中国铸造2009，Vol.6Issue(3)：185-190,6.
In-situ SEM observation on fracture behavior of austempered silicon alloyed steel
In-situ SEM observation on fracture behavior of austempered silicon alloyed steel
摘要
Abstract
Crack initiation,propagation and microfracture processes of austempered high silicon cast steel have been investigated by using an in-situ tensile stage installed inside a scanning electron microscope chamber. It is revealed that micro cracks always nucleate at the yielding near imperfections and the boundary of matrix-inclusions due to the stress concentration. There are four types of crack propagations in the matrix:crack propagates along the boundary of two clusters of bainitic ferrite;crack propagates along the boundary of ferrite-austenite in bainitic ferrite laths;crack propagates into bainitic ferrite laths;crack nucleates and propagates in the high carbon brittle plate shape martensite which is transformed from some blocky retained austenite due to plastic deformation.Based on the observation and analysis of microfracture processes,a schematic diagram of the crack nucleation and propagation process of high silicon cast steel is proposed.关键词
high silicon cast steel/bainitic ferrite/austempering/in-situ SEM observation/fractureKey words
high silicon cast steel/bainitic ferrite/austempering/in-situ SEM observation/fracture分类
矿业与冶金引用本文复制引用
Chen Xiang,Vuorinen Esa,Grahn Jonny..In-situ SEM observation on fracture behavior of austempered silicon alloyed steel[J].中国铸造,2009,6(3):185-190,6.基金项目
The study was financially supported by Swedish Institute of Sweden (No. 200/01954/2007/China Bilateral programme). （No. 200/01954/2007/China Bilateral programme）
