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针对0Cr18Ni24Mo6N奥氏体焊缝金属开展了系列应变幅的循环加载试验,并分析了循环应力应变特性。结果表明:循环塑性变形条件下表观弹性模量随应变幅的增大呈线性降低特点;循环塑性应变显著降低屈服强度,且屈服强度随应变幅的增大呈线性降低特点;塑性变形段的真应力和真应变塑性分量满足单对数强化弹塑性本构关系,并建立了0Cr18Ni24Mo6N奥氏体焊缝金属循环应力应变本构方程。
For the 0Cr18Ni24Mo6N austenitic weld metal, a series of cyclic strain loading tests were carried out, and the cyclic strain characteristics were analyzed. The results show that under cyclic plastic deformation, the apparent elastic modulus decreases linearly with the increase of strain amplitude. The cyclic plastic strain decreases the yield strength remarkably and the yield strength decreases linearly with the increase of strain amplitude. The true stress and the true strain plastic component satisfy the single logarithmic elastic-plastic constitutive relationship, and the constitutive equation of 0Cr18Ni24Mo6N austenite weld metal cyclic stress and strain is established.