EFFECT OF LASER MELTING PROCESSING ON MICROSTRUCTURE OF GRAY CAST IRON

Acta Metall Sin

1989, Vol. 25

Issue (1): 75-77 DOI:

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EFFECT OF LASER MELTING PROCESSING ON MICROSTRUCTURE OF GRAY CAST IRON

SHEN Lian;LI Chenglao;WANG Xiuling;MA Lihua;ZHU Daozhen Xi'an Jiaotong University

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SHEN Lian;LI Chenglao;WANG Xiuling;MA Lihua;ZHU Daozhen Xi'an Jiaotong University. EFFECT OF LASER MELTING PROCESSING ON MICROSTRUCTURE OF GRAY CAST IRON. Acta Metall Sin, 1989, 25(1): 75-77.

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Abstract The microstructures of the laser hardened layer on the gray cast iron HT20--40 af-ter laser melting processing were examined by optical microscopy, transmission electron microscopy(TEM) and scanning electron microscopy (SEM). Experimental results showed that a structurewith dendritic (M+A') and interdendriticly iaminal transformed ledeburite (M+A'+Fe_3C) wasproduced after laser melting processing. The martensite was a mixture of dislocation martensite andtwin martensite. Dislocation pile-ups and twins were found to exist in the residual austenite.Microsegregation of composition and heterogeneity of microstructure were also apparent after lasermelting processing.

Key words: laser processing gray cast iron microstructure

Received: 18 January 1989

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1989/V25/I1/75

1 Hume-Rothery W. The Structures of Alloys of Iron, Oxford: Pergamon Press, 1966: 320
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