| 正火冷速对2.25Cr-1Mo钢持久性能的影响 |
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| 引用本文： | 武志广,龚雪婷,李鑫,赵吉庆,韩少强,龚志华.正火冷速对2.25Cr-1Mo钢持久性能的影响[J].金属热处理,2020,45(6):55-59. |
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| 作者姓名： | 武志广 龚雪婷 李鑫 赵吉庆 韩少强 龚志华 |
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| 作者单位： | 1. 中国原子能科学研究院, 北京 102413;2. 钢铁研究总院 特殊钢研究所, 北京 100081 |
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| 摘 要： | 采用SEM、持久性能测试等手段,研究了不同正火冷速对2.25Cr-1Mo钢持久性能的影响。结果表明:当采用空冷、30 ℃/min、5 ℃/min冷却时,2.25Cr-1Mo钢在530 ℃的外推持久强度σ104均为120 MPa左右。当正火冷速降至1 ℃/min时,持久性能显著降低,主要因为此时在贝氏体-铁素体界面析出大量大颗粒析出物,导致蠕变孔洞产生;同时大量的先共析铁素体出现,基体强度降低,难以阻碍持久裂纹扩展,导致持久性能下降。
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| 关 键 词： | 2.25Cr-1Mo钢 持久性能 贝氏体 铁素体 |
| 收稿时间： | 2020-01-03 |
Effect of normalizing cooling rate on creep rupture property of 2.25Cr1Mo steel |
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| Wu Zhiguang,Gong Xueting,Li Xin,Zhao Jiqing,Han Shaoqiang,Gong Zhihua.Effect of normalizing cooling rate on creep rupture property of 2.25Cr1Mo steel[J].Heat Treatment of Metals,2020,45(6):55-59. |
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| Authors: | Wu Zhiguang Gong Xueting Li Xin Zhao Jiqing Han Shaoqiang Gong Zhihua |
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| Affiliation: | 1. China Institute of Atomic Energy, Beijing 102413, China;2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | Effect of different normalizing cooling rate on the creep rupture property of 2.25Cr-1Mo steel was studied by means of SEM and creep testing machine. The results show that the extrapolated creep strength σ104 under 530 ℃ of the 2.25Cr-1Mo steel normalized with air, 30 ℃/min and 5 ℃/min cooling rate are all about 120 MPa. The creep rupture strength decreases conspicuously when the cooling rate drops to 1 ℃/min, the main reason is a large number of big size particles precipitated on the interface of ferrite and bainite, which results in the occurrence of creep holes. Meanwhile, a large number of proeutectoid ferrite appears, which leads to the strength of the matrix decrease and can not effectively hinder cracks to propogate, thus the creep rupture property decreases. |
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| Keywords: | 2 25Cr-1Mo steel creep rupture property bainite ferrite |
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