自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 4    April 2018

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Influences of hot stamping parameters on mechanical properties and microstructure of 30MnB5 and 22MnB5 quenched in flat die
MU Yan-hong(慕延宏), WANG Bao-yu(王宝雨), ZHOU Jing(周靖), HUANG Xu(黄旭), LI Jun-ling(李俊玲)

School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract:The influences of hot stamping parameters such as heating temperature, soaking time, deformation temperature and cooling medium on the phase transformation, microstructure and mechanical properties of 30MnB5 and 22MnB5 are investigated and analyzed in this work. The quenching experiment, tensile testing, hardness measurement and microstructure observation were conducted to obtain the mechanical and microstructural data. The results indicate that 30MnB5 possesses a higher tensile strength but a lower elongation than 22MnB5, if hot stamped at the same process parameter. The tensile strength and hardness of the hot stamped specimens decrease under inappropriate heating conditions for two reasons, insufficient austenitization or coarse austenite grains. The austenitic forming rate of 30MnB5 is higher than that of 22MnB5, because more cementite leads to higher nucleation rate and diffusion coefficient of carbon atom. More amount of fine martensite forms under the higher deformation temperature or the quicker cooling rate.

 

Key words: high strength boron steel; mechanical properties; microstructure; hot stamping parameter

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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