Effect of preheating on microstructures and mechanical properties of K360 steel hardfacing layer
Abstract：This authors restored wear resistant steel K360 by using flux-cored wire hardfacing welding with CO2 as shielding gas, and base metal was preheated at different temperature before welding. Then, we carried out the test of microstructure,X-ray diffraction analysis for measuring hardness, impact toughness and wear resistance. The results show that the microstructure of different temperature preheating hardfacing layer is martensite, carbide, and a small amount of residual austenite. When the pre-heating temperature is about 150 ℃ and 200 ℃, the hardfacing layer has high hardness,impact toughness, wear resistance, and its wear resistance is up to 1. 583 times and 1. 494 times respec- tively. When the pre-heating temperature is about 250 ℃, the hardfacing layer is in lower impact toughness, mean- while, the wear resistance is degressive compared with that at 150 ℃ and 200 ℃. Compared to based metal, its wear resistance is only 1. 148 times of that.
Keywords：K360 steelhardfacingimpact toughnesswear resistance
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1412-1417 )