| 不同冷速对700MPa级汽车大梁钢过冷奥氏体转变的影响 |
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| 引用本文： | 赵楠,薛峰,潘进,郭维超,李建朝. 不同冷速对700MPa级汽车大梁钢过冷奥氏体转变的影响[J]. 金属热处理, 2021, 46(2): 178-181. DOI: 10.13251/j.issn.0254-6051.2021.02.032 |
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| 作者姓名： | 赵楠 薛峰 潘进 郭维超 李建朝 |
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| 作者单位： | 1.河钢集团钢研总院, 河北 石家庄 050000; 2.河北工业职业技术学院, 河北 石家庄 050000 |
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| 摘 要： | 在DIL805L型淬火膨胀仪上测定了一种700 MPa级汽车大梁钢(700L)的连续冷却转变曲线(CCT曲线),结合金相-硬度法分析其相变规律、相变组织及影响因素.结果表明:试验钢的临界点Ac3=898℃,Ac1=772℃;当冷速小于0.5℃/s时,过冷奥氏体的转变产物为铁素体、珠光体和少量贝氏体;当冷速大于0.5℃/...
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| 关 键 词： | 汽车大梁钢 连续冷却转变曲线 临界点 显微组织 硬度 |
| 收稿时间： | 2020-07-23 |
Effect of cooling rate on undercooling austenite transformation of 700 MPa automotive beam steel |
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| Zhao Nan,Xue Feng,Pan Jin,Guo Weichao,Li Jianchao. Effect of cooling rate on undercooling austenite transformation of 700 MPa automotive beam steel[J]. Heat Treatment of Metals, 2021, 46(2): 178-181. DOI: 10.13251/j.issn.0254-6051.2021.02.032 |
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| Authors: | Zhao Nan Xue Feng Pan Jin Guo Weichao Li Jianchao |
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| Affiliation: | 1. Hesteel Group Technology Research Institute, Shijiazhuang Hebei 050000, China; 2. Hebei College of Industry and Technology, Shijiazhuang Hebei 050000, China |
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| Abstract: | The continuous cooling transformation(CCT)curves of 700 MPa automotive beam steel 700 L were determined by using DIL805 L quenching dilatometer.Combined with metallography-hardness method,the phase transformation rules and microstructure as well as the influence factors were analyzed.The results show that the critical point of 700 L steel is Ac3=898℃,Ac1=772℃.The transformation product of undercooling austenite is ferrite,pearlite and bainite when the cooling rate is less than 0.5℃/s,then pearlite disappears when the cooling rate is more than 0.5℃/s,ferrite disappears and the transformation product is all bainite when the cooling rate is 5℃/s.A few martensite appears in the transformation products when the cooling rate is 10℃/s,and with the increase of cooling rate,martensite increases and bainite decreases gradually until totally disappears.The hardness of the steel gradually increases with the increase of cooling rate,and increases significantly at 10℃/s. |
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| Keywords: | automotive beam steel continuous cooling transformation(CCT)curve critical point microstructure hardness |
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