Effects of cryogenic treatment on the wear properties of brake discs

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Nadig, D.S.^1 ; Shivakumar, P.^2 ; Anoop, S.^2 ; Chinmay, Kulkarni^2 ; Divine, P.V.^2 ; Harsha, H.P.^2

Centre for Cryogenic Technology, Indian Institute of Science, Bangalore, India^1

M.S. Engineering College, Bangalore, India^2

关键词: Coefficient of frictions;    High temperature;    High wear resistance;    Martensite stainless steel;    Rockwell hardness;    Rotational speed;    Wear behaviours;    Wear properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012152/pdf
DOI  :  10.1088/1757-899X/171/1/012152

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Disc brakes are invariably used in all the automobiles either to reduce the rotational speed of the wheel or to hold the vehicle stationary. During the braking action, the kinetic energy is converted into heat which can result in high temperatures resulting in fading of brake effects. Brake discs produced out of martensite stainless steel (SS410) are expected to exhibit high wear resistance properties with low value of coefficient of friction. These factors increase the useful life of the brake discs with minimal possibilities of brake fade. To study the effects of cryogenic treatment on the wear behaviour, two types of brake discs were cryotreated at 98K for 8 and 24 hours in a specially developed cryotreatment system using liquid nitrogen. Wear properties of the untreated and cryotreated test specimens were experimentally determined using the pin on disc type tribometer (ASTM G99-95). Similarly, the Rockwell hardness (HRC) of the specimens were tested in a hardness tester in accordance with ASTM E18. In this paper, the effects of cryotreatment on the wear and hardness properties of untreated and cryotreated brake discs are presented. Results indicate enhancement of wear properties and hardness after cryogenic treatment compared with the normal brakes discs.