不同强韧性组配的16Mn钢焊接接头的断裂性能和裂行为

对16Mn钢不同组配焊接接头的断裂性能和断裂行为进行了试验研究。认为在高应力塑性断裂和高应力脆性断裂状态下，16Mn钢接头的断裂强度为焊缝强度和接头各部分塑性变形能力所决定，提高焊缝强度以及提高焊缝和母材的塑性均有利于提高接头的抗断裂能力；在低应力脆性断裂状态下，接头的抗断裂性能是可以根据焊缝的低温冲击韧度进行评价的。焊接接头各部分塑性变形能力及其相互关系对焊接接头的断裂行为具有不可忽视的影响，是评价接头断裂性能的重要依据。

FRACTURE PROPERTIES AND FRACTURE BEHAVIORS OF DIFFERENT MATCHING STRENGTH AND TOUGHNESS OF 16Mn STEEL WELDED JOINTS

The fracture properties and behaviors of mathching strength and toughness of 16Mn welded joints are studied and analysed by means of the miniature deep notch test.The results show that under the conditions of high stress plastic fractures and high stress brittle fractures,the fracture strength of 16Mn steel welded joints is determined by the weld strength and joint plasticity and under the conditions of low stress brittle fractures,the resistance to joint fracture can be appraised onbasis of the low-temperture impacttoughness of weld metal.The plasticity of each part of the welded joints has an effec on fracture behaviors of joints and is one of the important foundations for appraising fracture of welded joints.