| 800 MPa级在线淬火水电钢的回火处理 |
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| 引用本文： | 刘晓玮,周光杰,谭小斌.800 MPa级在线淬火水电钢的回火处理[J].金属热处理,2022,47(8):228-231. |
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| 作者姓名： | 刘晓玮 周光杰 谭小斌 |
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| 作者单位： | 湖南华菱湘潭钢铁有限公司, 湖南 湘潭 411101 |
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| 摘 要： | 对800 MPa级在线淬火(DQ)水电钢回火工艺进行试验研究,分析了3种不同回火温度对试验钢组织和性能的影响。结果表明,控轧后770~820 ℃快速水冷淬火后,在620~680 ℃之间回火,随着回火温度的升高,钢的屈服强度、抗拉强度下降,伸长率和冲击吸收能量提高。650 ℃回火处理可使试验钢达到最佳的强度和韧性匹配。试验钢在620~680 ℃回火后的组织为回火贝氏体,随回火温度的升高,组织中的碳化物逐渐长大并呈现粒状分布,贝氏体组织呈现多边形化特征。
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| 关 键 词： | 水电钢 在线淬火 回火 力学性能 组织 |
| 收稿时间： | 2022-02-25 |
Tempering for direct quenched 800 MPa grade hydropower steel |
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| Liu Xiaowei,Zhou Guangjie,Tan Xiaobin.Tempering for direct quenched 800 MPa grade hydropower steel[J].Heat Treatment of Metals,2022,47(8):228-231. |
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| Authors: | Liu Xiaowei Zhou Guangjie Tan Xiaobin |
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| Affiliation: | Xiangtan Iron and Steel Co., Ltd. of Hunan Valin, Xiangtan Hunan 411101, China |
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| Abstract: | Tempering treatments for a direct quenched 800 MPa grade hydropower steel were studied, and the effect of three different tempering temperature on microstructure and mechanical properties of the steel was analyzed. The results show that after controlled rolling and rapid water cooling quenching at 770-820 ℃, with the increase of tempering temperature in the range of 620-680 ℃, the yield strength and tensile strength decrease, while the elongation and impact absorbed energy of the steel increase. The best match of strength and impact properties is achieved when tempered at 650 ℃. In the tempering temperature range of 620-680 ℃, the microstructure of the steel is tempered bainite, and as the tempering temperature rising, the carbides gradually grow and are granular distributed, and bainite appears polygonal features. |
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| Keywords: | hydropower steel direct quenching tempering mechanical properties microstructure |
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