304不锈钢微成形表层晶粒影响行为研究
发布时间：2018-11-12 06:36
【摘要】：在微塑性成形过程中,虽然零件的宏观尺寸达到了毫米或微米级,但其微观组织却没有发生明显的变化,材料的表层晶粒尺寸也就越来越趋近零件的几何尺寸,导致塑性成形规律呈现出与宏观大尺寸零件不同的尺寸效应现象。对四种厚度的304不锈钢薄板试样进行了单向拉伸试验和微弯曲试验,测量了薄板的厚度。结果表明,随着薄板厚度的减小,塑性变形区内表层晶粒的位错滑移变化对力学性能和无量纲弯矩的影响越来越显著,表现出"越薄越强"的尺寸效应现象。引入修正的Hall-Petch公式与修正的Nix-Gao应变梯度模型,使力学性能和无量纲弯矩的预测和试验结果吻合。
[Abstract]:In the process of micro-plastic forming, although the macroscopic size of the part reaches millimeter or micron, the microstructure of the material does not change obviously, and the grain size of the surface layer of the material becomes more and more close to the geometric size of the part. As a result, the plastic forming law shows different size effect from macroscopically large-sized parts. The specimens of 304 stainless steel sheet with four different thickness were tested by uniaxial tensile test and micro-bending test, and the thickness of the thin plate was measured. The results show that the effect of dislocation slip on mechanical properties and dimensionless bending moment is more and more obvious with the decrease of thin plate thickness. By introducing the modified Hall-Petch formula and the modified Nix-Gao strain gradient model, the prediction of mechanical properties and dimensionless bending moment is in agreement with the experimental results.
【作者单位】： 河北工程大学机电工程学院;
【分类号】：TG142.71
本文编号：2326318
[Abstract]:In the process of micro-plastic forming, although the macroscopic size of the part reaches millimeter or micron, the microstructure of the material does not change obviously, and the grain size of the surface layer of the material becomes more and more close to the geometric size of the part. As a result, the plastic forming law shows different size effect from macroscopically large-sized parts. The specimens of 304 stainless steel sheet with four different thickness were tested by uniaxial tensile test and micro-bending test, and the thickness of the thin plate was measured. The results show that the effect of dislocation slip on mechanical properties and dimensionless bending moment is more and more obvious with the decrease of thin plate thickness. By introducing the modified Hall-Petch formula and the modified Nix-Gao strain gradient model, the prediction of mechanical properties and dimensionless bending moment is in agreement with the experimental results.
【作者单位】： 河北工程大学机电工程学院;
【分类号】：TG142.71
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1 易耀勇;刘观辉;张宇鹏;刘美华;罗子艺;许磊;;奥氏体304不锈钢A-TIG焊活性剂研制[J];焊接技术;2014年04期
，本文编号：2326318
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