针对400 MPa级HTS-A船用钢材料，开展拉伸力学性能试验、冲击韧性试验以及十字接头典型焊接节点在低温环境下的疲劳性能试验，得到-60℃低温环境下HTS-A钢十字接头的S-N曲线，综合比较低温与常温环境下HTS-A钢十字接头的疲劳性能，明确低温对疲劳性能的影响规律。结果表明，低温和常温环境下HTS-A钢材母材试样和十字接头试样疲劳寿命均高于规范C曲线和D曲线寿命，规范S-N曲线仍然适用于低温（-60℃）环境下的结构疲劳强度评估，但结果偏于保守，低温十字接头试样疲劳寿命分别为常温和D曲线的1.21倍和1.35倍。
The tensile mechanical properties test, impact toughness test, and fatigue performance test of typical welding joints of 400 MPa grade HTS-A marine steel cross joints were carried out in a low-temperature environment. The S-N curve of HTS-A steel cross joints at -60°C was obtained. By comprehensively comparing the fatigue performance of HTS-A steel cross joints at low and normal temperatures, the influence pattern of low temperature on fatigue performance was clarified. The results indicate that the fatigue life of both the base material and the cross joint samples of HTS-A steel in low and normal temperature environments is higher than the life specified by the C-curve and D-curve standards. This shows that the standard S-N curves are still applicable for evaluating the structural fatigue strength in low-temperature (-60°C) environments, although the results tend to be conservative. The fatigue life of low-temperature cross joint samples is 1.21 times that at normal temperature and 1.35 times that of the D-curve.
2025,47(16): 33-37 收稿日期：2024-8-13
DOI：10.3404/j.issn.1672-7649.2025.16.006
分类号：U661.43
基金项目：国家重点研发计划资助项目（2024YFE0104300）；国家自然科学基金资助项目（52001284，52192694）
作者简介：夏齐强(1984-),男,博士,高级工程师,研究方向为舰船工程
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