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Effect of contact pressure on IHTC and the formability of hot-formed 22MnB5 automotive parts.pdf
Applied Thermal Engineering 99 (2016) 419–428
Contents lists available at ScienceDirect
Applied Thermal Engineering
journal homepage: /locate/apthermeng
Research Paper
Effect of contact pressure on IHTC and the formability of hot-formed 22MnB5 automotive parts
Ying Chang a, Shujuan Li a, Xiaodong Li a,*, Cunyu Wang b,**, Ping Hu a, Kunmin Zhao a
a School of Automotive Engineering, State Key Lab of Structural Analysis for Industrial Equipment, Dalian University of Technology, Linggong Road, Dalian 116024, China b East China Branch of Central Iron Steel Research Institute(CISRI), Beijing 100081, China
HIGHLIGHTS
? Crack characteristics of hot-formed automotive parts are revealed. ? Relation of contact pressure-temperature-phase transformation-crack is analyzed. ? Interfacial heat transfer rules following contact pressure are investigated. ? IHTC is solved by experiments and numerical method during hot forming. ? Effective local oil-coating method is applied to improve the formability.
ARTICLE INFO
Article history: Received 2 July 2015 Accepted 15 January 2016 Available online 22 January 2016
Keywords: 22MnB5 boron steel Hot forming Interfacial heat transfer coe?cient (IHTC) Contact pressure Formability
ABSTRACT
The interfacial heat transfer coe?cient (IHTC) between the steel blank and die directly affects temperature distribution during hot forming of advanced high-strength steel automobile parts and further affects martensite microstructure distribution and formability. In this paper, an experimental platform is established and Beck’s nonlinear inverse estimation method is employed to solve the IHTC and investigate the rules of IHTC following contact pressure. This paper demonstrates that the IHTC increases with the increase in contact pressure. An actual hot-formed automotive B-pillar was obtained in the experiment. Results show that a high contact pressure corresponds to a high IHTC, which promotes fast blank cooling on the ?llet corner area. By contrast, a low co
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