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采用旋转管状炉方法以固定的渗铬配方、相同的温度与时间,对冷、热工具钢、高碳工具钢、中碳铬钼合金钢4种试样分别做渗铬处理及渗铬后淬回火处理,将处理好的试片分别以X-光衍射分析试验来分析铬硬质层的成分,利用微小硬度机量测其表面渗铬层微硬度值,并以耐磨耗试验测试其耐磨性,比较钢材在渗铬后和渗铬后淬回火处理两种方法性能之差异。由试验结果发现SCM440、SKD61、SK3和SKD11试片渗铬后表面生成Cr_3C_2、Cr_(23)C_6与Cr_7C_3碳化铬层,淬回火后渗铬层平均膜厚分别为14.81、16.20、17.50和18.80μm,其硬度分别为1 633、1 653、1 883和1 821 HV。钢材含碳量越高则渗铬层越厚且越硬,反之含碳量越小则渗铬层越薄且硬度也较软,基材渗铬后需经过淬回火其硬度值才会提升,且经淬回火后的渗铬层其硬度、膜厚、组织等,皆无剧烈改变。经耐磨耗试验得知含碳量高的材质其膜厚最厚,硬度最硬,耐磨性也最好。
The rotary tube furnace method was used to make four kinds of samples of cold, hot tool steel, high carbon tool steel and medium carbon chromium-molybdenum alloy steel, respectively, with the chromizing treatment and the chromizing-quenching after fixed chromizing recipe, same temperature and time Tempering, the treated specimens were analyzed by X-ray diffraction analysis of the composition of chromium hard layer, the use of micro-hardness of the surface micro-hardness of the chromizing layer value, and wear resistance test test its Wear resistance, comparison of steel after chromizing and quenching and tempering after chromizing two methods of performance differences. The experimental results showed that Cr 3 C 2, Cr 23 C 6 and Cr 7 C 3 chromium carbide layers were formed on the surface of SCM440, SKD61, SK3 and SKD11 specimens after chromizing. The average thickness of chromizing layer after quenching and tempering was 14.81, 16.20, 17.50 and 18.80 μm and hardness of 1 633, 1 653, 1 883 and 1 821 HV, respectively. The higher the carbon content of steel, the thicker and harder the chromizing layer. On the contrary, the smaller the carbon content, the thinner the chromizing layer and the softer the hardness, the hardness value of the base material needs to be quenched and tempered to improve the hardness value , And quenching and tempering after the chromizing layer hardness, film thickness, tissue, etc., are not drastic changes. Abrasion resistance test that the material with high carbon content of the thickness of the thickest, the hardest hardness, abrasion resistance is also the best.