Low-temperature cementation _ perspective technology of hardening of toothed parts

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

Shveyova, T.V.^1 ; Shveyov, A.I.^1

Kazan Federal University, Russia^1

关键词: Chemical heat treatment;    Endothermic atmosphere;    Gear wheel;    Geometrical accuracy;    Hydrogen saturation;    Low temperatures;    Run outs;    Structure , properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012056/pdf
DOI  :  10.1088/1757-899X/525/1/012056

来源: IOP

【 摘 要 】

The structure, properties and geometrical accuracy of gear wheels after chemical heat treatment which cementation was carried out at 930°C and 870°C are investigated. Advantage of low-Temperature cementation of toothed parts in size of a radial runout, fluctuation of a side clearance, ovality of an internal opening and the area of a spot of contact between teeths of the strengthened gear wheels is shown. Influence of structure of the endothermic atmosphere on mechanical properties and intensity of saturation by carbon steel 15HGN2TA and 20HGNMTA is investigated. It is established that increase in content of hydrogen from 20% to 40% in the endoatmosphere increases saturation speed carbon steel by 10-34%, excludes their hydrogen saturation and keeps indicators of mechanical properties of the cemented parts. The technology of chemical heat treatment of toothed parts including cementation at 870°C in the endothermic atmosphere containing 40% of hydrogen in the structure is developed and recommended for application.