| 摘要 |
PROBLEM TO BE SOLVED: To produce steel with high strength and toughness with high corrosion resistance.SOLUTION: Alloy steel that combines high strength and toughness with high corrosion resistance is achieved by a dislocated lath microstructure, in which dislocated martensite laths that are substantially free of twinning alternate with thin films of retained austenite, with absence of autotempered carbides, nitrides and carbonitrides in both the dislocated martensite laths and the retained austenite films. This microstructure is achieved by selecting an alloy composition whose martensite start temperature is 350°C or higher, and by selecting a cooling regime from the austenite phase through the martensite transition region that avoids regions in which autotempering occurs. |
