Fracture cause analysis of QBe2 beryllium bronze connector

doi:10.13251/j.issn.0254-6051.2022.07.050

Abstract

Abstract: A batch of connector made of QBe2 fractured in the course of service was fratured. Reason for fracture was analyzed by the methods such as microscopic morphology observation, chemical composition analysis, microstructure observation and hardness test; and contral mensuren was proposed. The results show that overheating of the connector caused in thermocouples fail lead to coarse grain in solution and aging treatment. The strength of the grain boundary becomes lower than the matrix, and lead to the fracture of connector when it is subjected to external force. Therefore, it is recommended to regularly monitor and maintain the thermocouple to ensure the normal operation of the equipment.

Key words: beryllium bronze, overheating, fracture

CLC Number:

TG172.9

Wei Caili, Zhang Shenjie, Du Gangfeng. Fracture cause analysis of QBe2 beryllium bronze connector[J]. Heat Treatment of Metals, 2022, 47(7): 286-288.

References

[1]马宁伟. 电子产品结构材料特性及其选择方法[M]. 北京: 人民邮电出版社, 2010: 86.
[2]王良辉, 孙红亮. QBe2断裂弹簧片失效机理分析[J]. 热加工工艺, 2012, 41(12): 218-221.
Wang Lianghui, Sun Hongliang. Failure analysis and mechanism of QBe2 spring piece [J]. Hot Working Technology, 2012, 41(12): 218-221.
[3]狄平. 铍青铜形变时效工艺的优化[J]. 金属热处理, 2003, 28(2): 63-64, 69.
Di Ping. Optimization of deformation aging process of beryllium bronze [J]. Heat Treatment of Metals, 2003, 28(2): 63-64, 69.
[4]杨鑫, 于芳, 苗伟, 等. 真空时效对QBe2铍青铜组织与性能的影响[J]. 金属热处理, 2013, 38(7): 17-20.
Yang Xin, Yu Fang, Miao Wei, et al. Influences of vacuum aging on microstructure and properties of beryllium bronze QBe2[J]. Heat Treatment of Metals, 2013, 38(7): 17-20.
[5]孙守功. 铍青铜弹簧热处理工艺改进[J]. 金属热处理, 2003, 28(8): 60-61.
Sun Shougong. Improvement of heat treatment process for beryllium bronze spring[J]. Heat Treatment of Metals, 2003, 28(8): 60-61.
[6]王笑春, 傅萍. 铍青铜弹簧卡片断裂原因分析及工艺改进措施[J]. 机械, 2008, 35(5): 78-80.
Wang Xiaochun, Fu Ping. Fracture cause and technology improvement method of beryllium bronze spring[J]. Machinery, 2008, 35(5): 78-80.
[7]姚春臣, 王海云, 李明, 等. QBe2铍青铜簧片的时效及检验工艺研究[J]. 新技术新工艺, 2010(4): 80-83.
Yao Chuncheng, Wang Haiyun, Li Ming, et al. Research of practical and inspection process of QBe2 beryllium bronze blade springs [J]. New Technology and New Process, 2010(4): 80-83.
[8]韩继成. 铍青铜的热处理与常见缺陷的分析和补救对策[J]. 机械工艺师, 2001(3): 41-44.
[9]余艳妮, 朱宝辉, 刘守田, 等. 铍青铜棒材中裂纹产生的原因分析[J]. 理化检验—物理分册, 2008, 44(12): 704-707.
Yu Yanni, Zhu Baohui, Liu Shoutian, et al. Analysis of crack produced cause of beryllium-bronze bar[J]. Physical Testing and Chemical Analysis (Part A: Physical Testing), 2008, 44(12): 704-707.
[10]钟群鹏, 赵子华. 断口学[M]. 北京: 高等教育出版社, 2006: 200.
[11]韩明达, 朱宝辉, 韩俊刚. QBe2铍青铜棒热处理断裂原因分析[J]. 理化检验—物理分册, 2014, 50(4): 299-302.
Han Mingda, Zhu Baohui, Han Jungang. Causes analysis on fracture of QBe2 beryllium-bronze bars during heat treatment [J]. Physical Testing and Chemical Analysis (Part A: Physical Testing), 2014, 50(4): 299-302.

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