MICROSTRUCTURE OF LASER TREATED LAYER ON HIGH SPEED TOOL STEEL

Acta Metall Sin

1991, Vol. 27

Issue (4): 17-20 DOI:

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MICROSTRUCTURE OF LASER TREATED LAYER ON HIGH SPEED TOOL STEEL

LI Chenglao;SHEN Lian;LIU Junhai Xi'an Jiaotong University

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LI Chenglao;SHEN Lian;LIU Junhai Xi'an Jiaotong University. MICROSTRUCTURE OF LASER TREATED LAYER ON HIGH SPEED TOOL STEEL. Acta Metall Sin, 1991, 27(4): 17-20.

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Abstract The microstructure of the laser melted and resolidified layer on highspeed tool steel W_(18)Cr_4V observed is of very fine dendrites. The δ-ferrite remainsin the centre of part of the dendrites. The interior of dendrite is the twinned mar-tensite and a few dislocation martensite. M_(23)C_6 carbide along twin plane on twinnedmartensite may coherently precipitate as thin plate. The austenite enriched with al-loying elements as W, V and Cr, and M_6C carbide are found among the dendritearms.

Key words: high speed tool steel laser treatment microstructure

Received: 18 April 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I4/17

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