不同组配P91钢焊接接头断裂性能的试验研究

采用JR阻力曲线试验方法，研究了强度组配对P91钢焊接接头不同区域断裂性能的影响规律，并分析了不同组配P91钢焊接接头的硬度分布。结果表明，焊接热循环对其热影响区的性能没有明显的影响；低组配焊接接头焊缝区的断裂阻力要高于高组配焊接接头焊缝区的断裂阻力，即强度低组配有利于提高P91钢焊缝的抗断性能；对于熔合线区域，试验结果体现出类似的规律，即随组配比的降低，熔合线区域的抗断性能升高；而无论何种强度组配的P91钢焊接接头。其焊缝金属的抗断性能均优于熔合线区域。

Study on Fracture Properties of P91 Steel Mis-matching Welded Joints

The influence of the strength mis-matching on the fracture properties of the different regions in P91 steel weldments was studied by the JR resistance curve method.And the hardness distribution along strength mis-matching P91 steel weldments was analyzed.The results show that the welding thermal-cycle on its mechanical property of the HAZ has no evidence effect.The fracture resistance of the welded joints of the low-matched P91 steel weldment is higher than that of high-matched weldment,that is,the lower strength matching-ratio(the weld metal strength to the base metal strength) is favorable to improve the fracture properties of the weld metal.For the fusion line,the experimental results are the similar rule to that of the weld metal,namely,the fracture resistance of fusion line increases with the decreasing of the strength matching ratio.In general,the fracture properties of the weld metal are superior to that of the fusion line for all kinds of P91 welded joints with different strength matching ratio.