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首页> 外文会议>Powder metallurgy world congress amp; exhibition >Shot-Peening, at Different Intensity, of High-Property PM Steels: Stress State, Microhardness and Roughness Changes at Different Density
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Shot-Peening, at Different Intensity, of High-Property PM Steels: Stress State, Microhardness and Roughness Changes at Different Density

机译：高性能粉末冶金钢在不同强度下的喷丸硬化：不同密度下的应力状态，显微硬度和粗糙度变化

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摘要

Shot-peening is a secondary operation frequently utilized to improve strength properties of thin layers of metallic materials. When applied to PM steels, its positive effect, in principle deriving from high-compressive local stresses, is amplified by measurable increases of local density. On this basis, two hybrid powders, having the same chemical composition and suitable to obtain high-property sintered or sinterhardened steels, have been used to get samples to be shot-peened after sinterhardening, at different intensity levels. Physical, microstructural and mechanical properties (4 point bending strength, hardness, bulk microhardness, microhardness pattern from the surface, local density, surface roughness, SEM surface texture) have been detected on samples manufactured in industrial conditions, at two density levels. The comparison between not-shot-peened and shot-peened probes enables to detect the different pattern of response, and changes of surface texture originated by a same "surface-hardening process" applied to two nominally equivalent materials. In principle, raw materials produced by a given process and having equal chemical composition are supposed to be equivalent. The results of this research work show some modest differences, if any, between the high-property tested PM steels. The analysis and the comparison of the various achieved data enable to outline the most suitable processing conditions to exploit the potential of shoot-peening applied to high-property PM steels.
机译：喷丸硬化是经常用于改善金属材料薄层强度特性的辅助操作。当应用于PM钢时，其可观的局部密度的增加会放大其积极作用，原则上源自高压缩局部应力。在此基础上，已使用两种具有相同化学成分且适用于获得高品质烧结或烧结硬化钢的混合粉末，以在不同强度水平下获得在烧结硬化后进行喷丸处理的样品。在工业条件下以两个密度水平检测了样品的物理，微观结构和机械性能（4点弯曲强度，硬度，整体显微硬度，表面显微硬度图，局部密度，表面粗糙度，SEM表面纹理）。未喷丸探针与喷丸探针之间的比较能够检测到不同的响应模式，并且通过对两种名义上等效的材料应用相同的“表面硬化过程”而引起的表面纹理变化。原则上，假定通过给定方法生产且化学成分相等的原材料是等效的。这项研究工作的结果表明，在经过高性能测试的PM钢之间，存在一些适度的差异（如果有的话）。通过对各种获得的数据进行分析和比较，可以概述最合适的加工条件，以开发应用于高性能PM钢的喷丸处理潜力。

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