17-4PH 不锈钢表面仿生梯度硬度 高强层组织与性能. (Chinese)

n 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 electric 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 HV 0.5 726.5, which is a significant improvement 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 reduction of its impact absorption power is due to the different properties between the layers. [ABSTRACT FROM AUTHOR]

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HV 0.5 726.5，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 FROM AUTHOR]

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