Research on a New Localized Induction Heating Process for Hot Stamping Steel Blanks

Materials

Qi Li¹  Jian Wu¹  Weijie Liu¹  Jingqi Chen¹  Yu Gu¹  Li Bao¹ 

[1] School of Material Science and Engineering, Northeastern University, Shenyang 110006, Liaoning, China;

关键词: localized inductive heating;    hot stamping steel blanks;    tailored properties;    magnetizer;   

DOI  :  10.3390/ma12071024

来源: DOAJ

【 摘 要 】

Localized induction heating with one magnetizer was experimentally analyzed in order to investigate the altering effect of the magnetizer on the magnetic field. A 22MnB5 blank for tailored property was locally heated to produce the parts of a car body in white, such as the B-pillars. A lower-temperature region with a temperature in the two-phase zone and a full-austenitic high-temperature region were formed on the steel blank after 30 s. After water-quenching, the mixture microstructure (F + M) and 100% fine-grained lath martensite were obtained from the lower- and high-temperature regions, respectively. Moreover, the ultimate tensile stress (UTS) of the parts from the lower- and high-temperature regions was 977 and 1698 MPa, respectively, whereas the total elongations were 17.5% and 14.5%, respectively. Compared with the parts obtained by conventional furnace heating–water quenching (UTS: 1554 MPa, total elongation: 12%), the as-quenched phase developed a tensile strength over 100 MPa greater and a higher ductility. Thus, the new heating process can be a good foundation in subsequent experiments to arbitrarily tailor the designable low-strength zone with a higher ductility by using magnetizers.

【 授权许可】

Unknown