organization for bulky columnar lath martensite and a small amount of intergranular fine cellular austenitic. After heat treatment with H900, the martensite grains are refined, and the anisotropy of grain growth is weakened, and fine carbonized precipitates are precipitated. After H1025 heat treatment, the martensite grains become coarser, and fine reverse-transformed austenite is distributed along grain boundaries and within grains. After heat treatment, the mechanical properties of LAM sample are better than those of wrought sample. The tensile strength of LAM 17-4PH stainless steel increases from 1 108 MPa to 1 506 MPa under the condition of H900. The tensile strength and yield strength of LAM 17-4PH stainless steel are 11% and 15% higher than those of wrought stainless steel, respectively, and the hardness reaches to 448HV. The precipitation of carbides in martensitic matrix and the strengthening effect of grain refinement improve the strength synergically, and the retrograde austenite increases the plastic toughness of 17-4PH stainless steel.
Key words:  17-4PH stainless steel    laser additive manufacturing    heat treatment    tense property    microstructure
出版日期:  2025-08-10      发布日期:  2025-08-13
ZTFLH:  TG142.1  
基金资助: 甘肃省高校科研创新平台重大培育项目(2024CXPT-06);甘肃省科技重大专项(24ZD13GA018);甘肃省重点研发计划(25YFGA037)
通讯作者:  李广,兰州理工大学副研究员(博士)、硕士研究生导师。主要从事非晶合金中的韧脆转变以及先进焊接技术研究工作。liguang@lut.edu.cn
石玗,兰州理工大学教授(博士)、博士研究生导师。主要从事先进焊接方法、增材制造及再制造方法与理论及焊接过程控制等领域的研究工作。shiyu@lut.edu.cn   
作者简介:  张鹏德,兰州理工大学材料科学与工程学院硕士研究生,在石玗教授的指导下进行研究。目前主要研究领域为金属材料激光增材制造。
引用本文:    
张鹏德, 李广, 刘玉鹏, 石玗. 热处理对热丝激光增材制造17-4PH不锈钢组织性能的影响[J]. 材料导报, 2025, 39(15): 24080123-7.
ZHANG Pengde, LI Guang, LIU Yupeng, SHI Yu. The Influence of Heat Treatment on Microstructure and Properties of 17-4PH Stainless Steel Fabricated of Hot Wire Laser Additive Manufacturing. Materials Reports, 2025, 39(15): 24080123-7.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.24080123  或          https://www.mater-rep.com/CN/Y2025/V39/I15/24080123
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