Microstructural and Tribological Resistance of Flame-Sprayed CoMoCrSi/WC-CrC-Ni and CoMoCrSi/WC-12Co Composite Coatings
- PDF / 3,939,471 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 20 Downloads / 164 Views
Microstructural and Tribological Resistance of Flame‑Sprayed CoMoCrSi/WC‑CrC‑Ni and CoMoCrSi/WC‑12Co Composite Coatings Remelted by Microwave Energy C. Durga Prasad1 · Sharnappa Joladarashi2 · M. R. Ramesh2 · M. S. Srinath3 Received: 11 April 2020 / Revised: 20 August 2020 / Accepted: 4 September 2020 © Springer Nature Switzerland AG 2020
Abstract The hard facing composite coatings such as CoMoCrSi/30%WC-CrC-Ni and CoMoCrSi/30%WC-12Co are coated on grade-2 titanium substrate through Flame spray technique. Prior to deposition of coatings CoMoCrSi feedstock were processed using high energy ball milling to obtain intermetallic laves phases. The sprayed coatings are subjected to post-heat treatment through microwave energy to homogenize coating structure which reduces surface defects and to achieve metallurgical bonding. The as-sprayed and microwave treated coatings are examined for metallography analysis by using XRD, SEM–EDS and mechanical properties are estimated by using microhardness, universal tensile equipment. The high-temperature sliding wear tests are performed against alumina counterpart under dry conditions. The sliding wear test is conducted with normal loads of 10 N and 20 N at a sliding velocity of 1.5 m/s with a constant sliding distance of 3000 m. Microwave treated coatings obtained homogeneous structure and metallurgical bonding with improved hardness. Fused coatings revealed better wear resistance due to formation of oxides and fatigue spalling mechanism. Keywords CoMoCrSi · Homogenize · Flame spray · Microwave energy · High-temperature wear
1 Introduction The surfaces of titanium and most of its alloys have relatively poor wear resistance and also it is prone to oxidation and oxygen-induced embrittlement at temperatures above 600 °C [1]. All materials do wear to some extent and usual solution to minimize that is the proper configuration of mating surfaces or wise choice of lubricants [2]. In metals, wear usually occurs by plastic displacement and detachment of the surface particles. Wear rate is affected by many factors such as, the type of loading, type of motion and temperature.
* C. Durga Prasad [email protected] 1
Department of Mechanical Engineering, RV Institute of Technology and Management, Bengaluru, Karnataka 560076, India
2
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
3
Department of Industrial and Production Engineering, Malnad College of Engineering, Hassan, Karnataka, India
Loading may be of static, dynamic, impact and motion may be of sliding, rolling [3]. The cost of engineering material loss due to several surface degradations may reach 4% of gross internal product (GIP) is facing by most of the countries. For instance, in the United States alone it is seen that the wear and corrosion of spare parts cost around 22 billion Euros per year [4]. Besides this, an indirect cost involved in the production, scrap management, maintenance, adds up to the cost of material and thereby increases the cost of the
Data Loading...
