RAPID GRAPHITIZATION OF A PULSED-LASER REMELTED DUCTILE CAST-IRON DURING MULTIPASS OVERLAP MELTING

被引：13

作者：

WANG, HM ^{[1
]}

BERGMANN, HW ^{[1
]}

机构：

[1] UNIV ERLANGEN NURNBERG,INST WERKSTOFFWISSENSCH MET 2,ALEXANDER VON HUMBOLDT FDN GERMANY,D-91058 ERLANGEN,GERMANY

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1995年 / 26卷 / 04期

关键词：

D O I：

10.1007/BF02649077

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As-cast ductile cast iron with an as-machined shiny metal surface was remelted with a high power (1 kW) pulsed Nd:YAG laser using both single- and multipass overlap melt tracks. Changes in the microstructure of the underlying laser melted track caused by the transient overlap heating during multipass overlap remelting process were studied. The rapidly solidified metastable ledeburite structure of the underlying laser melted track was found to be rapidly graphitized during overlap remelting. The graphitized zone consists of a fully graphitized zone containing extremely fine graphite nodules and a partially graphitized zone containing extremely fine graphite nodules and undissolved cementite. The overlap ratios of the melt tracks were shown to have no noticeable influence on either the graphitized microstructure and the size of the graphitization zones. This newly observed rapid graphitization phenomenon is preliminarily discussed in terms of the microstructural characteristics of the rapidly solidified ductile iron and the unique heating behavior of pulsed laser beam to material.

引用

页码：793 / 800

页数：8

共 26 条

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