17-4PH不锈钢表面仿生梯度硬度高强层组织与性能
Organization and properties of the surface bionic gradient hardness high strength layer of 17-4PH stainless steel
姚建洮 1高成 1李俊强 1刘晓刚2
作者信息
- 1. 西安石油大学 材料科学与工程学院,西安 710065
- 2. 陕西省机械研究院,咸阳 712000
- 折叠
摘要
本文拟在 17-4PH不锈钢表面制备高硬度耐磨层,为缓解高硬度堆焊层与基体间的开裂问题,提出制备仿生梯度硬度表面堆焊结构.采用手工电弧焊在 17-4PH不锈钢表面制备仿生梯度硬度高强层,选用D322焊条和D707焊条分别做过渡层和高强层在 17-4PH不锈钢表面进行仿生梯度硬度高强层的制备,采用光学显微镜、维氏硬度计、X射线衍射仪、冲击试验机对高强层的微观组织、显微硬度等性能进行了表征.结果表明:在 17-4PH不锈钢表面所制备的仿生梯度硬度高强层组织均匀,界面冶金结合良好;仿生梯度硬度高强层组织主要为马氏体、奥氏体、WC及碳化物;仿生梯度硬度高强层相结构主要由Fe-Cr、WC、γ-Fe组成,平均硬度为HV0.5 726.5,较基板有明显的提高;17-4PH不锈钢表面仿生梯度硬度高强层平均冲击吸收功为12.90 J,其冲击吸收功降低的主要原因是由于各层之间的性能不同所导致.
Abstract
In this paper,it is proposed to prepare a high hardness wear-resistant layer on the surface of 17-4PH stainless steel,and in order to alleviate the problem of cracking between the high hardness cladding layer and the substrate,it is proposed to prepare a bionic gradient hardness surface cladding structure.The use of manual elec-tric arc welding in the 17-4PH stainless steel surface preparation of bionic gradient hardness high strength layer,the choice of D322 electrode and D707 electrode were used as a transition layer and high strength layer in the 17-4PH stainless steel surface for the preparation of the bionic gradient hardness high strength layer,the use of optical microscopy,Vickers hardness tester,X-ray diffractometer,impact testing machine on the high strength layer of the microstructure,microhardness and other properties were characterization.The results show that the bionic gradient hardness high-strength layer prepared on the surface of 17-4PH stainless steel has a uniform organization and good interfacial metallurgical bonding.The organization of the bionic gradient hardness high-strength layer mainly consists of martensite,austenite,WC and carbide.The bionic gradient hardness high-strength layer phase structure mainly consists of Fe-Cr,WC,γ-Fe,with an average hardness of HV0.5 726.5,which is a significant improve-ment compared with that of the substrate.The bionic gradient hardness high-strength layer on the surface of 17-4PH stainless steel is also a good example of a bionic gradient hardness layer.17-4PH stainless steel surface bionic gradient hardness high-strength layer average impact absorption power is 12.90 J,the main reason for the reduc-tion of its impact absorption power is due to the different properties between the layers.
关键词
17-4PH不锈钢/仿生结构/梯度硬度/高强层/过渡层/显微组织Key words
17-4PH stainless steel/biomimetic structure/gradient hardness/high tensile layer/transition layer/microstructure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据