It can be seen that the impact toughness of the flash welding heat affected zone above -20 ° C has been reduced in the area of ​​1300C thermal cycling, the area subjected to 760 ° C thermal cycle has been improved, and the impact toughness of hot welding above -20 ° C has experienced 760C thermal cycling Significantly improved, the organization is fine pearlite. Therefore, BNbRE can be heat treated to improve the toughness of the rail. For the impact toughness below -20C, the 1300C thermal cycle area is basically unchanged. The impact toughness of the 1300C heat-affected zone of the BNbRE heavy rail is compared with the foreign rail. Japanese steel pipe NKK, Nippon Steel, NSC, former Soviet Union, France, Austria, hot-rolled rail flash welding are at the same level. The longitudinal hardness distribution of the heat-affected zone of the BNbRE simulated sample after 1300C thermal cycle treatment is shown in the figure. The hardness distribution diagram of the BNbRE heat-affected zone can be seen. The base material is 8RC high, and there is no obvious decrease in the hardness of the joint. This shows that after the flash welding and thermite welding of the BNbRE heavy rail, there will be no weak areas in the joint. There will be no weak areas of hardness.
Compared with foreign countries, the toughness of BNbRE heavy rail HAZ coarse grain area is basically at the same level as that of hot-rolled rail flash welding.
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