加热速率对铸态60Si2Mn钢奥氏体化的影响

王瑞章; 周登虎; 江雁; 杨凯; 席波; 廖振成; 黄贞益

doi:10.7513/j.issn.1004-7638.2022.02.025

加热速率对铸态60Si2Mn钢奥氏体化的影响

doi: 10.7513/j.issn.1004-7638.2022.02.025

1.
南京钢铁股份有限公司，江苏南京211500
2.
安徽工业大学冶金工程学院，安徽马鞍山 243000

基金项目: 安徽省高等学校自然科学研究项目（项目编号：KJ2019ZD07）

详细信息

作者简介:
王瑞章（1973—），男，江苏盐城人，本科，主要研究方向为棒材轧钢工艺，E-mail：wangruizhang@njsteel.com.cn

中图分类号: TF76
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-09
- 网络出版日期: 2022-05-11
- 刊出日期: 2022-04-28

Effect of heating rate on austenitization of as-cast 60Si2Mn steel

1.
Nanjing Iron & Steel Co., Ltd., Nanjing 211500, Jiangsu, China
2.
School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243000, Anhui, China

摘要

摘要: 利用DIL805A热膨胀仪记录了铸态60Si2Mn钢在不同的加热速率下（0.2、1、3、10、50 ℃/s）的线膨胀系数，获得了各自的热膨胀曲线和奥氏体体积转变分数曲线，研究了加热速率对奥氏体化的影响。采用高温金相显微镜对该钢在连续加热过程中的奥氏体转变过程进行了观察分析。结果表明：60Si2Mn钢在连续加热过程中的奥氏体转变可分为三个阶段：珠光体向奥氏体的转变、(Mn,Fe)₃C向奥氏体中的溶解和奥氏体的成分均匀化。随着加热速率提高，相变临界温度提高，相变速率提高。通过高温金相可以观察到，在连续加热过程中，铸态60Si2Mn钢的A转变是一个形核和长大交替进行的过程,并且由于Si元素含量的不同，导致这个过程是不连续的。
- 60Si2Mn钢 /
- 热膨胀曲线 /
- 奥氏体化 /
- 高温金相
Abstract: The linear expansion coefficient of as-cast 60Si2Mn steel at different heating rates (0.2, 1, 3, 10, 50 ℃/s) was recorded using the thermal dilatometer DIL805A. The corresponding thermal expansion curves and volume transformation fraction curves (austenite) were obtained to study the effect of heating rate on austenitization. A high-temperature metallurgical microscope was used to observe and analyze the austenite transformation process of the steel during continuous heating. Studies have shown that the austenite transformation of 60Si2Mn steel during continuous heating can be divided into three stages: the transformation of pearlite to austenite, the dissolution of (Mn,Fe)₃C into austenite and the composition of austenite homogenizing. And as the heating rate increases, the critical temperature of phase transition increases, and the rate of phase transition increases. In addition, high-temperature metallography shows that the A transformation of the as-cast 60Si2Mn steel during the continuous heating process is an alternate nucleation and growth process. This process is discontinuous due to the difference in Si element content.
- 60Si2Mn steel /
- thermal expansion curve /
- austenitization /
- high temperature metallography

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图 1 60Si2Mn钢连铸坯的显微组织特征

Figure 1. Microstructural characteristics of continuous casting billet of 60Si2Mn steel

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图 2 60Si2Mn钢在3 ℃/s加热速率下的典型热膨胀及膨胀率曲线

Figure 2. Typical thermal expansion curve (a) and expansion rate curve (b) of 60Si2Mn steel (heating rate at 3 °C/s)

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图 3 奥氏体转变分数求解(a)及(b)以3 ℃/s连续加热时奥氏体转变量及转变速率

Figure 3. (a) The numerical solution on the fraction of austenite transformed; (b) the austenite transformed fraction and the austenite-formation rate under continuous heating at 3 ºC/s

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图 4 不同连续加热速度下的热膨胀量曲线(a)、(b)；奥氏体转变分数（c）、（d）

Figure 4. Thermal expansion curves (a)，(b) and corresponding austenite transformation fractions (c)，(d) at different continuous heating rates

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图 5 加热速度对60Si2Mn钢奥氏体转变时间的影响(a)和(b)该钢的连续加热奥氏体转变动力学曲线

Figure 5. (a) Effect of heating rate on austenite transformation time of 60Si2Mn steel; and (b) the austenite transformation kinetics curve during continuous heating of 60Si2Mn steel

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图 6 60Si2Mn钢在连续加热过程中的相变前组织特征（加热速度约65 ℃/min）

Figure 6. Microstructure characteristics of 60Si2Mn steel before the phase transformation during continuous heating (heating rate at ~65 ℃/min)

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图 7 60 Si2 Mn钢在连续加热过程中的奥氏体的形核与长大

Figure 7. Austenite nucleation and growth in 60Si2Mn steel during continuous heating

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图 8 60Si2Mn钢在连续加热过程中的奥氏体晶粒的长大

Figure 8. Austenite grain growth of 60Si2Mn steel during continuous heating

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表 1 60Si2Mn主要化学成分

Table 1. Main chemical compositions of 60Si2Mn steel %

C Si Mn P S Cr Ni Cu

0.56～0.64 1.6～2.0 0.7～1.0 ≤0.025 ≤0.025 ≤0.35 ≤0.35 ≤0.25

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