Failure Mechanism Analysis of 25Cr2MoVA Locating Bolts Made in China

WANG Xi; LI Zhenliang; KE Hao

doi:10.3969/J.ISSN.2095-3429.2017.05.009

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Failure Mechanism Analysis of 25Cr2MoVA Locating Bolts Made in China

更新时间：2026-01-28

- Failure Mechanism Analysis of 25Cr2MoVA Locating Bolts Made in China
- Vol. 38, Issue 5, Pages: 39-40(2017)
- 作者机构：
  
  华电电力科学研究院,浙江,杭州,310030
- 作者简介：
- 基金信息：
- DOI：10.3969/J.ISSN.2095-3429.2017.05.009
  CLC： TM621
- Published Online：30 October 2017，
  
  Published：2017
- 稿件说明：
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WANG Xi, LI Zhenliang, KE Hao. Failure Mechanism Analysis of 25Cr2MoVA Locating Bolts Made in China[J]. 2017, 38(5): 39-40.
DOI：

WANG Xi, LI Zhenliang, KE Hao. Failure Mechanism Analysis of 25Cr2MoVA Locating Bolts Made in China[J]. 2017, 38(5): 39-40. DOI： 10.3969/J.ISSN.2095-3429.2017.05.009.

摘要

通过宏观、光谱、硬度、冲击功、金相组织等分析手段对国产25Cr2MoVA定位螺栓的断裂失效机理进行了研究。结果表明:失效螺栓为脆性疲劳断裂

硬度值高于标准上限

冲击功远低于标准下限

金相组织为回火索氏体

组织具有一定方向性

球化不完全

这与其热处理不当密切相关

故不能满足其运行性能要求。

Abstract

Comprehensive analysis was carried on by means of macro analysis and chemical composition analysis

metallographic examination

mechanical properties testing to analysis the failure mechanism of 25Cr2MoVA locating bolts.The results show that morphology of the fracture was typical fatigue failure.the hardness of the fractured position was higher than requirements and the impact energy is well below the requirements.The microstructure is tempered.orga-nization has a certain direction

the ball is not complete.This is closely related to its improper heat treatment

it can not meet its operational performance requirements

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