EFFECT OF SULFUR ON PROPERTIES OF BALL BEARING STEEL

5 heats of GCr15 bearing steel of different sulfur contents ranging from 0.009-0.092% (wt.)were smelted. The role of sulfur in bearing steel and its effect on contact fatigue properties andfracture toughness K_(IC)Were studied. It was shown that as the sulfur content increases the sulfur content dissolved in the steelsubstrate remains unchanged. The best contact fatigue property appears at the sulfur content of0.045% (wt.), and the influence of sulfur content on the fracture toughness of bearing steel is notobvious. Finally, the mechanism of the role of sulfur was investigated.     

硫对轴承钢性能的影响——断裂韧度K_(IC)和接触疲劳性能

冶炼了五炉不同硫含量(在0.009—0.092wt.％范围内)的GCr15轴承钢,系统地研究了轴承钢中硫的作用及对接触疲劳性能和断裂韧度K_(IC)的影响规律。结果表明:随硫含量提高,钢基体中固溶的硫含量不变;硫含量为0.045wt.％的轴承钢接触疲劳性能最好;硫对轴承钢断裂韧度影响不显著。最后对硫的作用机理进行了探讨。同时,对现行标准中硫及硫化物控制提出了建议。     

光电自动报靶系统的设计与实现

介绍了一种光电自动报靶系统的设计方案,该系统通过检测子弹上靶时对激光网络的阻断情况对弹着点进行定位。能够达到较高精度,并能大大减少错报和漏报的情况。该系统精度高、成本低、安全可靠,能够很好地应用于部队训练和射击比赛中,有着重要的实际意义和良好的应用前景。