重熔过共晶Fe-C-B合金初生Fe_2B的凝固遗传及消除

Heredity of primary Fe_2B in remelted hypereutectic Fe-C-B alloys and its uniform treatment

通过重熔和施加脉冲电流,研究了过共晶Fe-C-B合金凝固组织中初生Fe2B的遗传性和消除方法.当不施加电脉冲时,重熔难以有效消除过共晶Fe-C-B合金初生Fe2B的凝固遗传性.重熔温度较低时施加电脉冲影响凝固组织中初生Fe2B的空间分布但不改变其长杆状形态.提高重熔温度并施加电脉冲能消除凝固组织遗传的影响,使Fe2B由长杆状转变为颗粒状,并明显减少Fe2B的析出.

ABSTRACT The heredity of primary Fe2 B in the solidification structure of hypereutectic Fe-C-B alloys and a uniform treatment method were investigated by remelting and electric pulse treatment. The results show that it is difficult to eliminate the heredity of primary Fe2 B only by remelting. When exerting electric pulse at a lower remelting temperature, it changes the distribution of primary Fe2 B in the solidification structure but does not change the long rod shape. But when exerting electric pulse at a higher remelting temperature, it can eliminate the effect of solidification structure heredity, the shape of Fe2 B changes from the long rod shape to particle shape, and the precipitation of Fe2 B decreases obviously.