Characteristics of Hardness of (Cr, Fe)_7C₃ in the Chromium-Carbide-Type Chromium White Iron Hardfacing Weld Deposits

Baek, Eung-Ryul

Journal of KWJS 2005;23(2):75-80.
Published online May 12, 2005.

[연구논문]크롬탄화물형 크로백철 오버레이 용착금속에서의 (Cr, Fe)_7C₃의 경도특성

Characteristics of Hardness of (Cr, Fe)_7C₃ in the Chromium-Carbide-Type Chromium White Iron Hardfacing Weld Deposits

Abstract

The effect of chemical constituents of (Cr, Fe)_7C₃ carbide phase on its hardness in the chromium-carbide type Cr white iron hardfacing weld deposits has been investigated. In order to examine (Cr, Fe)_7C₃ carbide phase, a series of filler metals with varying chromium contents was used. The alloys were deposited once or twice on a mild steel plate using the self-shielding flux cored are welding process. The hardness of (Cr, Fe)_7C₃ carbide phase was measured by the micro-Vickers hardness test. It was shown that hardness of (Cr, Fe)_7C₃ carbide phase increased with increasing Cr content in (Cr, Fe)_7C₃ carbide phase. This behavior of the hardness of (Cr, Fe)_7C₃ carbide phase was explained by the types of chemical bonds that hold atoms together in (Cr, Fe)_7C₃ carbide phase.