Effect of Tempering Temperature after Quenching on Microstructure and Properties of 20SiMn2Mo Steel
Author of the article:LI Qing;CHENG Juqiang
Author's Workplace：College of Materials Science and chemical Engineering,Xi'an Technological University,Xi'an 710021,China
Key Words：bainite steel quenching tempering microstructure
Abstract：
The influence of tempering temperature on microstructure and properties of 20 SiMn2 Mo steel after quenching at920℃was studied.The results show that the strength and hardness of the experimental materials decrease with the increase of tempering temperature.The impact toughness at 200℃is the highest,which is the best tempering temperature.The mechanical properties of Rm,A,Z and AKVare 1,550 MPa,14%,58%and 73 J,respectively,the microstructure of which is tempered martensite and retained austenite.The impact toughness of tempering at 400℃and 550℃is lower.Temper brittleness appeared and the fracture is characterized by intergranular brittle fracture.
