4.7 Article

Rate controlling deformation mechanisms in SS316L stainless steel manufactured using laser powder bed fusion technique

期刊

INTERNATIONAL JOURNAL OF PLASTICITY
卷 171, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2023.103787

关键词

Additive manufacturing; Stainless steel; Solute segregation; Strain rate sensitivity; Activation volume

向作者/读者索取更多资源

This study investigates the strain rate controlling mechanisms in additively manufactured SS316L stainless steel through experiments and simulations. The findings highlight the role of high dislocation density and chemical segregation, and demonstrate the importance of solute segregation in increasing the activation volume. The results also suggest that dislocation forest does not play a significant role in controlling the strain rate. Furthermore, the study reveals the impact of the dynamic pileup dislocation density readjustment mechanism on the strain rate sensitivity.
We conducted uniaxial tensile strain rate jump tests to account for the strain rate controlling mechanisms in the additively manufactured SS316L stainless steel. Special emphasis is placed on the role of high dislocation density and chemical segregation on dictating the rate sensitive behavior. Lowest strain rate sensitivity is found, despite the highest dislocation density in the as build state, which signified the role of solute segregation at cell walls in increasing the activation volume and forms the strong basis for rejecting dislocation forest as the strain rate controlling obstacles. Consistent increase in the strain rate sensitivity with annealing is found consistent with the chemical homogenisation of the solutes causing smaller inter-obstacle spacing causing decreasing activation volume. Experimental findings are supported by CALPHAD simulations and mechanical threshold stress (MTS) modelling framework. Significant difference between the instantaneous and steady state rate sensitivity is understood using the dynamic pileup dislocation density readjustment mechanism causing considerable flow transient while adjusting the mobile dislocation density on strain rate change in the presence of solute decorated dislocation cells. Present investigation helps in gaining newer insights into the deformation mechanisms of the additively manufactured alloys featuring cellular microstructures.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据