文摘：分析大型轴类的内部组织特点，以及其热状态下的吊装方式与小件的不同，制定适合大型滚筒轴的调质工艺。

Abstract: This paper analyses organize characteristic interior of large axle and hoisting way under hot status. It is different from small piece. Modified technique of large drum axle are work out.

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调质处理前焊缝和热影响区中晶粒尺寸分布较为均匀，而调质处理后主要以小尺寸晶粒为主。

Before QT treatment, grain size distributions in weldment and matrix are relatively homogenous, while after QT treatment the small grains are preponderant.

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在热模拟试验机上研究了控轧控冷工艺对微合金化低碳贝氏体型非调质钢组织性能的影响，并探讨了贝氏体转变机制问题。

The effect of TMCP parameters on microstructure and property was studied, and a controversial question about bainite transformation mechanism also was discussed.

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