Cause Analysis on Early Fracture of 42CrMo Steel Studs for Diesel Engine
摘 要
某柴油机喷油器的42CrMo合金结构钢螺柱出现早期断裂,通过宏观分析、化学成分分析、硬度测试、金相检验、工艺分析、再回火试验等方法,对螺柱断裂原因进行了分析。结果表明:回火温度过低,显微组织转变不充分,造成螺柱硬度、抗拉强度过高,氢脆敏感性增大,同时螺纹表面质量差加剧了应力集中,两者共同作用导致了螺柱的氢致延迟断裂。
Abstract
The 42CrMo alloy structural steel studs of a diesel injector appeared early fracture. The fracture causes were analyzed by means of macroscopic analysis, chemical composition analysis, hardness test, metallographic examination, process analysis, re-tempering test and so on. The results show that the tempering temperature was too low, the microstructure transformation was insufficient, which results that the hardness and tensile strength of the studs were too high and hydrogen embrittlement sensitirity increased. At the same time, the poor surface quality of the threads aggravated the stress concentration. The combined action resulted in hydrogen induced delayed fracture of the studs.
中图分类号 TG157 U464.149 DOI 10.11973/lhjy-wl201901012
所属栏目 质量控制与失效分析
基金项目
收稿日期 2018/5/2
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备注庞建召(1972-),男,高级工程师,主要从事理化检验工作,a789abc@126.com
引用该论文: PANG Jianzhao. Cause Analysis on Early Fracture of 42CrMo Steel Studs for Diesel Engine[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2019, 55(1): 48~51
庞建召. 柴油机42CrMo钢螺柱早期断裂原因分析[J]. 理化检验-物理分册, 2019, 55(1): 48~51
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