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22 December 2023 Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching
Weiquan Kuang, Yu Zheng, Jie Chen, Wenwen Liu, Wenhai Peng, Zongyi Ye, Yu Cao
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Proceedings Volume 12982, Pacific-Rim Laser Damage 2023: Optical Materials for High-Power Lasers; 129820V (2023) https://doi.org/10.1117/12.3014244
Event: SPIE/SIOM Pacific Rim Laser Damage, 2023, Shanghai, China
Abstract
Laser continuous/dispersed quenching techniques were used for surface hardening Cr8 cold work die steel, and its metallographic microstructures and mechanical properties are investigated in this work. Typical mixed structure which composed of carbides in different morphologies and acicular martensite can be obtained by laser quenching. The excellent wear resistance and surface hardness of Cr8 die steel are attributed to the synergistic effect of solid solution strengthening, grain refinement and high dislocation density. Meanwhile, the phase change hardening layer structure and residual tensile stress induced by full area coverage scanning (LCQ) are the main factors to deteriorate the impact toughness and bending performance after laser quenching. The soft substrate-hardened unit structure with laterally spaced distribution (LDQ) obtained by graphical scanning reduces the heat accumulation effect on the surface, which reduces concentration of deformation near the hardened layer. The bending property and fracture mechanism are studied. Compared with the forging die material treated by LCQ, the impact energy and bending resistances of forging die materials treated by LDQ are enhanced significantly. Consequently, Cr8 die steel takes into account the same wear resistance, and scanning strategy should be controlled to retain more interval distribution hardening units in layer structure for superior impact toughness and bending properties.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Weiquan Kuang, Yu Zheng, Jie Chen, Wenwen Liu, Wenhai Peng, Zongyi Ye, and Yu Cao "Control of the metallographic and mechanical properties of Cr8 cold-work die steel by laser continuous/dispersed quenching", Proc. SPIE 12982, Pacific-Rim Laser Damage 2023: Optical Materials for High-Power Lasers, 129820V (22 December 2023); https://doi.org/10.1117/12.3014244
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KEYWORDS
Quenching
Deformation
Laser microstructuring
Materials properties
Heat treatments
Laser processing
Surface properties
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