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| 核电SA508-3钢焊接连续冷却转变曲线的分析 | |
| 引用本文： | 迟露鑫,麻永林,邢淑清,赵勇桃,陈芙蓉,陈重毅.核电SA508-3钢焊接连续冷却转变曲线的分析[J].焊接学报,2011,32(5):61-64. |
| 作者姓名： | 迟露鑫 麻永林 邢淑清 赵勇桃 陈芙蓉 陈重毅 |
| 作者单位： | 1. 内蒙古工业大学材料科学与工程学院,呼和浩特010051;内蒙古科技大学材料与冶金学院,内蒙古包头014010 2. 内蒙古科技大学材料与冶金学院,内蒙古包头,014010 3. 内蒙古工业大学材料科学与工程学院,呼和浩特,010051 |
| 基金项目： | 国家科技重大专项子课题 |
| 摘 要： | 针对首次应用到核电上的SA508-3钢,在Gleeblei500D热模拟机上,采用膨胀法测定了SH-CCT曲线,获得了焊接工艺特征参数t8/5从3.75～20 000 s范围内的焊接热影响区组织变化规律.结果表明,获得全部马氏体相变的冷却时间为15 s,全部贝氏体相变的冷却时间60 8＜t8/5≤3 000 s,全部铁素体和珠光体相变的冷却时间为6000 s;当t8/5≤100 s时,焊接热影响区硬度高于350 HV,存在淬硬和裂纹敏感性;当t8/5≥20 000 B时,焊接热影响区硬度小于母材硬度,易出现软化现象. |
| 关 键 词： | 核电SA508-3钢 冷却速度 焊接连续转变冷却曲线 裂纹敏感性 |
| 收稿时间： | 2009/12/29 0:00:00 |
Analysis on continuous cooling transformation curves of simulated heat affected zone for SA508-3 steel in nuclear power |
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| CHI Luxin,MA Yonglin,XING Shuqing,ZHAO Yongtao,CHEN Furong and CHEN Zhongyi.Analysis on continuous cooling transformation curves of simulated heat affected zone for SA508-3 steel in nuclear power[J].Transactions of The China Welding Institution,2011,32(5):61-64. | |
| Authors: | CHI Luxin MA Yonglin XING Shuqing ZHAO Yongtao CHEN Furong and CHEN Zhongyi |
| Affiliation: | School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China;School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China,School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China,School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China,School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China,School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China and School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China |
| Abstract: | The SA508-3 steel used in nuclear power was used to determine continuous cooling transformation(SH-CCT) diagram of simulated heat affected zone(HAZ) by thermal expansion method on Gleeble 1500D thermal simulation testing machine,and the microstructure characteristics of HAZ at t8/5 from 3.75 s to 20 000 s were investigated.It was found that the microstructures were changed much from the base metal because of the influence of the cooling time(t8/5).When the t8/5 is less than 15 s,the phase transformation to obtain all martensite happens,the cooling time range to get all the bainite is from 60 s to 3 000 s,and if all the ferrite,and pearlite can be obtained if the t8/5 is more than 6 000 s.The hardness of HAZ is higher than 350 HV and there are harden quenching tendency and the crack sensitivity when the t8/5 is less than 100 s,softening phenomena easily happens and the hardness of HAZ is lower than that of the base metal when the t8/5 is more than 20 000 s.The cold cracking can be avoided only at the proper preheating temperature. |
| Keywords: | SA508-3 steel cooling rate continuous cooling transformation curves crack sensitivity |
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