高速铁道车辆焊接转向架材质性能分析与研究

Study and Analysis on Material Capability for High-speed Welding Bogies

对 16MnR、16Mnq、SM490C以及 14MnNbq研究表明 :在C、Si、Mn、P和S五元素当中 ,S含量对钢的冲击韧性影响较大。S含量在 0 0 0 5 %～ 0 0 2 0 %范围内 ,随着S含量的增加钢的冲击韧性成倍下降。在相同范围内 ,P对钢的冲击韧性的影响很小。 14MnNbq钢的强度与 16Mn相当 ,冲击韧性大大优于 16Mn。 14MnNbq钢的碳当量较低 ,焊接性良好 ,冲击韧性较为突出 ,Akv - 40℃≥ 10 0J。研制的TY J5 0 7Q焊条采用CaF2 CaCO3 SiO2 TiO2 渣系。焊缝金属的金相组织为细针状铁素体。焊条的熔敷金属水银法扩散氢检测结果为 1 99mL·10 0 g-1,冲击功Akv - 40℃≥ 47J。富氩焊焊丝ER5 0 3B的质量良好 ,焊接工艺稳定 ,强度与母材相当 ,冲击功Akv - 40℃≥ 47J。采用 14MnNbq及相关的焊接材料、工艺制造高速铁道车辆焊接转向架 。

Studies on 16MnR,16Mnq,SM490C and 14MnNbq show that in the five elements of C,Si,Mn,P and S the content of S has greater effect on the impact toughness of the steel.When the content of S is in the range of 0 005%—0 020%,the impact toughness of steel drops in multiple rate with the increasing of S content.While in the same range,P content has a very low effect on the impact tounghness.14MnNbq steel has low Ceq,good weldability,and excellent impact toughness.Impact work of 14MnNbq is AkV-40 ℃≥100 J.The diffusible hydrogen of deposited metal for TY J507Q electrode that has been developed is 1 99 mL·100 g -1 (with mercury method).Its impact work is AkV-40 ℃≥47 J.Mixed gas arc welding wire ER50 3B is good in wold quality,stable in welding technology,and similar in strength with base metal.Impact work of ER50 3B is AKV-40℃≥47J.Electrode TY J507Q adopts CaF 2 CaCO 3 SiO 2 TiO 2 slag system.Weld metal microstructure is fine acicular ferrite.When integrated bogie of high speed railway car is manufactured with 14MnNbq and correlative welding consumables and the technology,will improve the mechanical properties of the bogie holistic structure.