摘要
本文借助光学显微镜,透射电镜和扫描电镜,分析了HT20-40灰铸铁于激光熔化处理后表面显微组织特征,并探讨其形成原因。
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.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第1期A075-A077,共3页
Acta Metallurgica Sinica
关键词
灰铸铁
激光
熔化
显微组织
laser processing
gray cast iron
microstructure
