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| 焊接热循环对5Mn钢连续冷却过程中马氏体相变的影响 |
| Effect of welding thermal cycling on martensitic transformation in 5Mn steel during continuous cooling |
| 投稿时间：2017-05-03 |
| DOI： |
| 中文关键词: 海洋平台用钢 5Mn钢 焊接热循环 冷却速率 峰值温度 连续冷却 马氏体相变 |
| 英文关键词: offshore platform steel 5Mn steel welding thermal cycle cooling rate peak temperature continuous cooling martensite transformation |
| 基金项目:国家高技术研究发展计划(863计划)资助项目(2015AA03A501)；武汉科技大学教改项目(51501134). |
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| 中文摘要: |
| 利用热模拟试验测定海洋平台用5Mn钢在不同焊接热循环下的热膨胀曲线,结合显微组织观察,分析峰值温度和冷却速率对5Mn钢连续冷却过程中马氏体相变行为的影响。结果表明,在不同的焊接热循环下,5Mn钢室温组织均以板条马氏体为主；峰值温度为1320 ℃和850 ℃时的马氏体相变开始温度Ms的变化范围分别为371~395 ℃和397~423 ℃,且相同冷却速率下,峰值温度为850 ℃时的Ms高于峰值温度为1320 ℃时的Ms；此外,5Mn钢马氏体相变速率随着冷却速率的增大而增大,在相同冷速下,峰值温度为850 ℃时的马氏体相变速率大于峰值温度为1320 ℃时的相应值。 |
| 英文摘要: |
| The dilatometric curves of 5Mn steel used for offshore platform under different welding thermal cycles were determined by thermal simulation tests. Aided by microstructure observation, the effects of cooling rate and peak temperature on the martensite transformation behavior for 5Mn steel were reseached. The results show that under different welding heat cycles, the microstructure of 5Mn steel is mainly lath martensite, and the starting point of martensite transformation (Ms) at the peak temperature of 1320 ℃ and 850 ℃ varies from 371 ℃ to 395 ℃ and 397 ℃ to 423 ℃, respectively. At the same cooling rate, Ms measured at the peak temperature of 850 ℃ is higher than that measured at 1320 ℃. Moreover, the martensite transformation rate of 5Mn steel increases with the increase of cooling rate, and the rate of martensite transformation at the peak temperature of 850 ℃ is higher than that at the temperature of 1320 ℃ under the same cooling rate. |
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