The high-temperature pseudo-invar effect in multilayer steel materials

Fourth interdisciplinary scientific forum with international participation "New materials and promising technologies"

Kabantseva, V.E.^1 ; Safonov, M.D.^1 ; Plokhikh, A.I.^1

Department of Material Science, Bauman Moscow State Technical University (BMSTU), 2nd Baumanskaya street, 5-1, Moscow

105005, Russia^1

关键词: Adjacent layers;    Coefficients of thermal expansions;    Cyclic heating;    High temperature;    High temperature impact;    Interlayer boundaries;    Metallographic analysis;    Steel materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012038/pdf
DOI  :  10.1088/1757-899X/525/1/012038

来源: IOP

【 摘 要 】

The paper presents the results of research into Coefficients of Thermal Expansion (CTE) in multilayer steel material produced by hot pack rolling. It has been discovered that the material comprised of interleaving layers of steel features abnormally low CTE values in the direction normal to the rolling plane. A hypothesis has been proposed to explain the phenomenon by an interrelation between normal and tangent stresses generated in the interlayer boundaries within the material. A leading role of reactive stresses is confirmed by the results of the metallographic analysis. It has been shown that cyclic heating at a high temperature provokes recrystallization on the interlayer boundaries due to the difference between the CTE values of the adjacent layers and the high-Temperature impact.