直接激光沉积Fe-Cr-Ni梯度合金钢的组织与性能

doi:10.13251/j.issn.0254-6051.2023.02.001

金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 1-9.DOI: 10.13251/j.issn.0254-6051.2023.02.001

• 组织与性能 • 下一篇

直接激光沉积Fe-Cr-Ni梯度合金钢的组织与性能

战娣¹, 陈岁元¹, 宋修文¹, 陈雪婷¹, 王玫²

1.东北大学材料与工程学院材料各向异性与织构教育部重点实验室, 辽宁沈阳 110819;
2.沈阳大陆激光技术有限公司技术部, 辽宁沈阳 110316

收稿日期:2022-09-02 修回日期:2022-12-09 出版日期:2023-02-25 发布日期:2023-03-22
通讯作者: 陈岁元,教授, 博士生导师,E-mail:chensy@smm.neu.edu.cn
作者简介:战娣(1997—),女,硕士研究生,主要研究方向为激光增材制造,E-mail:18230366583@163.com。
基金资助:
国家重点研发计划(2016YFB1100201);工信部绿色制造系统集成项目(2017-53);沈阳市“揭榜挂帅”项目(22-101-0-16)

Microstructure and properties of Fe-Cr-Ni gradient alloy steel by direct laser deposition

Zhan Di¹, Chen Suiyuan¹, Song Xiuwen¹, Chen Xueting¹, Wang Mei²

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials and Engineering, Northeastern University, Shenyang Liaoning 110819, China;
2. Technology Department, Shenyang Dalu Laser Technology Co., Ltd., Shenyang Liaoning 110316, China

Received:2022-09-02 Revised:2022-12-09 Online:2023-02-25 Published:2023-03-22

摘要/Abstract

摘要： 采用直接激光沉积技术制备了具有外强内韧组织性能的12CrNi2Y-50Cr6Ni2Y-70Cr8Ni2Y梯度合金钢试样,利用光学显微镜、扫描电镜、透射电镜、硬度计、摩擦试验机等分析手段,对直接激光沉积的梯度合金钢试样的组织结构、界面结合性、硬度梯度分布及耐磨性等进行了研究。结果表明,在优化的激光沉积参数下,成功制备出了无裂纹夹杂缺陷、梯度过渡界面处呈现冶金结合的12CrNi2Y-50Cr6Ni2Y-70Cr8Ni2Y梯度合金钢试样。梯度合金钢的组织呈现出由粒状贝氏体+板条贝氏体+少量马氏体→板条贝氏体+板条马氏体→板条马氏体+片状马氏体的变化趋势,对应硬度呈356 HV0.2→551 HV0.2→712 HV0.2梯度分布,体积磨损率呈现2.01×10^-4 mm³·N^-1·m^-1→1.33×10^-4 mm³·N^-1·m^-1→0.71×10^-4 mm³·N^-1·m^-1的梯度变化。制备的梯度合金钢试样中,由于C与Cr含量增加,试样硬度呈现了由低到高的梯度分布,表面工作层的耐磨性提高了近2.8倍,获得了外强内韧、呈梯度分布的组织与性能;梯度合金钢试样过渡界面附近小尺寸C原子发生了明显的元素扩散,促进了梯度界面的冶金结合。

关键词: 直接激光沉积, 梯度合金钢, 组织演变, 硬度梯度分布, 冶金结合

Abstract: An outside-strong but inside-tough 12CrNi2Y-50Cr6Ni2Y-70Cr8Ni2Y gradient alloy steel specimen was prepared by direct laser deposition technology. Then the microstructure, interfacial adhesion, hardness gradient distribution and wear resistance of the specimen were studied by means of metallographic microscope, scanning electron microscope, transmission electron microscope, hardness tester and friction testing machine. The results show that the 12CrNi2Y-50Cr6Ni2Y-70Cr8Ni2Y gradient alloy steel specimen with metallurgical bonding at the gradient transition interface and no crack inclusion defects is successfully prepared under the optimized laser deposition parameters. The microstructure of the specimen shows a change trend from (granular bainite+lath bainite+a small amount of martensite) to (lath bainite+lath martensite) to (lath martensite+plate martensite), the corresponding hardness changes as gradient distribution of 356 HV0.2 → 551 HV0.2 →712 HV0.2, and the volume wear rate as gradient distribution of 2.01×10^-4 mm³·N^-1·m^-1 → 1.33×10^-4 mm³·N^-1·m^-1 → 0.71×10^-4 mm³·N^-1·m^-1. In the prepared gradient alloy steel specimen, due to the increase of C and Cr content, the hardness of the specimen shows a gradient distribution from low to high, and the wear resistance of the surface working layer is improved by nearly 2.8 times, so the outside-strong but inside-tough requirements is realized by gradient distributions of microstructure and properties. The obvious element diffusion of small-size C atoms near the transition interface of gradient alloy steel specimen promotes the metallurgical bonding of gradient interface.

Key words: direct laser deposition, gradient alloy steel, microstructure evolution, hardness gradient distribution, metallurgical bonding

中图分类号:

TG142.2

战娣, 陈岁元, 宋修文, 陈雪婷, 王玫. 直接激光沉积Fe-Cr-Ni梯度合金钢的组织与性能[J]. 金属热处理, 2023, 48(2): 1-9.

Zhan Di, Chen Suiyuan, Song Xiuwen, Chen Xueting, Wang Mei. Microstructure and properties of Fe-Cr-Ni gradient alloy steel by direct laser deposition[J]. Heat Treatment of Metals, 2023, 48(2): 1-9.

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直接激光沉积Fe-Cr-Ni梯度合金钢的组织与性能

Microstructure and properties of Fe-Cr-Ni gradient alloy steel by direct laser deposition

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