调质热处理对不同轧制温度的含<strong>Cu</strong>低合金高强钢力学性能的影响

doi:10.11901/1005.3093.2024.245

材料研究学报

2025, Vol. 39

Issue (6): 401-412 DOI: 10.11901/1005.3093.2024.245

研究论文

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调质热处理对不同轧制温度的含Cu低合金高强钢力学性能的影响

王恒霖¹, 丁汉林¹(

), 柴锋², 罗小兵², 王子健¹, 项重辰¹

^1.苏州大学沙钢钢铁学院苏州 215006
^2.钢铁研究总院工程用钢研究所北京 100081

Effect of Quenched-tempered Heat Treatment on Microstructure and Precipitation of High Strength Low Alloy Steel Containing Copper After Being Hot Rolled at Different Temperatures

WANG Henglin¹, DING Hanlin¹(

), CHAI Feng², LUO Xiaobing², WANG Zijian¹, XIANG Chongchen¹

^1.School of Iron and Steel, Soochow University, Suzhou 215006, China
^2.Department of Structure Steels, Central Iron and Steel Research Institute, Beijing 100081, China

引用本文:

王恒霖, 丁汉林, 柴锋, 罗小兵, 王子健, 项重辰. 调质热处理对不同轧制温度的含Cu低合金高强钢力学性能的影响[J]. 材料研究学报, 2025, 39(6): 401-412.
Henglin WANG, Hanlin DING, Feng CHAI, Xiaobing LUO, Zijian WANG, Chongchen XIANG. Effect of Quenched-tempered Heat Treatment on Microstructure and Precipitation of High Strength Low Alloy Steel Containing Copper After Being Hot Rolled at Different Temperatures[J]. Chinese Journal of Materials Research, 2025, 39(6): 401-412.

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摘要:

在不同温度轧制含Cu低合金高强钢并使用SEM、TEM、STEM-HAADF和SAXS等手段对其表征，研究了调质热处理对其显微组织和力学性能的影响。研究表明，在不同温度轧制的热轧态含Cu低合金高强钢的组织为铁素体+贝氏体，调质热处理后其基体组织转变为回火马氏体，并析出了大量弥散分布的纳米富Cu相粒子和Cr碳化物。调质态含Cu低合金高强钢中的富Cu相粒子以孪晶9R型和非孪晶9R型方式析出。调质处理显著提高了这种钢的屈服强度和低温冲击韧性(尤其是在-84 ℃)，但是其抗拉强度略有降低。富Cu相粒子的析出是这种钢综合力学性能提高的主要原因。

关键词 ：金属材料, 轧制温度, 调质热处理, 富Cu析出相

Abstract：

The effect of heat treatments including quenching and tempering on the microstructure and mechanical properties of Cu-bearing high strength low alloy steel after being hot rolled at different temperatures were studied by SEM, TEM, STEM-HAADF and SASX. The results show that after being hot rolled at different temperatures, the test steels presented a microstructure of ferrite + bainite, however, which after quenching and tempering transformed to tempered martensite and a large amount of dispersed nano precipitates as their primary microstructure characteristics. The nano precipitates mainly consist of Cu-rich particles and Cr carbides. The results of TEM observation show that two types of precipitation modes, i.e. 9R precipitates with or without twins, can be found for the precipitation of Cu-rich particles in the test steel. The ambient temperature yield strength and low temperature impact toughness (especially at -84 ^oC) of the test steel can be significantly improved by quenching and tempering treatment, while the ultimate tensile strength is slightly decreased. The improvement in comprehensive mechanical properties of the test steel may be mainly ascribed to the precipitation of Cu-rich particles.

Key words： metallic materials rolling temperature quenched-tempered heat treatment Cu-rich precipitation

收稿日期: 2024-05-31

ZTFLH:

TG335.3

基金资助:国家自然科学基金(52174367);江苏省研究生科研实践创新项目(KYCX23_3239)

通讯作者: 丁汉林，教授，dinghanlin@suda.edu.cn，研究方向为高性能轻型金属材料开发与应用、金属材料强韧化机理

Corresponding author: DING Hanlin, Tel: 18896736263, E-mail: dinghanlin@suda.edu.cn

作者简介: 王恒霖，男，1996年生，博士生

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表1 实验用钢的化学成分

表2 热轧态R1~R6试样的力学性能

表3 调质态T1~T6试样的力学性能

图1 热轧态试样和调制态试样的显微组织

图2 用JMatPro软件计算的实验用的相变温度和第二相析出温度

图3 R1和R6试样中析出相的TEM照片

图4 T1和T6试样的基体组织和析出相的TEM照片

图5 T1试样的STEM照片和EDS能谱分析

图6 T6试样中第二相粒子的STEM照片和EDS能谱分析

图7 R1试样中析出相的TEM照片和EDS能谱分析

图8 T1和T6试样的选区电子衍射(SAED)照片

图9 T1和T6试样的STEM-HRTEM图像和FFT图

图10 T1和T6试样的小角X射线散射(SAXS)谱

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