冷却制度对铁素体基Ti-Mo微合金钢超细碳化物析出行为的影响  

Effect of Cooling Regime on Precipitation of Ultra-fine Carbides of Ti-Mo Ferrite Matrix Microalloyed Steel

作　　者：孙超凡[1] 蔡庆伍[1] 陈振华[1] 陈宏振[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《材料工程》2014年第10期47-52,共6页Journal of Materials Engineering

基　　金：国家自然科学基金面上项目(51274036)

摘　　要：采用SEM、TEM和SAXS研究了轧后γ→α相变过程以及γ→α相变后冷却速率对（Tix，Mo1-x）C粒子析出行为的影响。结果表明：在γ→α相变温度范围内采用较快的冷却速率可以使相间析出的（Tix，Mo1-x）C粒子尺寸更细小，分布更均匀，这些粒子尺寸多数在1～10nm；γ→α相变完成后缓慢冷却可以使（Tix，Mo1-x）C粒子在α基体中进一步弥散析出，这类弥散析出的粒子形成温度低，尺寸细小均匀。The effect of different cooling rates on the precipitation of （Tix,Mol-x）C particles was investigated by SEM,TEM and SAXS. The result show that a larger number of finer and more uniform precipitates can be obtained through inter-phase precipitation under the condition of a higher cooling rate during γ→αtransformation, the size of these inter-phase precipitation particles are mostly 110nm. A further dispersion precipitation in ferrite matrix occured under a relatively slower cooling rate afterγ→αtransformation, these superfine dispersion precipitation particles helps to obtain a higher proportion of single nanometer-sized particles in microalloyed steel.

关 键 词：冷却制度 Ti-Mo微合金钢 相间析出 超细碳化物 

分 类 号：TG142.2[一般工业技术—材料科学与工程]