DYNAMIC IMPACT WEAR AND IMPACT RESISTANCE OF W-B-C COATINGS

Josef Daniel,Pavel Souček,Jan Grossman,Lukáš Zábranský,Petr Vašina,Saeed Mirzaei,Vilma Buršíková

doi:10.14311/app.2020.27.0037

Abstract

Coated components used in industry are often exposed to repetitive dynamic impact load. The dynamic impact test is a suitable method for the study of thin protective coatings under such conditions. Aim of this paper is to describe the method of dynamic impact testing and the novel concepts of evaluation of the impact test results, such as the impact resistance and the impact deformation rate. All of the presented results were obtained by testing two W-B-C coatings with different C/W ratio. Different impact test results are discussed with respect to the coatings microstructure, the chemical and phase composition, and the mechanical properties. It is shown that coating adhesion to the HSS substrate played a crucial role in the coatings’ impact lifetime.

Highlights

Used components coated with protective coatings are often exposed to the external load
The aim of this paper is to present some crucial results of dynamic impact testing, important for the investigation of the behavior of the coating under dynamic impact load and for development of the new types of the protective coatings
The detailed description of the chemical composition and the microstructure analyses, the evaluation of the mechanical properties and the discussion of the relationship between the microstructure and the mechanical properties can be found in Ref. [9]

Summary

Introduction

Used components coated with protective coatings are often exposed to the external load In some cases, this load may take the form of repeated dynamic impact. For the investigation of the lifetime of the coated components under this form of load, Knotek et al developed the method of dynamic impact test in the early 90s [1]. Voevodin et al investigated the impact lifetime of various Ti-based coatings and discussed it with respect to their chemical composition and hardness [5]. The aim of this paper is to present some crucial results of dynamic impact testing, important for the investigation of the behavior of the coating under dynamic impact load and for development of the new types of the protective coatings. Presented results were obtained from two W-B-C coatings with different chemical composition, structure, and mechanical properties

Objectives

Results

Discussion

Conclusion