HDR超低碳双相不锈钢叉型接头开裂失效分析

陈亚平, 韦雨齐, 张华, 姚雄飞, 姜新华

doi:10.16577/j.issn.1001-1560.2022.0236

材料保护 >

2022 , Vol. 55 >Issue 8: 192 - 194

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0236

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HDR超低碳双相不锈钢叉型接头开裂失效分析

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(1. 武汉材料保护研究所有限公司，湖北武汉 430030；2. 武汉船用机械有限责任公司，湖北武汉 430084 )

陈亚平(1984-)，高级工程师，主要从事金属材料物理性能检测分析及金属材料失效分析工作，E - mail：250678500@qq.com

收稿日期: 2022-03-09

修回日期: 2022-03-29

录用日期: 2022-04-11

网络出版日期: 2023-12-17

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Cracking Failure Analysis of HDR Ultra - Low Carbon Duplex Stainless Steel Forked Joint

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(1. Wuhan Research Institute of Materials Protection Co., Ltd., Wuhan 430030, China;2. Wuhan Marine Machinery Plant Co., Ltd., Wuhan 430084, China)

Received date: 2022-03-09

Revised date: 2022-03-29

Accepted date: 2022-04-11

Online published: 2023-12-17

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摘要

HDR超低碳双相不锈钢叉型接头在线切割以及机加工的过程中开裂，导致叉型接头失效。通过对裂纹宏观形貌分析、冲击试验断口分析、基材化学成分分析、开裂部位力学性能检测、金相组织分析、断口微观形貌分析、微区能谱分析等项目的检测结果，综合分析引起HDR叉型接头开裂的原因。结果显示：HDR叉型接头开裂的原因为HDR材料在固溶热处理的过程，冷却速度不够，导致显微组织中晶界处析出大量 σ相，σ相为脆性相，使HDR材料的塑韧性能急剧下降，随后在线切割及机加工的过程中开裂。

关键词：

HDR超低碳双相不锈钢

; σ相; 固溶热处理; 失效分析

本文引用格式

陈亚平, 韦雨齐, 张华, 姚雄飞, 姜新华 . HDR超低碳双相不锈钢叉型接头开裂失效分析[J]. 材料保护, 2022 , 55(8) : 192 -194 . DOI: 10.16577/j.issn.1001-1560.2022.0236

Abstract

The HDR ultra - low carbon duplex stainless steel forked joint could crack and fail during wire cutting and machining. In this paper, the causes of the above - mentioned cracking were comprehensively analyzed by means of crack macroscopic morphology analysis, analysis on the fracture of impact test sample, chemical composition analysis of substrate, mechanical property testing of cracked area, metallographic structure analysis, fracture microscopic morphology analysis, micro - area energy spectrum analysis and other items. Results showed that the reason for the cracking of HDR forked joint was that the cooling speed of HDR material was too low in the process of solution heat treatment, so a large number of σ phases precipitated at the grain boundaries in the microstructure. The σ phases were brittle, which made the HDR material suffer a sharp decrease in plasticity and toughness, and then cracked in the process of wire cutting and machining.

Key words： HDR ultra - low carbon duplex stainless steel; σ phase; solution heat treatment; failure analysis

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