过冷奥氏体高速冷却，几乎全部形成脆硬的马氏体薄层，造成踏面剥离。
The supercooled austenite transforms into friable martensite layer during the following rapid cooling process, leading to cracking and spalling at wheel tread.
而铌元素的加入增大了过冷奥氏体的稳定性，相变点温度降低，并且推迟珠光体的转变。
But Nb adding increases the under-heating austenite stability, reduces the temperature of phase transformation point and postpones the transformation of pearlite.
结果表明：稀土使钢的过冷奥氏体转变曲线右移，在同样冷却速度下，加稀土钢的硬度增加。
The result shows that the RE make CCT curve move towards right and hardness of steel increases at same rate of cooling.
结果表明：稀土使钢的过冷奥氏体转变曲线右移，在同样冷却速度下，加稀土钢的硬度增加。
The result shows that the RE make CCT curve move towards right and hardness of steel increases at same rate of cooling.
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