两次淬火对<strong>HSLA</strong>钢组织和冲击韧性的影响

doi:10.11901/1005.3093.2019.580

材料研究学报

2020, Vol. 34

Issue (9): 705-711 DOI: 10.11901/1005.3093.2019.580

研究论文

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两次淬火对HSLA钢组织和冲击韧性的影响

陈刚¹^,², 罗小兵¹(

), 柴锋¹, 杨才福¹, 张正延¹, 杨志刚²

1.钢铁研究总院工程用钢研究所北京 100081
2.清华大学材料科学与工程学院北京 100084

Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel

CHEN Gang¹^,², LUO Xiaobing¹(

), CHAI Feng¹, YANG Caifu¹, ZHANG Zhengyan¹, YANG Zhigang²

1. Department of Structure Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

引用本文:

陈刚, 罗小兵, 柴锋, 杨才福, 张正延, 杨志刚. 两次淬火对HSLA钢组织和冲击韧性的影响[J]. 材料研究学报, 2020, 34(9): 705-711.
Gang CHEN, Xiaobing LUO, Feng CHAI, Caifu YANG, Zhengyan ZHANG, Zhigang YANG. Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel[J]. Chinese Journal of Materials Research, 2020, 34(9): 705-711.

全文: PDF(15409 KB) HTML

摘要:

研究了两次淬火+回火和传统的一次淬火+回火热处理对HSAL钢的显微组织和力学性能的影响。结果表明，在不显著降低强度的条件下，两次淬火使实验钢的冲击功明显提高，还改善了低温韧性和稳定性。两次淬火回火热处理可细化钢的组织，使原始奥氏体晶粒的尺寸和有效晶粒尺寸减小、大角度界面的密度和解离裂纹的扩展偏折频率提高。组织的细化和大角度晶界的增多抑制了裂纹的扩展，使韧性大幅度提高。

关键词 ：金属材料, HSLA100钢, 两次淬火, 韧性, 大角度晶界, 裂纹扩展

Abstract：

The effect of double quenching and tempering (DQT) treatment as well as the conventional quenching and tempering (CQT) treatment on the microstructure and impact toughness of a high strength low alloy steel were investigated. The results show that compared with the CQT treatment, the impact toughness improved a lot, while the yield strength just slightly decreased for the DQT treated steel. These changes were characterized by optical microscope (OM), scanning electron microscope (SEM), electron back scatter diffraction (EBSD) and transmission electron microscope (TEM). It follows that in comparison to the CQT treatment, the DQT treatment led to a finer microstructure, namely, the size of prior austenite grain and the effective grain were refined, and the density of the high angle misorientation was increased, while the frequency of deflection for the crack propagation for the DQT treated steel was much higher than the CQT treated one. The superior toughness of the DQT treated steel can be attributed to the finer microstructure.

Key words： metallic materials HSLA double quenching toughness high-angle boundary crack propagation

收稿日期: 2019-12-12

ZTFLH:

TG142.1

作者简介: 陈刚，男，1989年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.580 或 https://www.cjmr.org/CN/Y2020/V34/I9/705

图1 传统热处理工艺和两次淬火热处理工艺图

表1 两种热处理工艺下实验钢力学性能

图2 两热处理工艺实验钢的冲击功和断面纤维率随温度的变化

图3 不同热处理工艺实验钢的淬火态显微组织

图4 不同热处理工艺实验钢的原始奥氏体晶粒尺寸

图5 不同热处理工艺实验钢的 EBSD晶界分布图和两工艺处理的实验钢晶界密度对比

图6 不同热处理工艺实验钢的铜析出粒子

图7 不同热处理工艺实验钢冲击断口的形貌

图8 不同热处理工工艺下实验钢主要裂纹的形貌

图9 DQT工艺实验钢的二次裂纹和主要裂纹扩展形貌

图10 两次淬火工艺冲击试样的裂纹扩展形貌

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