残余元素锡、锑对34CrNi3Mo钢冲击韧性的影响及稀土镧的改善作用

Improvement of Lanthanum on Impact Toughness of 34CrNi3Mo Steel Containing Sn,Sb Residual Elements

利用JB-30B型冲击试验机研究了不同含量的残余元素锡、锑及稀土镧对低氧、低硫的34CrNi3Mo钢冲击韧性的影响;采用SEM及EDS手段研究了稀土镧对不同锡、锑含量钢的断裂方式的影响以及在钢中形成化合物的情形.结果表明:稀土金属可以明显改善低氧、低硫钢中残余元素对钢性能的危害;镧可与钢中的残余元素作用形成复合相且分布均匀.

The effect of different residual element contents of tin and antimony and rare earth element lanthanum on the impact toughness of 34CrNi3Mo steel with low oxygen and sulfur contents was investigated with JB-30B impact test machine. SEM and EDS were used to study lanthanum effect on the fracture mode of the steel with different tin and antimony contents and the rare earth inclusions. The results show that rare earth metal lanthanum may decrease remarkably the harm of residual elements on the toughness of the steel and combine with residual elements in the steel to form La-Sb intermetallic compound and a little amount of La-Sn intermetallic compound, presenting orderly distribution.