Effect of quench-tempering and laser quenching on the microstructure and properties of high-chromium cast iron

• DOI: 10.1016/j.jmrt.2022.06.022
• Publication Date: 2022-06-09T23:25:11Z
• Authors: Chunlun Chen; Aixin Feng; Bingjie Liu; Yacheng Wei; Xiangyu Song
• Keywords: Tempering

In this paper, quench-tempering (QT) and laser quenching (LQ) treatments were performed on the high-chromium cast iron to obtain better microstructure mechanical properties. The changes in microhardness, microstructure, retained austenite (RA) content, grain size, phase elemental content of QT LQ samples compared analyzed. results showed that RA untreated was 77.02% 26.8 nm. an increase carbide dissolution, gradual rounding from sharp angles, transformation into martensite, reduction 28.48%, average size (AGS) 35.8 nm, surface microhardness by 16.6%, friction coefficient reduced 6.9%. a large amount fine daisy-like eutectic carbides diffusely distributed secondary carbides, 17.72%, with AGS 29.9 Compared samples, 25.1% AGS, 16.5% 9.7% decrease coefficient, which more wear resistant. However, hard brittle layer tended be source cracks during impact, resulting final 8.4% impact toughness samples.