淬火温度对含铜<strong>5Cr15MoV</strong>马氏体不锈钢性能的影响

doi:10.11901/1005.3093.2021.214

材料研究学报

2021, Vol. 35

Issue (12): 933-941 DOI: 10.11901/1005.3093.2021.214

研究论文

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淬火温度对含铜5Cr15MoV马氏体不锈钢性能的影响

郝欣欣¹^,², 席通²(

), 张宏镇², 杨春光², 杨柯²

^1.中国科学技术大学材料科学与工程学院沈阳 110016
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Effect of Quenching Temperature on Microstructure and Properties of Cu-bearing 5Cr15MoV Martensitic Stainless Steel

HAO Xinxin¹^,², XI Tong²(

), ZHANG Hongzhen², YANG Chunguang², YANG Ke²

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

郝欣欣, 席通, 张宏镇, 杨春光, 杨柯. 淬火温度对含铜5Cr15MoV马氏体不锈钢性能的影响[J]. 材料研究学报, 2021, 35(12): 933-941.
Xinxin HAO, Tong XI, Hongzhen ZHANG, Chunguang YANG, Ke YANG. Effect of Quenching Temperature on Microstructure and Properties of Cu-bearing 5Cr15MoV Martensitic Stainless Steel[J]. Chinese Journal of Materials Research, 2021, 35(12): 933-941.

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摘要:

将含铜5Cr15MoV马氏体不锈钢在不同温度热处理并使用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)、硬度测试和电化学测试等手段对其表征，研究了淬火温度对其组织、硬度以及耐蚀性能的影响。结果表明，铜元素的添加提高了材料中残余奥氏体的体积分数，而使其硬度降低。淬火后钢中的未溶碳化物为fcc结构的富铬M₂₃C₆型碳化物，铜元素的添加对5Cr15MoV马氏体不锈钢中碳化物的尺寸和形貌没有明显的影响，但是使其耐蚀性能略微降低。随着淬火温度从1000℃提高到1100℃，未溶碳化物逐渐减少，耐蚀性提高。残余奥氏体的含量也随着淬火温度的提高而增多，碳化物与残余奥氏体的共同作用使淬火后钢的硬度曲线呈抛物线状并在1050℃达到最大值。

关键词 ：金属材料, 含铜5Cr15MoV马氏体不锈钢, 微观组织, 硬度, 耐蚀性能

Abstract：

The Cu-bearing martensitic stainless steel 5Cr15MoV was heat treated at different temperatures for 30 min and then oil quenched. The effect of quenching temperature on the microstructure, hardness and corrosion resistance of the steel were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), hardness tester and electrochemical test. The results show that the addition of Cu increases the volume fraction of residual austenite and decreases the hardness of the steel, the undissolved carbides in the quenched steel are Cr rich M₂₃C₆ type carbides with FCC structure, and the addition of Cu has no obvious effect on the size and morphology of the carbides in the 5Cr15MoV martensitic stainless steel, but its corrosion resistance is slightly reduced. With increase of the quenching temperature from 1000^oC to 1100^oC the undissolved carbides decrease, while the corrosion resistance of the steel increases. Meanwhile, the content of residual austenite also increases with the increase of quenching temperature. The combined action of carbide and residual austenite makes the hardness versus temperature curve of the quenched steel a parabolic shape with a maximum value at 1050°C.

Key words： metallic materials Cu-bearing 5Cr15MoV martensitic stainless steel microstructure hardness corrosion resistance

收稿日期: 2021-04-02

ZTFLH:

TG161

基金资助:佛山市中医院攀峰项目(202000206);沈阳市科技计划项目(20-203-5-21);中国科学院青年创新促进会项目(2018221)

作者简介: 郝欣欣，女，1996年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.214 或 https://www.cjmr.org/CN/Y2021/V35/I12/933

表1 实验用钢的化学成分(质量分数，%)

Characteristic diffraction line	G
(200)γ/(200) $α'$	2.423
(220)γ/(200) $α'$	1.274
(311)γ/(200) $α'$	1.446
(200)γ/(211) $α'$	1.331
(220)γ/(211) $α'$	0.6955
(311)γ/(211) $α'$	0.7939

表2 计算奥氏体含量时G的取值

图1 5Cr15MoV-4.13Cu在1000℃、1025℃、1050℃、1075℃、1100℃淬火后和5Cr15MoV在1050℃淬火后的光学显微组织

图2 5Cr15MoV、5Cr15MoV-2.81Cu和5Cr15MoV-4.13Cu在不同温度淬火后的XRD谱和残余奥氏体的含量

图3 5Cr15MoV-4.13Cu在1000℃、1025℃、1050℃、1075℃、1100℃淬火后和5Cr15MoV在1050℃淬火后的SEM照片

图4 在1050℃淬火后5Cr15MoV-4.13Cu中碳化物的XRD谱

图5 在1050℃淬火后5Cr15MoV的TEM照片

图6 5Cr15MoV-4.13Cu在1050℃淬火后的TEM照片

图7 在不同温度淬火后实验钢的硬度

图8 在不同温度淬火后5Cr15MoV的电化学极化曲线

表3 在不同温度淬火后5Cr15MoV的电化学参数

图9 在1050℃淬火后不同Cu含量5Cr15MoV的电化学极化曲线

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