Microstructure evolution of an ultra-high strength metal alloy with tempering temperature

• Published in: Rare metals Vol. 31; no. 5; pp. 442 - 445
• Main Authors: Wu, Sujun, Hu, Bin, Han, Bo
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg Nonferrous Metals Society of China 01-10-2012; Springer Nature B.V; School of Materials Science and Engineering, Beijing University of Aeronautcs and Astronautics Beijing 100191, China
• Subjects: Austenite; Biomaterials; Carbon steels; Chemistry and Materials Science; Decomposition; Energy; Martensite; Materials Engineering; Materials Science; Metallic Materials; Microstructure; Nanoscale Science and Technology; Optical microscopy; Physical Chemistry; Tempering; Transmission electron microscopy; tempering temperature; extra-high carbon steels; microstructure
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-012-0536-1

Optical microscopy (OM) and transmission electron microscopy (TEM) were used to investigate the effect of tempering temperature on the experimental extra-high carbon steels.It is found that tempering reaction can reduce austenite content and influence the stability of the austenite.As-normalized microstructure is a mixture of twinned martensite and retained austenite.Tempered at 250 ℃ for 2 h,lath martensite can occasionally be found nearby the diffusionally decomposed austenite arca.It also is found that tempering at 650 ℃ for 2 h,nanoparticles of carbides precipitate in the martensite and decomposed austenite.