Effect of postdeformation tempering on the microhardness of martensite in hydrostatically extruded steel 9KhS
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Hydrostatic extrusion of tool steel 9KhS increases the microhardness of martensite, which is highest after tempering at 500°C.
The main structural changes occurring in hydrostatically extruded steel 9KhS in the process of tempering at 500°C and favoring retention of high dislocation density during subsequent heating to austenitizing temperature are polygonization and pinning of dislocations by precipitates. Higher tempering temperatures induce recrystallization and thus reduce the effect from hydrostatic extrusion.
KeywordsMartensite Recrystallization Structural Change Dislocation Density Tool Steel
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