フェライト系ステンレス鋳鋼の熱疲労特性

概要

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The exhaust components of automobile engines are being made of ferritic stainless steel or ferritic stainless cast steel in place of ductile cast iron for not only improving heat resistance but also weight saving. The thermal fatigue properties are most important for these.We performed the thermal fatigue test with external restraint and the thermal shock test with internal restraint for various ferritic stainless cast steels and ductile cast iron. The plastic deformation caused by thermal stress through ferritic stainless cast steels can be evaluated by measuring the dimensional change of specimen after the thermal shock test. It decreases by increasing high temperature strength and increases by crystalline transformation. A ferritic stainless cast steel composed of 0.05%C-19%Cr-1%Nb-2%W makes the longest thermal fatigue life and the least plastic deformation of all tested steels.
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