材料工程2016，Vol.44Issue(8)：77-84,8.DOI:10.11868/j.issn.1001-4381.2016.08.013
热浸镀铝球墨铸铁失效机理研究
Failure M echanism of Ho t Dip Aluminized Ductile Iron
雍薇 1黄兴民 1张雷 1程乾 1戴光泽1
作者信息
- 1. 西南交通大学材料科学与工程学院，成都610031
- 折叠
摘要
Abstract
Using laser scanning confocal microscope ,failure process of aluminized ductile iron samples w ere in‐situ observed during three‐point bending test ,w hile crack initiation and propagation mecha‐nism were analyzed in the area of coating and matrix .The results show that for hot‐dipped samples in Al ,cracks mainly initiate in the Fe‐Al alloy coating under tensile stress ,then induce the tearing of ferrite and the peeling of graphite in the adjacent matrix .T hereby cracks spread to the inner matrix in shortest route between graphite and ferrite ,in the direction nearly vertical to tensile stress .In case of compression stress ,aluminized alloy layer is crushed and aluminum layer is peeled off ,w hich having little influence on the failure of matrix .For hot‐dipped samples in Al‐3 .7Si‐1 .0RE ,failure mechanism under tensile stress is similar to that of hot‐dipped samples in Al ;under compression stress ,alumi‐num and Fe‐Al alloy coatings are disengaged from matrix ,exhibits failure occurring in the ferrite ma‐t rix .关键词
球墨铸铁/热浸镀铝/原位观察/失效机理Key words
ductile iron/hot-dip aluminizing/in-situ observation/failure mechanism分类
矿业与冶金引用本文复制引用
雍薇,黄兴民,张雷,程乾,戴光泽..热浸镀铝球墨铸铁失效机理研究[J].材料工程,2016,44(8):77-84,8.
