25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Influence of microstructure on wear resistance of cold working tool steels with different chemical compositions Under different wear conditions

26 Apr 2022, 09:30
20m
Room 2

Room 2

Oral Presentation Cold & hot working tool steels Cold & Hot Working Steels

Speaker

Hongqing Wu (Shanghai University)

Description

From the viewpoints of the microstructure and phase, the friction and wear properties under different friction pair conditions, different wear loads and lubrication methods, the SLD-MAGIC, SKD11 and DC53 cold-working die steels were systematically estimated, which provided theoretical support for reasonable material selection of cold-working dies. The results show that all three steels contain M7C3 eutectic ledeburite carbide, M7C3, M23C6 and MC secondary carbide in the tempered microstructure, and the carbide content ratio is 13.6wt.%, 11.2 wt.% and 10.5wt.%, respectively. Among the three steels, the proportion of carbides with size of 0-0.05 µm in SKD11 steel is 26.8%, and DC53 accounts for 41.2%,Sld-magic accounted for 43.3%; For carbides larger than 1m, SKD11 steel accounts for 7.23%, DC53 accounts for 1.54%, and SLD-MAGIC accounts for 2.94%. At the same time, the SLD-MAGIC steel also has a banded (Mn ,Fe, Mo)xSy sulfide phase with a volume fraction of 4.5%. In the dry friction experiments, the wear mechanisms of the steel are abrasive and adhesive wear. SLD-MAGIC steel has the best wear performance at 10N and 70N load, while SKD11 has the best wear performance at 40N, followed by SLD-MAGIC. In the oil-lubricated environment, when the load is 70N and the wear time is 2h, the friction coefficient of SLD-MAGIC steel is basically maintained at 0.1, and the wear resistance of SLD-MAGIC is remarkable, with the wear volume only being 12.6% of SKD11 steel and 20.5% of DC53 steel.
Fig.1 (a,b,c) Canning morphologies of annealed steels: (a)SKD11;(b)DC53;(c) SLD-MAGIC(d) Typical sulfide energy spectra in annealed steels;(e,f) 70 N loaded SKD11, DC53 and SLD-MAGIC during oil lubrication: (e) Friction coefficient ; (f) The wear volume

Speaker Country China

Primary author

Hongqing Wu (Shanghai University)

Co-authors

Hui Ning (Shanghai University) Xiaochun Wu (Shanghai University) Zhipeng Deng (Shanghai University)

Presentation Materials

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