| 摘要 |
Alloy steels that combine high strength and toughness with high corrosion resistance are achieved by a dislocated lath microstructure, in which dislocated martensite laths that are substantially free of twinning alternat e with thin films of retained austenite, with an absence of autotempered carbides, nitrides and carbonitrides in both the dislocated martensite laths and the retained austenite films. This microstructure is achieved by selecti ng an alloy composition whose martensite start temperature is 350 ~C or greater , and by selecting a cooling regime from the austenite phase through the martensite transition region that avoids regions in which autotempering occu rs.
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