表面喷丸工艺对Super304H奥氏体耐热钢组织与性能的影响

来源期刊：中南大学学报(自然科学版)2017年第4期

论文作者：高岩 王锐坤 郑志军

文章页码：903 - 910

关键词：Super304H；表面喷丸处理；剧烈塑性变形层；硬度

Key words：Super304H; surface shot peening; severe plastic deformation layer; hardness

摘    要：采用表面喷丸处理在Super304H钢表面制备出大塑性变形层，利用扫描电子显微镜(SEM)、金相显微镜、X线衍射仪(XRD)和显微硬度计对喷丸表面及塑性变形层不同深度的组织和硬度进行表征，并对试样在喷丸过程中的组织结构变化进行研究。研究结果表明：Super304H钢经喷丸处理后，表层通过塑性变形产生高密度的位错、层错并细化晶粒，同时获得形变诱发马氏体，从而形成了一定厚度的剧烈塑性变形层。随着喷丸时间增加，晶粒越细小，马氏体相越多；喷丸处理后表层硬度显著提高，是原始试样硬度的2倍以上。

Abstract: Severe plastic deformation layer was synthesized on the surface of Super304H stainless steel by surface shot peening. The microstructures and properties of plastic deformation layer were characterized by using scanning electron microscopy (SEM), metallurgical microscope, X-ray diffraction (XRD) and microhardness tester. The grain refining behavior and microhardness distribution were analyzed and discussed. The results show that the grain of surface layer of Super304H stainless steel is refined with high density of dislocations or stacking faults by plastic deformation after shot peening and at the same time, strain induced martensite phase transition is produced. With the increasing of shot peening time, the grain size decreases and the volume fractions of strain induced martensite increases. Surface hardness is improved significantly and is more than twice the untreated specimen.