| 低冷却速度下700MPa级V，Ti微合金化高强钢组织和性能 |
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| 引用本文： | 刘成宝,许宝玉萘晓辉等.低冷却速度下700MPa级V，Ti微合金化高强钢组织和性能[J].中国冶金,2014,24(2):19-22. |
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| 作者姓名： | 刘成宝 许宝玉萘晓辉等 |
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| 作者单位： | 1． 莱芜钢铁集团有限公司技术研发中心， 山东 莱芜 271104 2． 东北大学轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳 110819 |
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| 基金项目： | 国家自然科学基金资助项目(51104044);高等学校博士学科点专项科研资金资助项目(20090042120004) |
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| 摘 要： | 采用光学显微镜、扫描电镜和透射电镜观察700MPa级钒微合金化低合金高强钢热轧后在3~5，1.5~2和0.3~0.5℃/s三个不同冷却速度下获得的微观组织，对晶粒度、珠光体体积分数、珠光体片层间距进行了定量分析，测定了拉伸性能并观察了拉伸断口。结果显示，冷却速度为1.5~2℃/s时产品性能最佳。这是因为该冷却速度下铁素体基体上纳米碳化物数量增加且弥散细小，析出强化效果随析出物数量呈线性增加。
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| 关 键 词： | 冷却速率 低合金高强钢 钒 碳化物析出 屈服强度 |
Microstructure and Property of 700MPa Grade V/Ti- Alloyed Steel at Lower Cooling Rate |
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| LIU Cheng-bao,XU Bao-yu,CAI Xiao-hui.Microstructure and Property of 700MPa Grade V/Ti- Alloyed Steel at Lower Cooling Rate[J].China Metallurgy,2014,24(2):19-22. |
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| Authors: | LIU Cheng-bao XU Bao-yu CAI Xiao-hui |
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| Affiliation: | （1．Technical R&D Center，Laiwu Iron & Steel Group Co．， Ltd．， Laiwu 271105， Shandong， China 2．State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， Liaoning， China） |
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| Abstract: | The microstructures of 700MPa grade V-bearing microalloyed high strength low alloy steel with different cooling rate of 3~5，1.5~2 and 0.3~0.5℃/s respectively after rolling were observed by optical microscopy，scanning electron microscopy and transmission electron microscope．The grain size，phase fraction of pearlite and the interlamellar spacing were obtained by quantitative metallographical examination．The tensile properties were measured and the fractures were analyzed．It showed that the properties of product is best with cooling rate 1.5~2℃/s，because the precipitation particles are much more than that with other cooling modes and the precipitation strengthening effect increased linearly with the precipitation amount． |
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| Keywords: | Cooling rate HSLA steel Vanadium carbide precipitate yield strength |
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