The Evolution of Ultrafine Grained Structure Formation Through Isothermal Static Phase Transformation

摘要：

In the current study, a 0.3C-2Si-2Mn-0.28Mo (in wt％) steel with high hardenability was deformed at a relatively low temperature followed by isothermal static phase transformation. This novel thermomechanical processing made it possible to successfully produce an ultrafine ferrite grained structure (～2 μm) in the absence of both dynamic phase transformation and controlled cooling.The use of a model Ni-30Fe austenitic alloy showed that the low temperature deformation induced very fine intragranular defects throughout the microstructure, which would then act as fine spaced ferrite nucleation sites at an early stage of phase transformation.As a result,the coarsening of ferrite was extremely limited during isothermal phase transformation,resulting a very fine ferrite grained structure;even nanoscale in the region of the prior austenite grain boundary.

关键词： ultrafine ferrite warm deformation isothermal phase transformation substructure

作者: HOSSEIN Beladi ILANA B.Timokhina SUBRATA Mukherjee PETER D.Hodgson

作者单位: Centre for Material and Fibre Innovation,Deakin University,Geelong,Australia,Vic 3216

会议类型: 国际会议

会议名称: The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

会议地点: 北京

会议语种:英文

页码: 281-284

在线出版日期: 2011-05-31（万方平台首次上网日期，不代表论文的发表时间）