| 1 200 MPa级HSLA钢的SH-CCT曲线及其热影响区组织与性能 |
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| 引用本文： | 徐彬,马成勇,李莉,齐彦昌,彭云.1 200 MPa级HSLA钢的SH-CCT曲线及其热影响区组织与性能[J].材料科学与工艺,2016,24(3):28-33. |
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| 作者姓名： | 徐彬 马成勇 李莉 齐彦昌 彭云 |
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| 作者单位： | 1. 昆明理工大学 材料科学与工程学院，昆明650093; 钢铁研究总院 焊接材料研究所，北京100081;2. 钢铁研究总院 焊接材料研究所,北京,100081;3. 昆明理工大学 材料科学与工程学院,昆明,650093 |
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| 摘 要： | 为在工程应用中对焊接工艺的合理选取与制定提供理论和试验依据,采用焊接热模拟技术研究了800~500℃冷却时间(t8/5)对1 200 MPa级低合金高强钢焊接热影响区粗晶区(CGHAZ)显微组织和性能的影响.结果表明:t8/5为6~20 s时,该钢热影响区的粗晶区组织为板条马氏体,硬度为477~456 HV5;随着冷却时间的延长,组织中开始出现板条贝氏体,在t8/5为60 s时硬度下降到380 HV5;当t8/5为60~600 s时,粗晶区组织为板条贝氏体和粒状贝氏体,硬度为380~300 HV5;t8/5600 s时粗晶区组织主要为粒状贝氏体,硬度为300~315 HV5.试验钢碳当量为0.626%,冷裂纹敏感系数为0.335%,说明其淬硬倾向较大,焊接热影响区容易产生裂纹.
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| 关 键 词： | 焊接热模拟 低合金高强钢 焊接热影响区 显微组织 硬度 |
| 收稿时间： | 2015/12/29 0:00:00 |
SH-CCT diagram, microstructures and properties of heat-affected zone of a 1 200 MPa grade HSLA steel |
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| XU Bin,MA Chengyong,LI Li,QI Yanchang and PENG Yun.SH-CCT diagram, microstructures and properties of heat-affected zone of a 1 200 MPa grade HSLA steel[J].Materials Science and Technology,2016,24(3):28-33. |
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| Authors: | XU Bin MA Chengyong LI Li QI Yanchang and PENG Yun |
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| Affiliation: | College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093, China ;The Welding Institute, China Iron and Steel Research Institute Group,Beijing 100081,China,The Welding Institute, China Iron and Steel Research Institute Group,Beijing 100081,China,College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093, China,The Welding Institute, China Iron and Steel Research Institute Group,Beijing 100081,China and The Welding Institute, China Iron and Steel Research Institute Group,Beijing 100081,China |
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| Abstract: | To provide theoretical and experimental basis for the proper selection of welding parameters in engineering application, the effect of cooling time from 800 to 500℃ (t8/5) on the microstructure and properties of the coarse grained heat affected zone (CGHAZ) of a 1 200 MPa grade HSLA steel was investigated by using the thermal simulation tests. The results indicate that the microstructure of the CGHAZ consisted of lath martensite with hardness 477~456 HV5 as t8/5 is 6~20 s. With prolonging cooling time, the lath bainite forms in the steel, and the hardness decreases to 380 HV5 as the t8/5 is 60 s. As t8/5 is 60~600 s, it shows a microstructure of lath granular bainites with hardness 380~300 HV5. When t8/5 is longer than 600 s, the CGHAZ mainly shows a microstructure of granular bainite with hardness of 300~315 HV5. The carbon equivalent and cold cracking susceptibity coefficient of this steel is 0. 626% and 0. 335%, respectively, indicating that the harden quenching tendency is strong and the cold crack can easily form in the HAZ of the steel. |
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| Keywords: | welding thermal simulation HSLA steel heat-affected zone microstructure hardness |
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