铁路提速车辆组合式制动梁用钢的优化设计

Optimal Design of Combined Brake Beam Steel Used in Accelerated Railway Vehicle

基于微合金化原理,通过对四种化学成分配比进行研究,确定了微合金元素Nb、V、Cr和Ni优化配比的新型微合金钢设计方案,所制得的合金钢其强度、韧性和伸长率各项指标值均能达到铁路车辆制动梁用钢的标准要求。采用热轧工艺或控轧控冷工艺,均可获得金相组织为铁素体+珠光体+贝氏体的合金钢。控轧控冷工艺制得的合金钢晶粒更加细化,钢强度相对更高。采用正火加回火的热处理工艺,可获得组织更加均匀、晶粒更加细化和韧性更高的合金钢。

By studying four samples with different chemical composition, a new plan of micro-alloy steel, adding Nb, V, Cr and Ni with a right proportion, was finally laid down based on the principle of micro-alloying. All the tested parameters of the sample meet the standards of the steel using in combined brake beam of rolling stock, such as strength, toughness and elongation. The micro-alloy steel with F＋P＋B microstructure could be prepared by hot rolling process or TMCP process. The sample prepared by TMCP process has finer grain and relatively higher strength. The sample after normalizing and tempering process, has more uniform microscopic structure, finer grains and better toughness.