Fabrication of 10 nm grained bulky material and the properties

点击翻译按钮获取中文摘要

SUS304 and SUS316 stainless steels having low stacking fault energy were multi-directionally forged (MDF) at ambient temperature and 77 K, where lower MDF temperature would accelerate occurrence of mechanical twinning to cause grain refinement down to 20 nm. As the increase in cumulative strain of MDF, grain refinement proceeded by intersection of twins. This tendency was more obvious at lower temperature. Occurrence of martensitic transformation, however, hindered the grain refinement. The grain refinement and strength in the SUS304 stainless steel, therefore, were not so notable due to martensitic transformation compared with in the SUS316 one. The MDFed stainless steels possessed superior balance of strength and ductility, i.e., 1.8 GPa and 20 %.