| 冷却速度对支承辊用Cr5钢显微组织与力学性能的影响 |
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| 引用本文： | 白兴红,赵席春,赵德利,王大鹏,南玉静.冷却速度对支承辊用Cr5钢显微组织与力学性能的影响[J].金属热处理,2022,47(6):69-71. |
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| 作者姓名： | 白兴红 赵席春 赵德利 王大鹏 南玉静 |
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| 作者单位： | 天津重型装备工程研究有限公司, 天津 300457 |
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| 摘 要： | 采用金相显微镜、维氏硬度计、拉伸试验机、夏比摆锤试验机等,研究了冷却速度对支承辊用Cr5钢显微组织与力学性能的影响。结果表明,随着冷却速度的降低,组织中珠光体含量不断增加,试样强度和硬度逐渐下降,塑韧性相近。冷却速度≥3 ℃/min时,组织中珠光体体积分数≤30%,抗拉强度≥1025 MPa、屈服强度≥750 MPa、硬度≥45 HS、冲击吸收能量≥40 J。生产试验表明,采用强风冷冷却的热处理可使辊颈表面至一定深度处的力学性能达到油冷的效果,完全满足支承辊辊颈的力学性能要求。
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| 关 键 词： | 支承辊用Cr5钢 冷却速度 显微组织 力学性能 |
| 收稿时间： | 2022-03-21 |
Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll |
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| Bai Xinghong,Zhao Xichun,Zhao Deli,Wang Dapeng,Nan Yujing.Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll[J].Heat Treatment of Metals,2022,47(6):69-71. |
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| Authors: | Bai Xinghong Zhao Xichun Zhao Deli Wang Dapeng Nan Yujing |
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| Affiliation: | Tianjin Heavy Equipment Engineering Research Co., Ltd., Tianjin 300457, China |
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| Abstract: | Effect of cooling rate on microstructure and mechanical properties of Cr5 steel for backup roll was investigated by means of optical microscopy, Vickers hardness tester, tensile tester and Charpy pendulum impact tester. The results show that with the decrease of cooling rate, the pearlite content increases, the strength and hardness increase, the plasticity and toughness are similar. As the cooling rate reaches above 3 ℃/min, the volume fraction of pearlite in the microstructure is less than 30%, tensile strength ≥1025 MPa, yield strength ≥750 MPa, hardness ≥45 HS, impact absorbed energy ≥40 J. Production test result shows that heat treatment with strong air cooling can make the mechanical properties of the roll neck surface to a certain depth reach the effect of oil cooling, which fully meets the mechanical properties of the backup roll neck. |
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| Keywords: | Cr5 steel for backup roll cooling rate microstructure mechanical properties |
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