Effect of Aging Temperature on Microstructure and Properties of Ultra-high Manganese Steel

Author of the article:ZHAO Yuelin1 , CHEN Sida2 , GAO Bingchen1 , LI Zulai2 , FENG Haibin1 , SHAN Quan2

Author's Workplace：1. Yunnan Kungang Wear Resistant Material Technology Co., Ltd., Kunming 653400, China; 2. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Key Words：aging temperature; ultra-high manganese steel; alloying; carbide; wear resistance

Abstract：Five kinds of heat treatment processes with different aging temperatures were developed to study the effect of aging temperature on the microstructure and properties of alloyed ultra-high manganese steel. The results show that with the increasing of aging temperature at 400~600 ℃, the amount of carbide increases and the austenite grain gradually increases. At 400~450 ℃, with the increasing of aging temperature, the carbides gradually increase, most of which are located in the grain interior and a small amount at the austenite grain boundary. When aging at 500~600 ℃, carbides gradually precipitate at grain boundaries at 500 ℃, and a large amount of carbides exist at grain boundaries and a small amount in grains at 600 ℃. Therefore, the hardness increases gradually, the impact toughness increases first and then decreases, the yield strength, tensile strength and elongation after fracture all increase first and then decrease, and the mechanical properties are the best when the aging temperature is 450 ℃.