Determination of long-term creep rupture properties for 316H steel is both costly and time-consuming and given the level of scatter in the data would need substantial number of tests to be performed. The primary objective of this study is to estimate the long-term creep properties of cross-weld (XW) and as-received (AR) 316H stainless steel by performing accelerated tests on pre-compressed (PC) material. In this work, uniaxial creep rupture tests have been performed on XW specimens and the results have been used to establish a correlation with accelerated test results on the PC material. Moreover, tensile tests have been performed on XW specimens at room temperature and 550 °C to examine the pre-conditioning effects on the mechanical response of the material. Similar power-law creep properties have been found for the creep strain rate and rupture time behaviour of the XW and PC specimens. It also has been found that the creep ductility data points obtained from XW and PC specimens fall upon the estimated trend for the AR material at 550 °C when the data are correlated with the applied stress normalised by 0.2% proof stress. The results show that the long-term creep properties of the XW and AR material can be estimated in much shorter time scales simply by performing tests on the PC material state.

中文翻译：

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使用预应变材料的短期试验确定 316H 钢的长期蠕变性能

确定 316H 钢的长期蠕变断裂性能既昂贵又费时，并且考虑到数据的分散程度，需要进行大量的测试。本研究的主要目的是通过对预压缩 (PC) 材料进行加速测试来评估交叉焊缝 (XW) 和原样 (AR) 316H 不锈钢的长期蠕变性能。在这项工作中，对 XW 试样进行了单轴蠕变断裂试验，结果已用于建立与 PC 材料加速试验结果的相关性。此外，在室温和 550 °C 下对 XW 试样进行了拉伸试验，以检查预处理对材料机械响应的影响。对于 XW 和 PC 试样的蠕变应变速率和断裂时间行为，已发现类似的幂律蠕变特性。还发现从 XW 和 PC 试样获得的蠕变延展性数据点符合 AR 材料在 550 °C 时的估计趋势，当数据与通过 0.2% 屈服应力归一化的应用应力相关时。结果表明，只需对 PC 材料状态进行测试，就可以在更短的时间范围内估计 XW 和 AR 材料的长期蠕变特性。