Increasing the Contact Strength and Wear Resistance of ShKh15 Steel at Rolling Motion by Using Integral Technologies in a Glow Discharge
V. G. Kaplun, P. V. Kaplun, V. A. Gonchar, T. V. Donchenko
Khmelnytskyi National University, 11 Instytutska Str., UA-29016 Khmelnytskyi, Ukraine
Received: 15.03.2019; final version - 29.06.2019. Download: PDF
The comparative tests of back-to-back endurance of steel ShKh15 in the process of rolling friction are carried out for different experimental conditions: without thermal processing, after hardening, with the use of ion nitriding technique in hydrogen-free saturating medium and integral techniques of nitrite hardening and oxinitrite hardening. The tests are conducted with point and linear contacts in the I-20 oil. As determined, the durability of steel samples without thermal processing after ion nitriding is 1.3 times higher than for non-nitrided samples. Durability of nitrided samples after quenching at temperature starting from 860°C is more than 20 times higher than for nitrided samples without thermal processing because of higher base hardness. After nitrite and oxinitrite hardening samples have the highest durability at the process of rolling friction, which is 1.8–2 times higher than the value of hardened samples. It is caused by the higher hardness of surface and base, a bigger thickness and a smaller gradient of the hardness of nitrided layer, and optimal residual compressive stress in a surface layer.
Key words: ion nitriding, hardening, nitrite hardening, oxinitrite hardening, contact strength, wear.
PACS: 62.20.fk, 62.20.me, 62.20.Qp, 81.05.Bx, 81.40.Ef, 81.40.Np, 81.40.Pq
Citation: V. G. Kaplun, P. V. Kaplun, V. A. Gonchar, and T. V. Donchenko, Increasing the Contact Strength and Wear Resistance of ShKh15 Steel at Rolling Motion by Using Integral Technologies in a Glow Discharge, Metallofiz. Noveishie Tekhnol., 41, No. 10: 1331—1344 (2019) (in Russian)