微量<strong>Ce</strong>元素对高铬高钴型马氏体耐热钢力学性能的影响

doi:10.11901/1005.3093.2021.236

材料研究学报

2022, Vol. 36

Issue (4): 261-270 DOI: 10.11901/1005.3093.2021.236

研究论文

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微量Ce元素对高铬高钴型马氏体耐热钢力学性能的影响

王琨¹^,², 杨仁贤¹^,², 蔡欣¹, 郑雷刚¹(

), 胡小强¹^,²(

), 李殿中¹^,²

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Effects of Trace Ce on Mechanical Properties of a Ferritic/Martensitic Heat Resistant Steel Containing High Cr and Co

WANG Kun¹^,², YANG Renxian¹^,², Cai Xin¹, ZHENG Leigang¹(

), HU Xiaoqiang¹^,²(

), LI Dianzhong¹^,²

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

王琨, 杨仁贤, 蔡欣, 郑雷刚, 胡小强, 李殿中. 微量Ce元素对高铬高钴型马氏体耐热钢力学性能的影响[J]. 材料研究学报, 2022, 36(4): 261-270.
Kun WANG, Renxian YANG, Xin Cai, Leigang ZHENG, Xiaoqiang HU, Dianzhong LI. Effects of Trace Ce on Mechanical Properties of a Ferritic/Martensitic Heat Resistant Steel Containing High Cr and Co[J]. Chinese Journal of Materials Research, 2022, 36(4): 261-270.

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摘要:

在不同条件下对X20Co高钴高铬型马氏体耐热钢进行热处理,用光学显微镜、扫描电镜、X射线衍射仪以及拉伸实验等手段进行表征,研究了微量Ce元素对其微观组织和力学性能的影响。结果表明,在X20Co钢的淬火过程中,添加质量分数为50×10^-6 Ce元素能促进M₆C型碳化物沿晶析出,阻碍晶界迁移,使奥氏体晶粒细化；在回火过程中能抑制M₂₃C₆型碳化物沿晶界聚集长大。同时,添加50×10^-6 Ce元素对X20Co高钴高铬型马氏体耐热钢的室温硬度、室温强度、高温瞬时拉伸强度没有显著的影响,但是使其室温韧性、塑性和高温塑性显著改善。

关键词 ：金属材料, 稀土, 耐热钢, 热处理组织, 韧塑性

Abstract：

High Co and Cr containing martensitic heat resisting steels of X20Co without and with trace Ce addition were heat treated under different conditions, then the effect of trace Ce on the microstructure and mechanical properties of the steels were investigated by means of optical microscope, scanning electron microscope, X-ray diffractometer and tensile tester. The results show that in the quenching process, the addition of 50×10^-6 Ce can promote the precipitation of M₆C type carbides along the grain, therewith hinder the grain boundary migration, and make the refinement of austenite grains; As a consequence, the accumulation and growth of M₂₃C₆ type carbides along grain boundaries can be inhibited during tempering process. At the same time, the addition of 50×10^-6 Ce has no significant effect on the hardness, strength and high temperature instantaneous tensile strength, but the toughness and plasticity at room temperature as well as the high temperature plasticity are significantly improved for the high Co and Cr containing martensitic steel X20Co.

Key words： metallic materials rare earth heat resistant steel microstructure toughness and plasticity

收稿日期: 2021-04-15

ZTFLH:

TG142.1

基金资助:国家自然科学基金(51871212);国家重点研发计划(2020YFB2006800);中国科学院青年创新促进会人才专项(2017237);中国科学院王宽诚率先人才计划“产研人才扶持项目”,中国科学院战略性先导专项(XDC04000000);江西省重大科技专项(20194ABC28011)

作者简介: 王琨,男,1995年生,硕士生

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表1 X20Co和X20CoRE耐热钢的成分

图1 X20Co和X20CoRE耐热钢在不同温度淬火后的组织

图2 X20Co和X20CoRE耐热钢不同温度淬火后的XRD谱

图3 X20Co和X20CoRE耐热钢在不同温度淬火后的平均晶粒尺寸

图4 X20Co和X20CoRE耐热钢在不同温度回火后的SEM照片

表2 实验钢中的析出相和基体的SEM-EDS能谱分析结果

图5 X20Co 和X20CoRE耐热钢在不同温度回火后的XRD谱

图6 X20Co和X20CoRE耐热钢的室温力学性能

图7 X20Co和X20CoRE耐热钢的高温拉伸性能

图8 X20Co耐热钢中析出相的质量分数随温度的变化

图9 X20Co和X20CoRE耐热钢高温拉伸断口的形貌

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