真空分级淬火对<strong>8Cr4Mo4V</strong>钢组织和性能的影响

doi:10.11901/1005.3093.2022.062

材料研究学报

2022, Vol. 36

Issue (6): 443-453 DOI: 10.11901/1005.3093.2022.062

研究论文

本期目录 | 过刊浏览

真空分级淬火对8Cr4Mo4V钢组织和性能的影响

于兴福¹(

), 王盛宇², 王宇蓬³, 杨树新³, 杨宇⁴, 苏勇⁵, 冯小川³

^1.沈阳工业大学机械工程学院沈阳 110870
^2.沈阳工业大学材料科学与工程学院沈阳 110870
^3.中国航发哈尔滨轴承有限公司哈尔滨 150000
^4.中国航空发动机集团航空发动机动力传输重点实验室沈阳 110015
^5.沈阳化工大学机械与动力工程学院沈阳 110142

Effect of Vacuum Graded Quenching on Microstructure and Mechanical Properties of 8Cr4Mo4V Steel

YU Xingfu¹(

), WANG Shengyu², WANG Yupeng³, YANG Shuxin³, YANG Yu⁴, SU Yong⁵, FENG Xiaochuan³

^1.School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^3.AECC Harbin Bearing Co. Ltd., Harbin 150000, China
^4.Key Laboratory of Power Transmission Technology on Aero-Engine, Aero Engine Corporation of China, Shenyang 110015, China
^5.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

引用本文:

于兴福, 王盛宇, 王宇蓬, 杨树新, 杨宇, 苏勇, 冯小川. 真空分级淬火对8Cr4Mo4V钢组织和性能的影响[J]. 材料研究学报, 2022, 36(6): 443-453.
Xingfu YU, Shengyu WANG, Yupeng WANG, Shuxin YANG, Yu YANG, Yong SU, Xiaochuan FENG. Effect of Vacuum Graded Quenching on Microstructure and Mechanical Properties of 8Cr4Mo4V Steel[J]. Chinese Journal of Materials Research, 2022, 36(6): 443-453.

全文: PDF(18971 KB) HTML

摘要:

在真空条件下对航空轴承用8Cr4Mo4V钢进行不同温度的分级淬火并采用扫描电镜观察其微观组织、用XRD谱进行相分析并测试洛氏硬度、冲击性能和旋转弯曲疲劳性能,研究了真空分级淬火对其微观组织和力学性能的影响。结果表明,真空分级淬火后的8Cr4Mo4V钢其微观组织由下贝氏体、马氏体/残余奥氏体和碳化物组成；随着分级淬火温度的提高,淬火和回火态钢中析出碳化物的数量增加,残余奥氏体的含量降低。分级淬火温度为580℃时淬火态钢中贝氏体的含量最高(达到13.87%),残余奥氏体的含量为28.59%。回火后析出碳化物的含量和洛氏硬度均为所有分级温度中的最大值,分别为4.37%和62.38HRC。真空分级淬火能提高8Cr4Mo4V钢的综合力学性能。与未分级真空淬火相比,进行580℃×10 min真空分级淬火的8Cr4Mo4V钢的冲击韧性提高了23.3%,旋转弯曲疲劳极限提高了110 MPa。

关键词 ：金属材料, 8Cr4Mo4V钢, 真空分级淬火, 贝氏体, 力学性能

Abstract：

The 8Cr4Mo4V steel for aviation bearing manufacturing was subjected to graded quenching at different temperatures after being vacuum heat-treated. The effect of vacuum graded quenching on microstructure and mechanical properties of 8Cr4Mo4V steel were investigated by scanning electron microscope, XRD, Rockwell hardness tester, impact tester and rotational bending fatigue tester. Results show that the graded quenching 8Cr4Mo4V steel presents a microstructure of lower bainite, martensite/retained austenite and carbides. With the increase of graded quenching temperature, the number of precipitated carbides in the quenched and tempered steel increases, while the amount of retained austenite decreases. When the graded quenching temperature is 580℃, the bainite volume fraction of the quenched steel reaches a maximum of 13.87%, and the residual austenite volume fraction is 28.59%, and then after tempering, the precipitated carbides volume fraction and the Rockwell hardness reach the maximum namely 4.37% and 62.38 HRC respectively, in comparison to other desired graded quenching temperatures. The vacuum graded quenching can improve the comprehensive mechanical properties of 8Cr4Mo4V steel. In other word, the 580℃×10 min vacuum graded quenching treated 8Cr4Mo4V steel presents impact toughness and fatigue limit of rotational bending 23.3% and 110 MPa respectively higher than those of the traditional vacuum quenching treated ones.

Key words： metallic materials 8Cr4Mo4V steel vacuum graded quenching bainite mechanical properties

收稿日期: 2022-01-18

ZTFLH:

TG142.1

基金资助:辽宁省教育厅基金(LJ2019014)

作者简介: 于兴福,男,1976年生,博士

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表1 8Cr4Mo4V轴承钢的化学成分

图1 8Cr4Mo4V钢真空分级淬火和回火制度

图2 冲击试样和旋转弯曲疲劳试样的尺寸

图3 8Cr4Mo4V钢真空分级淬火样品的表面温度变化曲线

图4 8Cr4Mo4V钢真空淬火与回火后的微观组织

图5 不同温度真空分级淬火后8Cr4Mo4V钢的微观组织

图6 600℃×10 min真空分级淬火后8Cr4Mo4V钢中碳化物的形貌

表2 600℃×10 min真空分级淬火后8Cr4Mo4V钢中碳化物的类型

图7 在不同温度下真空分级淬火及回火后8Cr4Mo4V钢的微观组织

图8 分级温度不同的8Cr4Mo4V钢中析出碳化物的含量和平均尺寸

图9 分级温度不同的8Cr4Mo4V钢回火后二次碳化物的含量和平均尺寸

图10 经不同真空分级淬火后8Cr4Mo4V钢的XRD谱

图11 8Cr4Mo4V钢中的贝氏体标记

图12 8Cr4Mo4V钢中贝氏体的含量与分级温度的关系

图13 真空分级淬火温度不同的8Cr4Mo4V钢组织变化的示意图

图14 真空分级淬火与回火后8Cr4Mo4V钢的硬度

图15 经不同真空热处理后8Cr4Mo4V钢的冲击断口形貌

图16 经不同真空热处理后8Cr4Mo4V钢的S-N曲线

图17 经不同真空热处理后8Cr4Mo4V钢的旋转弯曲疲劳断口形貌

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