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首页> 外文期刊>ISIJ international >Austenite Grain Boundary Pinning during Reheating by Mixed AlN and Nb(C,N) Particles
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Austenite Grain Boundary Pinning during Reheating by Mixed AlN and Nb(C,N) Particles

机译：AlN和Nb（C，N）混合粒子在再加热过程中的奥氏体晶界钉扎

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摘要

The present study investigates the role of aluminium nitride (AlN) on grain boundary pinning during reheating in presence of niobium carbonitrides (Nb(C,N)) and subsequent evolution of grain size distribution. Three as continuously cast slabs of high strength low alloy steels containing different levels of Nb (between 0.045 – 0.019 wt%) and Al (between 0.057 – 0.02 wt%) have been characterized in terms of phase balance, ferrite grain size distribution and particle size distribution. Precipitate distributions have also been determined following simulated reheating schedules. The prior austenite grain size distributions after reheating have been correlated with precipitate distribution. Quantification of precipitate and prior austenite grain size distributions after reheating unveils the governing mechanisms for precipitate dissolution/coarsening. It is observed that grain boundary pinning is controlled by AlN at temperatures below 1125°C, but by Nb(C,N) at higher temperatures.
机译：本研究调查了在存在碳氮化铌（Nb（C，N））的情况下再加热期间氮化铝（AlN）对晶界钉扎的作用以及随后晶粒尺寸分布的演变。在相平衡，铁素体晶粒度分布和粒径方面，对三块连续铸造的高强度低合金钢坯进行了表征，其中分别含不同水平的Nb（0.045 – 0.019 wt％）和Al（0.057 – 0.02 wt％）分配。还按照模拟的再加热时间表确定了沉淀物的分布。再加热后的先前奥氏体晶粒尺寸分布与沉淀物分布相关。二次加热后沉淀物和先前奥氏体晶粒尺寸分布的量化揭示了沉淀物溶解/粗化的控制机制。可以看出，在低于1125°C的温度下，AlN可以控制晶界钉扎，而在更高的温度下，Nb（C，N）可以控制晶界钉扎。

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