两种热冲压模具用钢的抗拉毛性能

doi:10.11896/cldb.20040155

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Abstract Hot stamping is a metal-forming process for stamping and forming high-strength steel plates, which can not only greatly improve the forming performance of the material, but also refine the grain size through high-temperature phase transformation. However, during the hot stamping process, the high-strength steel sheet has been heated above the austenitizing temperature. At this time, the yield strength of the high-strength steel sheet is low, and the high-strength steel sheet can easily be scratched by the debris knob. The mechanical properties of high strength steel plates were reduced significantly. In this respect, many auto parts manufacturers have relieved the hot-stamping galling problem of parts by surface treatment, but this treatment will increase production costs. For this reason, this study starts from the alloying ratio of the mould materials, and through experimental and theoretical research, it is preliminarily judged that the anti-galling performance of hot stamping moulds is related to the ability of plastic deformation resistance of the mould materials. In order to verify the conjecture, the transmission electron microscope (TEM), X-ray diffractometer, residual stress meter, micro Vickers hardness tester were used to observe the carbide types, carbide distribution, dislocation density in the two tempered materials (SDCM steel and SDHS2 steel), and residual stress gradient and micro Vickers hardness gra-dient of the section after shot peening. The results show that compared with SDHS2 steel, the yield strength of SDCM steel with better anti-galling performance is higher, which makes it have stronger resistance to plastic deformation under the same applied stress, making its deformation softening layer shallower. In addition, vanadium-based carbides are predominant in both SDCM steel and SDHS2 steel after heat treatment. Among them, SDCM steel with higher carbon content, higher vanadium content and lower chromium content contains higher carbide volume fraction and dislocation density, which results in higher precipitation strengthening and dislocation strengthening effect, increasing the yield strength of the material. Therefore, under the same applied stress, SDCM steel has excellent plastic deformation resistance.

Key words： hot stamping mould steel galling plastic deformation resistance dislocation density carbide

Published: 04 June 2021

CLC number:	TG76
	TG704

Fund:National Key Research and Development Program of China (2016YFB0300400, 2016YFB300402).

About author:: Qiang Sun received his master's degree in material processing engineering from the Shanghai University in Sep. 2017—Jun. 2020. He has published 1 journal papers as the first author. His research interests focus on development of advanced hot stamping mould materials and their anti-galling properties.
Xiaochun Wu is a professor and doctoral supervisor of Shanghai University. In recent years, more than 110 die-related scientific research projects have been completed (scientific research funds reached more than 83 million yuan). He has published more than 350 journal papers, and 20 national invention patents were autho-rized. He has won three second-class prizes for provincial and ministerial level scientific and technological progress. He is the chief expert of the “Eleventh Five-Year” National Science and Technology Support Program “Key Technology Development of High Quality Die Steel Forging Materials” and “High Performance Tool Steel and Application” project of “13th Five-Year” National Key R&D Project.

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	SUN Qiang
	HUANG Suqi
	CAI Zhuwen
	DANG Weidong
	WU Xiaochun2

Cite this article:

SUN Qiang,HUANG Suqi,CAI Zhuwen, et al. Anti-galling Performance of Two Hot Stamping Mould Steels[J]. Materials Reports, 2021, 35(10): 10152-10157.

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http://www.mater-rep.com/EN/10.11896/cldb.20040155 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10152

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