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Technical Brief

A Study of a Tailored Tempering Process for the CSC-15B22 Steel Sheet

[+] Author and Article Information
Li-Wei Chen

Department of Mechanical and Computer-Aided Engineering, National Formosa University, Huwei, Yunlin, 632, Taiwan
revere@ms54.hinet.net

Yung-Hung Chen

Department of Mechanical and Computer-Aided Engineering, National Formosa University, Huwei, Yunlin, 632, Taiwan
adidas310320@gmail.com

Yuan-Chuan Hsu

Department of Mechanical and Computer-Aided Engineering, National Formosa University, Huwei, Yunlin, 632, Taiwan
jasonych@nfu.edu.tw

1Corresponding author.

ASME doi:10.1115/1.4038370 History: Received December 28, 2016; Revised November 01, 2017

Abstract

A simulation and experimental method are used to determine the parameters of a tailored tempering process for a lab-scale B-pillar that is made from CSC-15B22 high-strength steel. The finite element software, DEFORM-3D, is used to simulate the tailored tempering process. A segmented hot stamping tool is developed for testing. Results demonstrate that the cooling and heating system are successful. On the cooled side of the tooling, the cooling rate for the sheet is more than 30?/s. The material structure of the sheets is entirely a Martensite structure, which results in an ultra-high strength material. The average hardness is measured as HV423, which translates to a tensile strength of 1350MPa. On the heated side of the tooling, the cooling rate for the sheet is less than the critical cooling rate, the microstructure of the material is ferrite and pearlite and the average hardness is measured at HV205, which translates to a tensile strength of approximately 660MPa. The study proves that a tailored tempering process allows production using integrated tooling and produces sheets that have different mechanical properties.

Copyright (c) 2017 by ASME
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