钒微合金化中锰马氏体耐磨钢奥氏体晶粒长大行为

doi:10.11900/0412.1961.2021.00560

金属学报

2022, Vol. 58

Issue (12): 1589-1599 DOI: 10.11900/0412.1961.2021.00560

研究论文

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钒微合金化中锰马氏体耐磨钢奥氏体晶粒长大行为

韩汝洋¹, 杨庚蔚¹(

), 孙新军², 赵刚¹, 梁小凯², 朱晓翔¹

^1.武汉科技大学耐火材料与冶金国家重点实验室武汉 430081
^2.钢铁研究总院工程用钢研究所北京 100053

Austenite Grain Growth Behavior of Vanadium Microalloying Medium Manganese Martensitic Wear-Resistant Steel

HAN Ruyang¹, YANG Gengwei¹(

), SUN Xinjun², ZHAO Gang¹, LIANG Xiaokai², ZHU Xiaoxiang¹

^1.State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Department of Structrual Steels, Central Iron and Steel Research Institute, Beijing 100053, China

引用本文:

韩汝洋, 杨庚蔚, 孙新军, 赵刚, 梁小凯, 朱晓翔. 钒微合金化中锰马氏体耐磨钢奥氏体晶粒长大行为[J]. 金属学报, 2022, 58(12): 1589-1599.
Ruyang HAN, Gengwei YANG, Xinjun SUN, Gang ZHAO, Xiaokai LIANG, Xiaoxiang ZHU. Austenite Grain Growth Behavior of Vanadium Microalloying Medium Manganese Martensitic Wear-Resistant Steel[J]. Acta Metall Sin, 2022, 58(12): 1589-1599.

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摘要:

利用热模拟试验机、OM和TEM研究了钒微合金化中锰马氏体耐磨钢的奥氏体晶粒长大行为，分析了不同加热温度和保温时间下第二相粒子的形貌、尺寸和粒径分布及其与奥氏体晶粒长大行为的交互作用。结果表明，在820℃保温10 s时，试样的平均奥氏体晶粒尺寸为3.98 μm，继续保温3600 s后仅长大1.47 μm，具有较强的抗粗化能力。这是因为基体中细小的V(C, N)粒子钉扎奥氏体晶界，抑制了奥氏体晶粒的长大。随着保温温度升高和时间的增加，V(C, N)粒子发生溶解和粗化，钉扎能力减弱，奥氏体晶粒快速长大。利用增加时间指数的新型Sellars模型，通过预设误差函数的新型计算方法，建立了两段奥氏体长大模型，其与传统Beck模型相比，预测精度大幅度提升。

关键词 ：中锰马氏体耐磨钢, V(C, N)析出, 钉扎力, 晶粒长大, 奥氏体晶粒长大模型

Abstract：

Medium manganese martensitic wear-resistant steel is a new type of wear-resistant steel with high hardenability and hardness; moreover, the controlling austenite grain size is of great significance for improving its comprehensive properties. In this study, the austenite growth behavior of vanadium microalloying medium manganese martensitic wear-resistant steel was systematically investigated using the Gleeble-3500 thermal simulation testing machine, OM, and HRTEM. The morphology, size, and particle size distribution of the second phase particles at different heating temperatures and holding times were analyzed. The influence of second phase particles on the growth behavior in austenite was also revealed. The results showed that the ultra-fine austenite grains with grain size of 3.98 μm were obtained when the sample was held at 820^oC for 10 s. After holding for 3600 s, the average grain size of austenite only increased by 1.47 μm, and the austenite grains showed a strong ability to resist coarsening at 820^oC. This could be attributed to the fine V(C, N) particles which could pin the austenite grain boundary and inhibit the growth of austenite grains. Furthermore, when reheating temperatures and holding times increase, the dissolution and coarsening of V(C, N) particles lead to the decrease of pining ability and then to the rapid growth of austenite. A new Sellars model with a time index was used to establish austenite growth model using a new method with a predetermined error function. The accuracy of the prediction for austenite grain sizes with new Sellars model was greatly improved compared with the traditional Beck model.

Key words： medium manganese martensitic wear-resistant steel V(C, N) precipitation pinning pressure grain growth austenitic grain growth model

收稿日期: 2021-12-14

ZTFLH:

TG142.1

基金资助:国家重点研发计划项目(2017YFB0305100);湖北省重点研发计划项目(2020BAB057)

作者简介: 韩汝洋，男，1992年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00560 或 https://www.ams.org.cn/CN/Y2022/V58/I12/1589

图1 试样制备与热处理工艺示意图

图2 试样在不同温度下保温3600 s后的OM像

图3 试样中奥氏体平均晶粒尺寸随加热温度变化曲线

图4 试样在820和950℃下保温不同时间的OM像

图5 试样在不同温度下奥氏体平均晶粒尺寸随保温时间的变化

图6 经不同温度保温600 s后试样中第二相粒子TEM像及EDS

图7 球形和短棒状第二相粒子的HRTEM像和快速Fourier变换谱

图8 经不同温度保温1800和3600 s后试样中第二相粒子形貌

图9 试样中V(C, N)粒子的平均直径随温度的变化

图10 不同温度下保温600、1800和3600 s后每平方微米内粒子数及第二相粒子直径分布图

表1 不同温度下保温600、1800和3600 s后试样中第二相粒子体积分数 (volume fraction / %)

图11 第二相粒子产生的钉扎力与温度的关系

图12 不同温度阶段的误差随晶粒生长指数(n)的变化

图13 不同加热温度范围内ln(Dtn - D0n)与lnt和1 / T的线性拟合关系

图14 不同奥氏体长大模型的预测值与实验值比较

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