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Experimental and Numerical Analyses of Hot Stamped Parts with Tailored Properties

Title
Experimental and Numerical Analyses of Hot Stamped Parts with Tailored Properties
Authors
Choi, JWBok, HHBarlat, FSon, HSKim, DJLee, MG
POSTECH Authors
Barlat, F
Date Issued
Jun-2013
Publisher
Japan Inst Iron Steel
Abstract
Tailored properties in hot press forming process (HPF) were investigated with focus on phase transformation characteristics and deformation behavior of constituent base materials for the Tailor Welded Blank (TWB-HPF) and partial quenching (PQ-HPF) approaches. The former uses sheets with different hardenabilities, which results in graded mechanical properties after HPF. The latter uses a single sheet but different heat treatment conditions, which eventually induce the same effect as the first approach. Preliminary dilatometric experiment was conducted to investigate the phase transformation characteristics of the two base metals for TWB-HPF. U-channel was formed by draw bending with the two approaches. For PQ-HPF, several initial tool temperatures varying from room to 450 degrees C were investigated. Thermo-mechanical finite element (FE) analyses of the HPF process with metallurgical considerations in the constitutive model were performed for parts exhibiting tailored properties. These analyzes included the evaluation of heat transfer characteristics and the microstructure evolutions under HPF conditions. A thermodynamic calculation program was used to determine the thermo-physical, physical and metallurgical properties for various microstructures and temperatures. FE analyzes of the hot press forming with phase transformation considerations were conducted using the commercial software DEFORM (TM)-3D with the DEFORM (TM)-HT module. The combined experimental and simulation results provided an understanding, on the one hand, of the role of phase transformation in strengthening the material and reducing springback for the TWB-HPF approach and, on the other hand, of temperature on phase transformation characteristics of HPF steel for the PQ-HPF approach.
Keywords
tailored properties; Hot Press Forming (HPF); Tailor Welded Blank (TWB); Partial Quenching (PQ); phase transformation; TRANSFORMATION PLASTICITY; MECHANICAL-PROPERTIES; QUENCHING PROCESS; PHASE-CHANGE; STEELS; MICROSTRUCTURE; PREDICTION; KINETICS
URI
http://oasis.postech.ac.kr/handle/2014.oak/14692
DOI
10.2355/ISIJINTERNATIONAL.53.1047
ISSN
0915-1559
Article Type
Article
Citation
ISIJ INTERNATIONAL, vol. 53, no. 6, page. 1047 - 1056, 2013-06
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 BARLAT, FREDERIC GERARD
Graduate Institute of Ferrous Technology
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