Creep of ChNKhMD Heat-Resistant Cast Iron under Tensile and Compression

Abstract

High-strength heat-resistant cast iron is widely used in production of sleeve assemblies for modern transport diesel engines operating under varying loads. High temperatures entail the development of irreversible creep strain resulting in residual tensile stresses after the engine stopping. To calculate the level of residual stress it is necessary to have information on the creep of heat-resistant iron which can be obtained experimentally. Thus, we used data of tension and compression tests of the specimens in creep conditions to derive an analytic dependence (state equation) valid for calculations at variable temperatures and stresses which describes the first and second creep stages. The resulting state equation can be used for calculations of ChNKhMD heat-resistant cast iron under creep conditions at a temperature up to 500°C.