Residual Stress, Structure and Other Properties Formation by Combined Thermo-Hardening Processing of Surface Layer of Gray Cast Iron Parts

7th International Scientific and Practical Conference on Innovations in Mechanical Engineering

机械制造;材料科学

Rakhimyanov, Kh.M.^1 ; Nikitin, Yu.V.^1 ; Semenova, Yu.S.^1 ; Eremina, A.S.^1

Faculty of Mechanical Engineering and Technologies, Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk

630073, Russia^1

关键词: Combined processing;    Deformation effects;    Low temperature plasma source;    Low temperature plasmas;    Stress strain state;    Structural transformation;    Surface deformation;    Surface plastic deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/126/1/012019/pdf
DOI  :  10.1088/1757-899X/126/1/012019

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The proposed combined thermo-hardening processing of gray cast iron enables to control the surface layer structure and mechanical properties formation. The processing includes high-speed heating by low-temperature plasma source and ultrasonic surface plastic deformation. The algorithm of calculation the stress-strain state of a surface layer at combined processing of gray cast iron is developed. This algorithm is based on method of sections. The ultrasonic surface deformation contribution is determined during formation of residual stresses. It is established that the combination of the thermal and deformation effects on the material provides an additional increment of microhardness and increase of surface layer thickness. Experimental results shows that the features of structural and phase transformations in a surface layer are revealed without a surface melting by energy of low-temperature plasma. The top of a layer does not contain inclusions of graphite that testifies to change of structural transformations in conditions of combined processing.