由于纳米孪晶和冷轧奥氏体不锈钢中的双峰结构，拉伸延展性和强度实现了优异结合。

Excellent Combination of Tensile ductility and strength due to nanotwinning and a biamodal structure in cryorolled austenitic stainless steel.

作者信息

Kumar G Venkata Sarath, Mangipudi K R, Sastry G V S, Singh Lalit Kumar, Dhanasekaran S, Sivaprasad K

机构信息

Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, 620015, Tamil Nadu, India.

Technical Center, Ashokleyland, Chennai, 600103, Tamil Nadu, India.

出版信息

Sci Rep. 2020 Jan 15;10(1):354. doi: 10.1038/s41598-019-57208-x.

DOI:10.1038/s41598-019-57208-x

PMID:31941948

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6962382/

Abstract

Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility. However, the relatively low yield strength limits its application in high strength structural applications. Cryorolling is one of the promising methods of enhancing the mechanical properties of sheet metals. In the present work, Cryorolling of UNS S31000 stainless steel resulted in five-fold enhancement in yield strength with a significant loss in ductility. However, flash annealing at 800 °C for 120 s could restore its ductility up to 50% of its original ductility. The enhancement in strength is attributed to the formation of deformation nano-twins during flash annealing along with a bimodal grain structure.

摘要

奥氏体不锈钢因其优异的耐腐蚀性以及强度和延展性的结合而成为突出的材料。然而，相对较低的屈服强度限制了其在高强度结构应用中的应用。低温轧制是提高金属板材力学性能的一种有前景的方法。在目前的工作中，对UNS S31000不锈钢进行低温轧制使屈服强度提高了五倍，但延展性有显著损失。然而，在800 °C下进行120 秒的快速退火可以将其延展性恢复到原始延展性的50%。强度的提高归因于快速退火过程中变形纳米孪晶的形成以及双峰晶粒结构。