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首页> 外文期刊>International Journal of Fatigue >High temperature low cycle fatigue properties of 316(N) weld metal and 316L(N)/316(N) weld joints
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High temperature low cycle fatigue properties of 316(N) weld metal and 316L(N)/316(N) weld joints

机译：316（N）焊接金属和316L（N）/ 316（N）焊接接头的高温低周疲劳性能

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摘要

In the present paper, cyclic stress evolution and fracture behavior of 316(N) weld metal and 316L(N)/316(N) weld joints are reported under strain controlled low cycle fatigue tests. Axial total-strain controlled tests have been conducted at temperatures 773, 823 and 873 K with strain amplitudes of ±0.4, ±0.6 and ±1.0%. Though weld metals have shown higher plastic strain accumulation, observed fatigue life is better than the weld joints. Microstructural heterogeneity across the weld joint has resulted in poor fatigue life with most of the failures being initiated in heat affected zone, particularly at low to medium strain amplitudes. Few failures have been observed in weld metal zone of weld joint at high strain amplitudes. Differences in elastic modulus of weld metal and base metal creates strain incompatibility between the respective zones in the weld joint. As a first approximation to this strain incompatibility, plastic strain contribution from the weld metal and base metal zones of the weld joint are calculated by the rule of mixtures under equi-stress conditions and it is observed that base metal zone contributes to most of the plastic strain in weld joint.
机译：在本文中，报告了在应变控制的低周疲劳试验下，316（N）焊接金属和316L（N）/ 316（N）焊接接头的循环应力演变和断裂行为。轴向总应变控制测试已在温度773、823和873 K下进行，应变幅度为±0.4％，±0.6％和±1.0％。尽管焊缝金属表现出更高的塑性应变累积，但是观察到的疲劳寿命比焊缝更长。整个焊接接头的微观结构异质性导致了较差的疲劳寿命，其中大多数故障是在热影响区引发的，特别是在中低应变幅度下。在高应变幅度下，在焊接接头的焊接金属区域几乎没有观察到破坏。焊接金属和母材的弹性模量不同会在焊接接头的各个区域之间产生应变不兼容。作为这种应变不相容性的第一近似值，通过在等应力条件下的混合规则，计算了焊接接头的焊缝金属和母材区域的塑性应变贡献，并且观察到母材区域对大多数塑性有贡献焊接接头应变。

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