Causes of abnormal magnetic particle detection of a GCr15 bearing steel blade ring after heat treatment
摘 要
GCr15轴承钢叶片环经热处理后,进行磁粉探伤检查,发现其侧面沿轴向发生磁粉聚集现象,擦拭磁粉后表面恢复平整。采用化学成分分析、宏观观察、金相检验及能谱分析等方法,分析了该叶片环外表面发生磁粉聚集的原因。结果表明:该叶片环采用多只叠加及夹具紧固的方式进行淬火处理,淬火介质易残留在叶片环之间的间隙中且较难清洗,淬火介质中的氯离子诱发腐蚀,进而在距离叶片环外表面8. 9 μm处形成点蚀坑,点蚀造成磁粉聚集现象。
Abstract
After heat treatment, magnetic particle testing was perofrmed on GCr15 bearing steel blade ring, it was found that the magnetic particle aggregation along the axial direction occurred on its outer surface. The surface returned to normal after wiping the magnetic powder. Using methods such as chemical composition analysis, macro observation, metallographic inspection and energy spectrum analysis, the reasons for the accumulation of magnetic particles on the outer surface of blade ring were analyzed. The results showed that the blade ring was quenched with multiple stacks and clamps. The quenching medium was easy to remain in the gap between blade rings and was difficult to clean. The chlorine ions of quenching medium induced corrosion, and then pitting pits were formed at a distance of 8. 9 μm from the outer surface of the blade ring, magnetic particle aggregation was caused by pitting corrosion.
中图分类号 TG115 DOI 10.11973/lhjy-wl202201016
所属栏目 质量控制与失效分析
基金项目
收稿日期 2021/1/21
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备注章宝明(1968-),男,高级工程师,主要从事轴承检测技术与分析工作,1563461310@qq.com
引用该论文: ZHANG Baoming,SHANG Yanwei,NI Jun,ZHANG Binhui. Causes of abnormal magnetic particle detection of a GCr15 bearing steel blade ring after heat treatment[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(1): 62~63
章宝明,尚延伟,倪军,张斌辉. GCr15轴承钢叶片环热处理后磁粉探伤异常的原因[J]. 理化检验-物理分册, 2022, 58(1): 62~63
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参考文献
【1】管明荣.Cl-离子对孔蚀的作用机理[J].青岛理工大学学报,1997(3):95-98.
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