50CrVA弹簧断裂机理及预防
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作者单位:

航天材料及工艺研究所,北京 100076

中图分类号:

TB31


Failure Analysis of 50CrVA Spring and Precautions
Author:
Affiliation:

Aerospace Research Institute of Materials & Processing Technology,Beijing 100076

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    摘要:

    以两个批次断裂50CrVA弹簧为研究对象,通过对弹簧的断口分析、化学成分分析、微观组织分析和硬度测试的方法,揭示了两个批次弹簧的断裂模式和断裂机理,并提出有效的改进措施。结果表明:两批弹簧的断裂模式均为延迟脆性断裂,第一批弹簧的断裂机理为氢脆,可通过提高材料的回火温度和减少酸洗时间降低弹簧发生氢脆的风险;第二批弹簧的断裂机理为镉脆,可采用镀锌工艺替代镀镉工艺,提高弹簧镀层的耐热温度,降低弹簧出现低熔点金属致脆风险。

    Abstract:

    Two batches of cracked 50CrVA springs are analyzed by means of fracture analysis, chemical composition analysis, microstructure analysis and hardness test. The fracture mode and mechanism are revealed as well as the effective improvement measures. The results indicate that the fracture mode of the two batches of springs are both delayed brittle fracture. The fracture mechanism of the first batch is attributed tohydrogen embrittlement. The risk of hydrogen embrittlement can be reduced by increasing the tempering temperature and reducing the pickling time. The fracture mechanism of the second batch of springs is cadmium embrittlement. Zinc plating process can be used to enhance the heat resistance temperature of the springs coating and decrease the risk of embrittlement caused by low melting point metal.

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王影,马兆庆,袁建宇,逄锦程,韩露.50CrVA弹簧断裂机理及预防[J].宇航材料工艺,2024,54(6):85-90.

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  • 收稿日期:2022-08-04
  • 最后修改日期:2023-02-19
  • 录用日期:2023-02-24
  • 在线发布日期: 2025-01-13
  • 出版日期: 2024-12-30
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《宇航材料工艺》2025年青年编委招募启事

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