Effect of micro ploughing during fine particle peening process on the microstructure of metallic materials
Effect of micro ploughing during fine particle peening process on the microstructure of metallic materials
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DOI：
10.1016/j.jmatprotec.2009.08.010
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发表时间：
2009-11-19
影响因子：
6.3
通讯作者：
Komotori, Jun
中科院分区：
文献类型：
--
作者：
Kameyama, Yutaka;Komotori, Jun
在这项研究中，细颗粒喷丸（FPP）处理引起的微观组织变化的机制进行了分析。用工具钢颗粒进行FPP处理的Ti-6Al-4V合金试样，喷丸时间为0.1 ~ 30 s。通过对短时FPP处理后试样的观察发现，碰撞颗粒与试样表面之间的微磨粒行为形成了两种类型的碰撞凹痕。一种是“锯齿状凹痕”，由颗粒垂直碰撞表面形成，另一种是“犁削凹痕”，伴随着一堆堆积的材料，这些材料在形成凹痕的过程中被犁削到一边。使用能量色散X射线光谱（EDS）的分析表明，存在的颗粒碎片转移到犁的凹痕，虽然没有碎片上观察到的凹痕。随着喷丸时间的增加，由于微犁削效应，转移的碎片被变形的材料嵌入处理过的材料中。富铁区随着颗粒碎片的嵌入而变深。最后，通过FPP处理形成具有高浓度Fe的片层组织。阐明了FPP过程中微犁削对层状改性组织形成的影响。一个效果是金属从颗粒转移到衬底的增强，因为原始金属表面被暴露;另一个是转移元素到衬底中的机械混合。(C)2009爱思唯尔有限公司版权所有。
In this study, the mechanism of microstructural changes induced by fine particle peening (FPP) treatment was analyzed. Ti-6Al-4V alloy specimens treated with FPP, using tool steel particles with a peening time ranging from 0.1 to 30 s were prepared and examined. Observation of the specimen with short-term FPP treatment revealed that two types of collision dents were formed by the micro abrasive behavior between collided particles and specimen surface. One was the "indented dent," formed by particles that collided with the surface vertically, and the other was the "ploughed dent," accompanied by a heap of piled-up material that was ploughed aside during the formation of this dent. Analyses using energy dispersive X-ray spectroscopy (EDS) revealed the presence of particle fragments transferred to the ploughed dents, although no fragments were observed on the indented dents. With an increase in peening time, transferred fragments were embedded into treated materials by deformed material due to a micro ploughing effect. The Fe-rich region became deeper as the particle fragments were embedded. Finally, a lamellar microstructure with a high concentration of Fe was formed by FPP treatment. The effects of micro ploughing during the FPP process on the lamellar modified microstructure formation were clarified. One effect was an enhancement of metal transfer from particles to substrate because virgin metallic surface was exposed: and the other was the mechanical mixing of transferred elements into the substrate. (C) 2009 Elsevier B.V. All rights reserved.