Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion
Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion
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DOI：
10.1016/j.matlet.2021.130364
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发表时间：
2021-07-06
影响因子：
3
通讯作者：
Kawasaki, Megumi
中科院分区：
文献类型：
--
作者：
Han, Jae-Kyung;Liu, Xiaojing;Kawasaki, Megumi
本研究调查了在室温下通过高压扭转（HPT）进行打印后纳米结构化过程中增材制造的316L不锈钢的结构演变，包括晶粒尺寸、微观应变和晶格参数。在8次HPT转动后，在平均晶粒尺寸为60 nm的纳米结构奥氏体钢中观察到马氏体相的形成。在纳米晶结构中，密排面和密排面外存在显著的应变梯度，而在竣工材料中没有观察到这种应变梯度。结构变化发生在纳米结构化的非常早期的阶段，通过1/ 2 HPT转向，并归因于严重的晶格畸变的过量的位错和缺陷。
This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the closepacked planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/ 2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects.