SWRH72B钢涡卷弹簧断裂分析

doi:10.13251/j.issn.0254-6051.2025.12.050

金属热处理 ›› 2025, Vol. 50 ›› Issue (12): 328-332.DOI: 10.13251/j.issn.0254-6051.2025.12.050

• 失效分析 • 上一篇

SWRH72B钢涡卷弹簧断裂分析

钟世标, 吴冰冰, 万天, 曾志卫, 许佳佳

深圳市美信检测技术股份有限公司, 广东深圳 518108

收稿日期:2025-07-17 修回日期:2025-10-25 发布日期:2026-01-06
通讯作者: 吴冰冰,中级工程师,硕士,E-mail: wbb@2012.cqut.edu.cn
作者简介:钟世标(1996—),男,工程师,硕士,主要从事金属材料检测及零件失效分析,E-mail: 1426204534@qq.com。

Fracture analysis of SWRH72B steel flat spiral spring

Zhong Shibiao, Wu Bingbing, Wan Tian, Zeng Zhiwei, Xu Jiajia

Shenzhen Meixin Testing Technology Co., Ltd., Shenzhen Guangdong 518108, China

Received:2025-07-17 Revised:2025-10-25 Published:2026-01-06

摘要/Abstract

摘要： 某汽车座椅靠背骨架的SWRH72B钢涡卷弹簧在进行质量测试,翻折到最大角度时,发生了异常断裂。采用外观检查、断口形貌分析、化学成分分析、显微组织分析和硬度测试等方法对该弹簧断裂原因进行分析。结果表明,表面局部形成的非回火马氏体在应力状态下沿晶开裂是造成该弹簧异常断裂的主要原因。由于弹簧表面受到电接触损伤并引起瞬间高温,表面局部组织在瞬间加热完成奥氏体化后又急速冷却,最终导致硬而脆的非回火马氏体形成。

关键词: 涡卷弹簧, 断裂, SWRH72B钢, 非回火马氏体

Abstract: A SWRH72B steel flat spiral spring installed on the back frame of a car seat broke abnormally when it was turned over to maximum angle during seat quality test. The fracture cause of the spring was analyzed by means of appearance inspection, fracture morphology analysis, chemical composition analysis, microstructure analysis and hardness test. The results show that the fracture of untempered martensite formed locally on the surface is the main reason for the abnormal fracture of the spring. Because the surface of the spring is damaged by electrical contact and causes instantaneous high temperature, the local microstructure of the surface is rapidly cooled after austenitizing by instantaneous heating, which eventually leads to the formation of hard and brittle untempered martensite.

Key words: flat spiral spring, fracture, SWRH72B steel, untempered martensite

中图分类号:

TG142.41

钟世标, 吴冰冰, 万天, 曾志卫, 许佳佳. SWRH72B钢涡卷弹簧断裂分析[J]. 金属热处理, 2025, 50(12): 328-332.

Zhong Shibiao, Wu Bingbing, Wan Tian, Zeng Zhiwei, Xu Jiajia. Fracture analysis of SWRH72B steel flat spiral spring[J]. Heat Treatment of Metals, 2025, 50(12): 328-332.

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SWRH72B钢涡卷弹簧断裂分析

Fracture analysis of SWRH72B steel flat spiral spring

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