Effect of microstructure and heat treatment on the elastic limit of steel Kh15N9Yu
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With increasing cold plastic deformation of steel Kh15N9Yu the amount of martensite and the elastic limit increase.
Tempering at 450–500° has almost no effect on the amount of martensite. However, the elastic limit increases 30–60% due to precipitation hardening and redistribution of dislocations.
The elastic limit of steel Kh15N9Yu depends not only on the amount of martensite but also the fine structure-tempering at 550–700° increases the amount of martensite but reduces the elastic limit. The elastic limit is highest for martensite obtained by cold plastic deformation and strengthened by precipitation hardening.
In steels of the austenitic-martensitic transition class the phase composition varies through the section-the surface layers contain a larger amount of martensite than deeper layers.
KeywordsPrecipitation Microstructure Heat Treatment Surface Layer Martensite
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