| G12MnMo7-4钢异常组织分析及调质工艺优化 |
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| 引用本文： | 常有余,宋仲明,李富燕,苟春林. G12MnMo7-4钢异常组织分析及调质工艺优化[J]. 金属热处理, 2022, 47(6): 266-269. DOI: 10.13251/j.issn.0254-6051.2022.06.047 |
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| 作者姓名： | 常有余 宋仲明 李富燕 苟春林 |
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| 作者单位： | 中车长江铜陵车辆有限公司,安徽 铜陵 244100 |
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| 摘 要： | 采用光学显微镜(OM)、扫描电镜(SEM)、万能试验机、显微维氏硬度计等对调质态G12MnMo7-4钢铸件出现异常组织原因进行分析,并对其调质工艺做了优化。结果表明,因G12MnMo7-4钢属于低碳合金钢,调质淬火温度较高,致使局部产生过热异常组织;经改进调质工艺(870 ℃保温3 h急冷淬火+580 ℃保温3 h回火)处理后,组织为较细的回火索氏体,且综合性能良好,满足产品技术条件要求。
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| 关 键 词： | G12MnMo7-4钢 异常组织 调质 回火索氏体 |
| 收稿时间： | 2022-01-04 |
Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization |
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| Chang Youyu,Song Zhongming,Li Fuyan,Gou Chunlin. Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization[J]. Heat Treatment of Metals, 2022, 47(6): 266-269. DOI: 10.13251/j.issn.0254-6051.2022.06.047 |
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| Authors: | Chang Youyu Song Zhongming Li Fuyan Gou Chunlin |
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| Affiliation: | CRRC Yangtze Tongling Co., Ltd., Tongling Anhui 244100, China |
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| Abstract: | Reasons for abnormal microstructure of quenched and tempered G12MnMo7-4 steel castings were analyzed by means of optical microscope (OM), scanning electron microscope (SEM), universal testing machine and micro Vickers hardness tester. And the quenching and tempering process was optimized. The results show that G12MnMo7-4 steel is a low-carbon alloy steel, due to high quenching temperature, overheating abnormal structure appears in some parts. After treated by improved quenching and tempering process (870 ℃×3 h rapid quenching+580 ℃×3 h tempering), the microstructure is fine tempered sorbite with good comprehensive properties, which meets the requirements of product technical conditions. |
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| Keywords: | G12MnMo7-4 steel abnormal structure quenching and tempering tempered sorbite |
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