Wear Characteristic of Stellite 6 Alloy Hardfacing Layer by Plasma Arc Surfacing Processes.

Zhiyuan Zhu,Chun Ouyang,Yanxin Qiao,Xiaowei Zhou

doi:10.1155/2017/6097486

Abstract

The microstructure and wear resistance of Stellite 6 alloy hardfacing layer at two different temperatures (room temperature and 300°C) were investigated by plasma arc surfacing processes on Q235 Steel. Tribological test was conducted to characterize the wear property. The microstructure of Stellite 6 alloy coating mainly consists of α-Co and (Cr, Fe)7C3 phases. The friction coefficient of Stellite 6 alloys fluctuates slightly under different loads at 300°C. The oxide layer is formed on the coating surface and serves as a special lubricant during the wear test. Abrasive wear is the dominant mechanism at room temperature, and microploughing and plasticity are the key wear mechanisms at 300°C.

Highlights

Cobalt- (Co-) based alloys (e.g., Stellite alloy) are widely used in the wear environment because of their good resistance to corrosion, wear, and abrasion [1]
This study aims to evaluate the effect of temperature on wear resistance, which is the working temperature of the valve in real application
The phases of deposited coating are α-Co and M7C6 (M = Fe, Cr), which are determined by comparison with the lattice

Summary

Introduction

Cobalt- (Co-) based alloys (e.g., Stellite alloy) are widely used in the wear environment because of their good resistance to corrosion, wear, and abrasion [1]. Stellite systems are Co alloys that mainly contain alloying elements, such as tungsten (W), chromium (Cr), molybdenum (Mo), and a certain amount of carbon (C). Cr is the main alloying element that reacts with C to form interdendritic carbide. The alloying elements W and Mo react with C to form carbide as secondary particles. Solid solution strengthening of Co-based alloys with carbides can be achieved. The distribution, size, and shape of carbides are determined by the processing condition and affect the mechanical properties and hardness [2,3,4,5]

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Conclusion