Effect of ultrasonic surface shot peening on the microstructure and properties of Cu-8Cr alloy

IF 2 3区材料科学 Q2 ENGINEERING, MECHANICAL

Surface Topography: Metrology and Properties Pub Date : 2023-07-05 DOI:10.1088/2051-672X/ace467

Xiang Wang, Changxi Jiang, Tao Liu, Dan Qin, Baoquan Chen, Xuehui Zhang, Tongxiang Liang

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Abstract

Surface nanocrystalline layers were prepared on Cu-8Cr alloy using ultrasonic shot peening (USSP) technique by controlling the pellet size and shot peening time. The tissue morphology, microstructure, surface hardness, surface strength and corrosion resistance of the generated surface nanolayers were systematically characterized using x-ray diffractometer (XRD), scanning electron microscope (SEM), and the corresponding test methods. The results showed that the USSP treatment did not change the surface phase of Cu-8Cr alloy, but only refined the surface grains into nanocrystals. The pellet size and shot peening time had a large effect on the surface properties of Cu-8Cr alloy. The best overall surface properties were obtained with a shot size of 2 mm and a shot time of 30 min The average grain size of the nano-layer is about 66 nm, the surface hardness is increased to 126.69 HV0.05, the tensile strength reached 417 MPa, and the corrosion resistance of the alloy is significantly enhanced. The USSP treatment provides a new method for the preparation of CuCr alloys with excellent surface properties.

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超声表面喷丸强化对Cu-8Cr合金组织和性能的影响

通过控制球团尺寸和喷丸时间，采用超声喷丸技术在Cu-8Cr合金表面制备了纳米晶层。采用x射线衍射仪(XRD)、扫描电镜(SEM)及相应的测试方法对制备的表面纳米层的组织形态、微观结构、表面硬度、表面强度和耐蚀性进行了系统表征。结果表明:USSP处理没有改变Cu-8Cr合金的表面相，只是使表面晶粒细化为纳米晶;球团尺寸和喷丸时间对Cu-8Cr合金的表面性能影响较大。当喷丸尺寸为2 mm，喷丸时间为30 min时，获得了最佳的表面综合性能，纳米层的平均晶粒尺寸约为66 nm，表面硬度提高到126.69 HV0.05，抗拉强度达到417 MPa，合金的耐腐蚀性能显著增强。USSP处理为制备表面性能优良的CuCr合金提供了一种新的方法。

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来源期刊

Surface Topography: Metrology and Properties Materials Science-Materials Chemistry

CiteScore

4.10

自引率

22.20%

发文量

183

期刊介绍： An international forum for academics, industrialists and engineers to publish the latest research in surface topography measurement and characterisation, instrumentation development and the properties of surfaces.