Effect of Cooling Rate on the Room Temperature Microstructure Following the Intercritical Deformation of Steel S460
The effect of final hot rolling in the intercritical (α+γ) region on microstructure and properties is very specific to the individual processing conditions and the chemical composition of a steel. S460 is a plate steel processed in this way.To reproduce at the laboratory scale, a multi-stage simulation was developed which included a high temperature austenite deformation and an isothermal hold. The effect of the applied cooling rate following intercritical deformation was investigated.At 1K/s (typical industrial cooling) the microstructure was similar to the reference sample, but included an intragranular ferrite fraction.This was due to differences in processing history, and considered to be linked to a larger prior austenite grain size.At an accelerated cooling rate (15K/s),acicular ferrite formed on shear bands within the strained austenite phase. EBSD scans have been completed to provide further information about the microstructures, with band contrast able to identify the pearlite phase at the slowest cooling rate.This is a starting point from which to focus on the ferrite morphologies.
Intercritical Deformation Cooling Rate Laboratory Simulation Plate Steel cicular Ferrite
HINTON John S PALMIERE Eric J RAINFORTH W.Mark
IMMPETUS,Dept.Of Materials Science and Engineering,The University of Sheffield,Mappin St, Sheffield,South Yorkshire, S1 3JD,UK
国际会议
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)
北京
英文
358-361
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）