Кафедра литейного производства черных и цветных металлов

Национальный технический университет Украины "КПИ им. Игоря Сикорского"

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Yamshinskij M. HEAT-RESISTANCE OF HEAT-RESISTANT Cr-Al STEELS FOR WORK UNDER EXTREME CONDITIONS

Yamshinskij M. HEAT-RESISTANCE OF HEAT-RESISTANT Cr-Al STEELS FOR WORK UNDER EXTREME CONDITIONS

Abstract.

Results of influence of aluminum, titanium and niobium on thermal resistance and coefficient of elongation of molded samples from high chromium steels are presented. The optimal concentration ranges of aluminum and titanium in the heat resistant steel for providing maximum thermal resistance of molded parts with taking into account the technological properties of the alloys are determined. The influence of metallurgical and technological defects are determined. In particular, it was found that the greatest negative influence have microshrinkage cavities and nonmetallic inclusions in the structure. It was defined that for a reliable evaluation of heat-resistance for steels of different chemical content it makes sense to accept the amount of cycles until models’ disruption.

Keywords: Heat resistance, thermal resistance, high chromium steel, alloying, aluminum, titanium.

 

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