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THERMAL FATIGUE OF A 12% CHROMIUM MARTENSITIC STAINLESS STEEL
Author(s) -
AlvarezArmas I.,
Armas A. F.,
Petersen C.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb00265.x
Subject(s) - materials science , lath , softening , martensite , microstructure , martensitic stainless steel , metallurgy , composite material , temperature cycling , deformation (meteorology) , thermal , thermodynamics , physics
— The cyclic mechanical behaviour during thermal fatigue of a martensitic stainless steel (MANET I) is investigated and correlated with its microstructure. The tests were performed in air by allowing the sample to serve as its own heater and converting any longitudinal thermal deformation of the specimen into elastic or inelastic deformation. The effects of different thermal cycling ranges and the imposition of several hold‐time conditions on the mechanical behaviour and the accompanying microstructural changes in the specimen were evaluated. A continuous softening is the characteristic feature observed in all thermal fatigue tests. Higher mean temperatures, larger temperature changes and the application of temperature‐hold periods produce an accelerated softening process. All temperature hold‐time conditions influence the mechanical behaviour, reducing the number of cycles to failure. The initial tempered martensite lath structure evolves to a mixed structure of expanded laths and subgrains or a fully subgrain structure, depending on the mean temperature, the temperature change and the temperature at which the hold period has been applied. Tests with temperature holds at higher temperatures show more deleterious effects than tests with hold‐times at lower temperatures.