Heat treatment process: It is difficult to quench the wear resistant cast ball, mainly because the quenching requires martensite, and the cooling rate must be higher than the critical cooling rate (VK). During quenching, how can martensite be obtained and the effect of stress reduced? This is a major problem in the quenching process. To […]
Dang Jun-peng (Aluminium corporation of China zhongzhou branch, Jiaozuo 454174, China) Abstract： High chromium cast iron is considered to be the best of the anti-wear properties and has a good toughness of the material, So in this cast iron abroad used widely. For years the ball from high chromium cast in the research and production […]
The tensile specimen (cast steel) is cut from the button spindle with the size as shown in Figure 5 and the thickness is 1mm.
HU Zhi-jun, ZHAO Xiao-peng, YANG Yi-tao (School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China) Abstract： The influences of normalizing and tempering temperature on mechanical properties and microstructure of low alloy wear-resistant cast steel were investigated by using a vacuum arc furnace in lab situations. The results show that normalizing can refine the […]
Without heat treatment, the as-cast cast iron grinding ball’s microstructure is austenite + eutectic carbide, which is heated at lower quenching temperature (such as below 950 °c). After Air Cooling, the microstructure contains austenite, eutectic carbide, and martensite; there is also a large troostite (see Fig. 2A). At higher quenching temperature (above 980 °C), the […]
Abstract: The effects of heat treatment on the hardness, impact toughness, and casting high chrome grinding ball’s microstructure have been investigated. The results show that the hardness of the ball quenched at 980 ℃and then tempered at 400 ℃ is up to 60. 5 HRC; meanwhile, the impact toughness of that ball is 6. 8J/ […]
Mao Shuang Liang, Shui Heng Yong, Chen Shan shan, Zhao Ai min ( 1. Shanxi Baiyi Machinery Co., Ltd., Taiyuan 030003, China; 2. Research Institute of Metallurgy Engineering, Beijing University of Science and Technical, Beijing 100083, China) Abstract: The chemical composition of Cr26 high chromium cast iron and the effects of heat treatment on its […]
In materials science, quenching is the rapid cooling of a workpiece in water, oil, or air to obtain certain material properties. For oil quenching furnace, it contents the process of heating and quenching. For casting grinding balls, quenching process can be oil quenching for common high chrome balls, air quenching for super high chrome alloyed grinding balls; and for […]
In materials science, quenching is the rapid cooling of a workpiece in water, oil, or air to obtain certain material properties. For oil quenching furnace, it contents the process of heating and quenching. For casting grinding balls, quenching process can be oil quenching for common high chrome balls, air quenching for super high chrome alloyed grinding balls; and for […]