| 回火温度对7Ni钢组织和性能的影响 |
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| 引用本文： | 刘文斌,战国锋,黄峰.回火温度对7Ni钢组织和性能的影响[J].金属热处理,2020,45(12):63-68. |
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| 作者姓名： | 刘文斌 战国锋 黄峰 |
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| 作者单位： | 1.武汉科技大学 材料与冶金学院, 湖北 武汉 430081;2.宝钢中央研究院, 湖北 武汉 430080 |
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| 摘 要： | 利用OM、SEM、TEM和XRD试验方法,分析在两相区淬火+回火(QLT)工艺中,不同回火温度下7Ni钢组织形貌和逆转变奥氏体含量的变化,研究回火温度对7Ni钢低温强度和低温韧性的影响。结果表明:随着回火温度升高,7Ni钢抗拉强度逐渐提高,而低温韧性呈现先升高后降低的趋势。回火温度从560 ℃提高到620 ℃过程中,7Ni钢马氏体组织由粗大转变为均匀弥散细小,抗拉强度逐渐提高。当回火温度较低时,钢中马氏体回复不充分,析出的逆转变奥氏体量较少,低温韧性偏低。随着回火温度升高,7Ni钢逆转变奥氏体含量不断升高,但稳定性下降,大量不稳定的逆转变奥氏体在低温下发生转变,不利于钢低温韧性的改善。7Ni钢低温韧性随着回火温度升高呈现先升高后降低的趋势,并在580 ℃时获得最好的低温韧性。
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| 关 键 词： | 7Ni钢 回火 微观组织 低温力学性能 逆转变奥氏体 |
| 收稿时间： | 2020-07-12 |
Effect of tempering temperature on microstructure and properties of 7Ni steel |
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| Liu Wenbin,Zhan Guofeng,Huang Feng.Effect of tempering temperature on microstructure and properties of 7Ni steel[J].Heat Treatment of Metals,2020,45(12):63-68. |
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| Authors: | Liu Wenbin Zhan Guofeng Huang Feng |
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| Affiliation: | 1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;2. Research Institute of Baosteel, Wuhan Hubei 430080, China |
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| Abstract: | Changes of microstructure and reverse austenite content of 7Ni steel at different tempering temperatures during quenching, lamellarizing and tempering (QLT) were analyzed by means of OM, SEM, TEM and XRD, and the influence of tempering temperature on cryogenic strength and toughness of 7Ni steel was studied. The results show that with the increase of tempering temperature, the tensile strength of 7Ni steel increases gradually, while the low temperature toughness increases first and then decreases. In the process of tempering temperature increasing from 560 ℃ to 620 ℃, the martensite of the 7Ni steel changes from thick to uniform dispersion and fine, and the tensile strength of the steel gradually increases. When the tempering temperature is low, the martensite recovery in the steel is insufficient, the reverse austenite content is less, and the low temperature toughness is low. With the tempering temperature increasing, the reverse austenite content of the 7Ni steel increases continuously, but the stability decreases. A large number of unstable reversed austenite transforms at low temperature, which is detrimental to the improvement of low temperature toughness. The low temperature toughness of the 7Ni steel increases first and then decreases as the tempering temperature increases, and the best low temperature toughness is obtained at 580 ℃. |
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| Keywords: | 7Ni steel tempering microstructure cryogenic mechanical properties reverse austenite |
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