Shanghai Jiao Tong University Details Findings in Metallurgy (Obtaining Ultrastrong and Ductile Steel With Hierarchical Lamellar Duplex Phase Microstructure By Two-stage Martensitic Transformation Mechanism)

摘要

2022 APR 13 (NewsRx) - By a News Reporter-Staff News Editor at Mining & Minerals Daily Daily - Investigators publish new report on Metals Research - Metallurgy. According to news reporting originating in Shanghai, People's Republic of China, by NewsRx journalists, research stated, “In the present work, ultrahigh strength (yield strength approximately 2.1 gigapascals) and superior ductility (uniform elongation of 17 pct) were achieved by optimizing the partitioning-deformation-tempering (PDT) process of an initial duplex phase steel of austenite and martensite, by which transformation-induced plasticity (TRIP)-assisted hierarchically heterogeneous microstructure can be obtained. Remarkably, after the Luders band deformation (the first deformation stage, Luders band strain similar to 8 pct) at an ultrahigh stress level, a second deformation stage (elongation >8 pct) occurred.”