Experimental and Numerical Investigations on Microcoining of Stainless Steel 304
Experimental and Numerical Investigations on Microcoining of Stainless Steel 304
复制标题
DOI：
10.1115/1.2953235
复制
发表时间：
2008-08
影响因子：
4
通讯作者：
G. Kim;M. Koç;J. Ni
中科院分区：
文献类型：
--
作者：
G. Kim;M. Koç;J. Ni
对微型金属零件的需求不断增加，推动了微成形在各个行业的应用。然而，在高强度材料中形成微型特征方面，只有有限的研究。本研究探讨了304不锈钢微特征的形成，采用模压工艺。实验研究了工件厚度、预制体形状、晶粒尺寸和特征尺寸对形成320 μm至800 μm特征的影响。发现某些预成型件形状通过允许块体材料的有利流动来增强特征形成。此外，考虑到晶粒和特征尺寸的影响，开发了304型不锈钢的流动应力模型，以准确建模和更好地理解压印过程。弱化的材料，作为在微型尺度上的晶粒尺寸的增加，被解释的霍尔-佩奇关系和特征尺寸效应。
Increasing demands for miniature metallic parts have driven the application of micro-forming in various industries. Only a limited amount of research is, however, available on the forming of miniature features in high strength materials. This study investigated the forming of microfeatures in Type 304 stainless steel by using the coining process. Experimental work was performed to study the effects of workpiece thickness, preform shape, grain size, and feature size on the formation of features ranging from 320 μm to 800 μm. It was found that certain preform shapes enhance feature formation by allowing a favorable flow of the bulk material. In addition, a flow stress model for Type 304 stainless steel that took into consideration the effects of the grain and feature sizes was developed to accurately model and better understand the coining process. Weakening of the material, as the grain size increased at the miniature scale, was explained by the Hall-Petch relationship and the feature size effect.