金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 284-288.DOI: 10.13251/j.issn.0254-6051.2022.12.047

• 测试与分析 • 上一篇    下一篇

35CrMnSiA超高强度钢典型断口及原因分析

王春燕, 章发, 介瑞华, 汪春梅   

  1. 芜湖新兴铸管有限责任公司 理化检测中心, 安徽 芜湖 241002
  • 收稿日期:2022-08-10 修回日期:2022-11-04 出版日期:2022-12-25 发布日期:2023-01-05
  • 作者简介:王春燕(1985—),女,高级工程师,硕士,主要研究方向为钢产品的理化检验及失效分析,E-mail:459410898@qq.com

Typical fracture and cause analysis of 35CrMnSiA ultra-high strength steel

Wang Chunyan, Zhang Fa, Jie Ruihua, Wang Chunmei   

  1. Physical and Chemical Testing Center, Wuhu Xinxing Ductile Iron Pipes Co., Ltd., Wuhu Anhui 241002, China
  • Received:2022-08-10 Revised:2022-11-04 Online:2022-12-25 Published:2023-01-05

摘要: 为了分析35CrMnSiA超高强度钢拉伸试样断面收缩率低的断裂机理和断裂原因,采用扫描电镜及能谱仪等对常见的4类断口进行了观察和分析。结果表明,一定量的氢和拉应力的共同作用产生的鱼眼缺陷是导致常规塑性断口断面收缩率低的主要原因。韧脆混合断口是由于在较大颗粒的夹杂物周围产生了氢脆,导致钢的断面收缩率下降。笔尖状断口主要是由于钢中大颗粒夹杂物或氢损伤缺陷造成的。脆性断口是由于机械标识对材料造成了损伤或氢在表面损伤处聚集形成了微裂纹。

关键词: 35CrMnSiA钢, 断口分析, 断裂机理, 断裂原因, 夹杂物, 氢脆

Abstract: In order to investigate the fracture mechanism and fracture causes of the low percentage reduction of area of the 35CrMnSiA ultra-high strength steel tensile specimens, four common types of fractures were observed and analyzed by means of scanning electron microscope and energy dispersive spectrometer. The results show that the fish-eye defect caused by the combined action of a certain amount of hydrogen and tensile stress is the main reason for the low percentage reduction of area of conventional plastic fracture. Brittle-plastic mixed fracture is caused by hydrogen embrittlement around large inclusions, which leads to the decrease of the percentage reduction of area of the steel. The pencil-tip shaped fracture is mainly caused by large particle inclusions or hydrogen damage defects in steel. Brittle fracture is caused by mechanical damage to the material or the formation of micro-cracks caused by hydrogen accumulation on the damaged surface.

Key words: 35CrMnSiA steel, fracture analysis, fracture mechanism, fracture reason, inclusion, hydrogen embrittlement

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