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本文首次提出了该焊缝的拘束与韧性之间的关系问题。为此作者设计了三种不同拘束状态的实际焊接接头,即全拘束(Ⅰ)、半拘束(Ⅱ)及无拘束(Ⅲ).对用OOCr13Ni6MOTi焊丝和TIG(或MIG)完成的多层焊缝进行了研究。在该条件下,当焊缝由高温冷却时,在γ→α相变之前的奥氏体温度区,不可避免地存在着一定的拘束应变,该应变协助马氏体相变,导致在形态上马氏体单元体和板条宽度都减小,从而在力学性能方面大大提高了焊缝的冲击韧性。实验结果证明,该韧性随着拘束应变的增加而增大,例如拘束状态Ⅰ的冲击韧性比拘束状态Ⅲ的提高了40％。
This paper presents for the first time the problem of the relationship between restraint and toughness of the weld. For this reason, the author has designed three kinds of actual welded joints in different restraint states, namely Full restraint (Ⅰ), Semi-restraint (Ⅱ) and Unrestrained (Ⅲ) .For the multi-layer weld with OOCr13Ni6MOTi welding wire and TIG Were studied. Under this condition, when the weld is cooled at a high temperature, there is inevitably a certain restraining strain in the austenite temperature zone prior to the γ → α transformation, which assists the martensitic transformation and leads to the formation of a The martensite body and the strip width are reduced, thus greatly improving the impact toughness of the weld in terms of mechanical properties. The experimental results show that the toughness increases with the restraint strain, for example, the impact toughness of the restrained state I is 40% higher than that of the restrained state III.