Friction Characteristics of Iron-based Coated Dies with High-strength Steel under Hot Stamping Conditions

DENG Yulian; ZHOU Xiaoguang; CHANG Binghui; WANG Huajun; PAN Pingfeng; FANG Haojie; YAO Zhenhua

doi:10.3969/j.issn.1674-6457.2026.10.014

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (10) : 140-146. DOI: 10.3969/j.issn.1674-6457.2026.10.014

Iron and Steel Forming

Friction Characteristics of Iron-based Coated Dies with High-strength Steel under Hot Stamping Conditions

DENG Yulian^1,2, ZHOU Xiaoguang³, CHANG Binghui^1,2, WANG Huajun^1,2,*, PAN Pingfeng^1,2, FANG Haojie^1,2, YAO Zhenhua^1,2

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Abstract

The work aims to clarify the strengthening and anti-wear mechanisms of the Fe65 coating on hot-stamping dies and to improve the high-temperature tribological performance and service life of the dies. The Fe65 coating was fabricated on H13 steel substrate via plasma powder surfacing. The microstructure and hardness of the coating were characterized, and high-temperature friction-wear tests were conducted to compare the tribological behaviors and wear mechanisms of the H13 substrate, the Fe65 coating and the high-strength steel. The as-prepared Fe65 coating formed a sound metallurgical bond with the H13 substrate, with uniform and dense microstructure. Carbon-boron hard phases in the coating exerted a remarkable strengthening effect, and the coating hardness was 2.6 times that of the substrate. The friction coefficient of the H13 substrate fluctuated drastically, with an average value above 0.4 at various temperatures, while the Fe65 coating presented a stable friction coefficient of merely 0.389 at 500 ℃. Under identical test conditions, the wear loss of the H13 substrate was far higher than that of the Fe65 coating. The worn surface of the H13 substrate against high-strength steel was dominated by oxidative, adhesive, abrasive and fatigue wear. In contrast, the worn surface of the Fe65 coating against high-strength steel was characterized by oxidative wear and slight abrasive wear only, as the coating effectively suppressed micro-cutting and oxide agglomeration. In conclusion, surfacing the Fe65 coating on H13 hot-stamping dies can significantly improve surface hardness and stabilize friction coefficient and reduce wear loss, which is an effective surface modification method to enhance the die performance and service life.

Key words

high-strength steel / hot stamping / plasma powder surfacing cladding layer / high-temperature friction and wear / material transfer / surface strengthening

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DENG Yulian, ZHOU Xiaoguang, CHANG Binghui, WANG Huajun, PAN Pingfeng, FANG Haojie, YAO Zhenhua. Friction Characteristics of Iron-based Coated Dies with High-strength Steel under Hot Stamping Conditions[J]. Journal of Netshape Forming Engineering. 2026, 18(10): 140-146 https://doi.org/10.3969/j.issn.1674-6457.2026.10.014

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