The shallow cryogenic (subzero) treatment (SCT) effect on the mechanical properties of the bimetallic casting used in the crushing industry has been investigated. Examination methods include sand casting, heat treatment and SCT, Charpy impact test, optical microscope, scanning electron microscope, microanalysis of the chemical composition (energy dispersive spectroscopy—EDS), x-ray diffraction, and hardness measurement. Two bimetallic castings (single casting containing two layers, one of low-carbon cast steel-LCCS-back up part and other high Cr cast iron-HCCI-working part) have been prepared by the sand casting method. They have been subjected to diffusion annealing at 1040 °C for 5 h. One of them was quenched in pressurized air till 100 °C and was tempered at 270 °C for 3 h and, and the other one has been subjected to SCT at − 84 °C for 24 h and then tempered at 270 °C for 3 h. The impact toughness values before and after SCT are determined five Charpy specimens per point. Hardness values and metallography of samples have been analyzed and compared. A remarkable change was observed in hardness and impact energy/toughness before and after SCT.

已经研究了浅低温（零以下）处理（SCT）对破碎行业中使用的双金属铸件力学性能的影响。检验方法包括砂型铸造，热处理和SCT，夏比冲击试验，光学显微镜，扫描电子显微镜，化学成分的微观分析（能量分散光谱法-EDS），X射线衍射和硬度测量。通过砂型铸造法制备了两个双金属铸件（单层铸件包含两层，一个为低碳铸钢-LCCS后备零件，另一个为高铬铸铁-HCCI-工作零件）。它们已在1040°C下进行了扩散退火5小时。其中之一在加压空气中淬火至100°C，并在270°C下回火3 h，然后，另一个已在− 84°C下经受SCT 24小时，然后在270°C下回火3小时。确定SCT前后的冲击韧性值，每个点五个夏比试样。分析并比较了样品的硬度值和金相。在SCT之前和之后，硬度和冲击能/韧性均发生了显着变化。