焊后热处理对激光束焊接17-4 PH不锈钢微观结构和硬度的影响

Effect of Post-Weld Heat Treatment on Microstructure and Hardness of Laser Beam Welded 17-4 PH Stainless Steel.

作者信息

Tuz Lechosław, Sokołowski Łukasz, Stano Sebastian

机构信息

Faculty of Materials Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Krakow, Poland.

Łukasiewicz Research Network-Institute of Welding, 44-100 Gliwice, Poland.

出版信息

Materials (Basel). 2023 Feb 4;16(4):1334. doi: 10.3390/ma16041334.

DOI:10.3390/ma16041334

PMID:36836963

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9961921/

Abstract

This article presents the results of research on the development of the technology of laser beam butt welding of 17-4 PH stainless steel sheets and the technology of post-weld heat treatment (PWHT). The developed technology allows for favorable conditions to be obtained and for the appropriate microstructure and hardness to exist in the weld area. Moreover, it enables the fulfillment of a number of specific requirements beyond the possibilities of manual welding and other methods. The tests performed include the analysis of the microstructure with the use of light microscopy (LM) for the materials after welding and PWHT. The applied PWHT showed changes in the microstructure and mechanical properties. In all weld areas the martensitic microstructure was observed. The homogeneity of the microstructure in the area of the welded joint after PWTH was revealed. In the as-welded condition and after the PWHT with aging at 481 °C, the hardness was 440 HV5, but after aging at 621 °C, it decreased to 330-340 HV5.

摘要

本文介绍了17-4PH不锈钢薄板激光束对接焊技术及焊后热处理（PWHT）技术的研究成果。所开发的技术能够获得良好的条件，并使焊接区域存在合适的微观结构和硬度。此外，它还能满足一些手工焊接和其他方法无法实现的特定要求。所进行的测试包括使用光学显微镜（LM）对焊接和焊后热处理后的材料进行微观结构分析。所应用的焊后热处理使微观结构和力学性能发生了变化。在所有焊接区域均观察到马氏体微观结构。揭示了焊后热处理后焊接接头区域微观结构的均匀性。在焊态和481℃时效的焊后热处理条件下，硬度为440 HV5，但在621℃时效后，硬度降至330-340 HV5。