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| 低碳微合金钢回火过程的组织演变规律 |
| Microstructural evolution of low-carbon micro-alloyed steel during tempering process |
| 投稿时间：2019-07-15 |
| DOI： |
| 中文关键词: 低碳微合金钢 回火 热膨胀 差式扫描量热法 析出 组织演变 显微硬度 |
| 英文关键词: low-carbon micro-alloyed steel tempering thermal expansion differential scanning calorimetry precipitation microstructural evolution microhardness |
| 基金项目:湖北省技术创新专项重大项目(2018AAA005)；HBIS集团技术研究院项目资助. |
| 作者 | 单位 | E-mail | | 袁飞 | 武汉科技大学耐火材料与冶金国家重点实验室,湖北 武汉,430081 | 741218104@qq.com | | 丁文红 | 武汉科技大学耐火材料与冶金国家重点实验室,湖北 武汉,430081 | | | 刘天武 | 河钢集团钢研总院,河北 石家庄,050023 | | | 孙力 | 河钢集团钢研总院,河北 石家庄,050023 | | | 张志强 | 河钢集团邯钢公司技术中心,河北 邯郸,056002 | | | 庞博文 | 武汉科技大学耐火材料与冶金国家重点实验室,湖北 武汉,430081 | |
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| 中文摘要: |
| 采用膨胀实验和差式扫描量热实验,结合SEM、TEM和显微硬度测试,研究了低碳微合金钢700L在回火过程中的组织演变规律。结果表明,700L钢回火过程包括5个阶段:渗碳体I的析出(50~200 ℃)、残余奥氏体的分解(200~300 ℃)、渗碳体II的析出(250~400 ℃)、合金碳化物的析出(450~580 ℃)和Mn的分配(580~650 ℃)。在2 ℃/min的升温速率下,钢中渗碳体析出、合金碳化物析出及Mn分配三个阶段存在明显的硬度改变,而且合金碳化物析出阶段试样的体积改变最显著,这可能是影响钢中残余应力演变的重要阶段。 |
| 英文摘要: |
| The microstructural evolution of low-carbon micro-alloyed steel 700L during tempering process was investigated by employing thermal expansion experiment and differential scanning calorimetry experiment, combined with SEM, TEM and microhardness test. The results show that the tempering process of 700L steel mainly consists of five stages:precipitation of cementite I (50~200 ℃), decomposition of retained austenite (200~300 ℃), precipitation of cementite II ( 250~400 ℃), precipitation of alloy carbides (450~580 ℃) and Mn partitioning (580~650 ℃). At the heating rate of 2 ℃/min, there is an obvious hardness change during the stages of cementite precipitation, alloy carbide precipitation and Mn partitioning. Moreover, the volume change of the steel sample during the alloy carbide precipitation stage is the most significant, which could be considered as the stage that affects the residual stress evolution most. |
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