车轴是机车车辆的重要部件之一。车轴质量影响着铁路的安全运输。影响车轴寿命的因素很多。就目前所发生的事故来看,晶粒粗大是原因之一。有些发生断裂的车轴,其晶粒度仅1—2级。众所周知,细化晶粒是一种极为有效的强韧化手段。因此多年来,国内外对奥氏体晶粒的长大机理,以及影响奥氏体晶粒长大倾向的因素进行了广泛的研究。 Axles are one of the most important parts of rolling stock. Axle quality affects the safe transport of the railway. Many factors affect the life of the axle. Judging from the current accident, the grain coarsening is one of the reasons. Some broken axles, the grain size of only 1-2. As we all know, grain refinement is an extremely effective toughening method. Therefore, over the years, the growth mechanism of austenite grains at home and abroad, as well as the factors that affect the tendency of austenite grain growth have been extensively studied.