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| 耐火钢Q420FRE的SH-CCT曲线及相变动力学研究 |
| SH-CCT curves and phase transformation kinetics of fire-resistant steel Q420FRE |
| 投稿时间：2016-09-20 |
| DOI： |
| 中文关键词: 耐火钢 Q420FRE SH-CCT 热影响区 冷却速率 贝氏体转变 相变速率 |
| 英文关键词: fire-resistant steel Q420FRE SH-CCT HAZ cooling rate bainite transformation phase transformation rate |
| 基金项目:国家自然科学基金资助项目(50734004)；南京钢铁股份有限公司技术开发项目(20150909). |
| 作者 | 单位 | E-mail | | 覃展鹏 | 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081
2. 武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081 | 2604371036@qq.com | | 王红鸿 | 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081
2. 武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081 | | | 任晓辉 | 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081
2. 武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081 | | | 吴开明 | 1. 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081
2. 武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081 | |
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| 中文摘要: |
| 利用热模拟试验测定耐火钢Q420FRE在不同焊接热循环下的热膨胀曲线,结合显微组织观察及硬度测试结果,绘制其焊接热影响区的连续冷却转变(SH-CCT)曲线,分析t8/5(从800 ℃到500 ℃的冷却时间)对试验钢组织、硬度及相转变速率的影响。结果表明,在较大的t8/5范围内,Q420FRE钢热影响区组织均以贝氏体为主,硬度(HV0.2)变化范围为185~208,与母材基本相当；试验钢具有较高的贝氏体转变温度,随着t8/5的减小(除50、80 s外),即冷却速率的增加,贝氏体相变开始温度和结束温度逐渐降低,相变速率增大,相变温度区间变化不明显；当t8/5为50、80 s时,相变速率有所降低,相变温度区间稍有增大。 |
| 英文摘要: |
| Through thermal simulation experiments, dilatometric curves of fire-resistant steel Q420FRE under different welding themal cycles were measured. Aided by microhardness test and microstructural analysis, the simulated HAZ continuous cooling transformation (SH-CCT) curves were obtained. The effects of t8/5 (cooling time from 800 ℃ to 500 ℃) on microstructure, microhardness and phase transformation rate of the steel were investigated. The results show that in a relatively wide range of t8/5, the microstructure of HAZ of Q420FRE steel consists mainly of bainite with the hardness (HV0.2) from 185 to 208, which is consistent with the base material. In addition, Q420FRE steel exhibits higher bainite transformation temperature than conventional bainite steels. With the increase of cooling rate, i.e., the decrease of t8/5 (besides 50 s and 80 s), the bainite transformation rate increases gradually, the start and finish temperatures of phase transformation decrease and the corresponding temperature range doesn’t change evidently. However, when t8/5 equals 50 s and 80 s, the phase transformation rate decreases and the phase transformation temperature range enlarges a little bit. |
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