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| Cause analysis of abnormal etching test of 18CrNiMo7-6 wind power planet wheel forgings |
| DONG Juan1, CAI Fengwei1, CHEN Yongxiang2 |
1. Research Institute, Jiangyin Xingcheng Special Steel Works Co., Ltd., Jiangyin 214429, China;
2. Wind Power Division, Chongqing Gearbox Co.,Ltd., Chongqing 402263, China |
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Abstract The chemical composition, gas content, hardness and non-metallic inclusions of 18CrNiMo7-6 wind power planet wheel forgings were tested to find out the reasons for the abnormal etching test. The results showed that 18CrNiMo7-6 molten steel was not completely deoxidized or it contacted with the air due to the imperfect protective measures during pouring. Al in the steel was oxidized to Al2O3, which was eventually remained and dispersed in the wind power planet wheel forgings, resulting in unqualified forgings etching detection. The forging samples were reanalyzed by etching test. The macroscopic examination on any cross section showed that the same black etching points could be found, which verified the analysis conclusion.
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Received: 01 November 2022
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2023, Vol. 41 
