Small punch creep test data for P91 haz_fg material at 600 °C and a load of 250 N

The data relate to a thesis concerned with demonstrating the suitability of Small Punch (SP) testing for lifetime prediction of metallic materials operating at high temperatures. The lack of standardisation of this technique and doubts about the correlation of the data with that obtained from conventional creep tests, supports the need to exploit the recently launched Code of Practice for Small Punch Testing (CEN/WS 21). The present work is specifically concerned with investigating the creep behaviour of P91 steel weldments at 600 Celsius along with low-temperature fracture behaviour. Thin discs, 8 mm in diameter and 0.5 mm thick, were manufactured from different zones of a component containing a P91 welded joint: base metal (BM), service- exposed material (SE), weld metal (WM), fine-grain and coarse-grain heat affected zones (FG-HAZ & CG-HAZ). The results of SP creep tests on these disks, performed at 600 Celsius under different loads carefully following the Code of Practice, could be correlated with uniaxial creep data. The SP test is shown to be a reliable method to depict creep behaviour of this alloy and its weldments and a creep model derived, useful for life time prediction, could also be demonstrated through FEA to predict the creep deformation of the SP discs. Additionally, the SP testing method shows potential to evaluate the fracture properties of P91 weldments, in particular the ductile-to-brittle transition temperature and fracture toughness estimations.

本数据集涉及一项旨在验证小冲杆（Small Punch, SP）试验对高温服役金属材料寿命预测适用性的研究论文相关内容。该技术尚未形成标准化体系，且其试验数据与常规蠕变试验所得数据的相关性尚存争议，因此亟需依托最新发布的《小冲杆试验实施规程》（Code of Practice for Small Punch Testing, CEN/WS 21）开展相关研究。本研究专门针对P91钢焊接接头在600℃下的蠕变行为与低温断裂行为展开探究。从含P91焊接接头的构件不同区域制备了直径8 mm、厚度0.5 mm的薄圆盘试样，涵盖母材（Base Metal, BM）、服役后材料（Service-Exposed Material, SE）、焊缝金属（Weld Metal, WM）、细晶热影响区（Fine-Grain Heat Affected Zone, FG-HAZ）与粗晶热影响区（Coarse-Grain Heat Affected Zone, CG-HAZ）。严格遵循该实施规程的要求，在600℃、不同载荷条件下对上述圆盘试样开展SP蠕变试验后，所得结果可与单轴蠕变数据建立良好关联。研究证实，SP试验可可靠表征该合金及其焊接接头的蠕变行为；通过有限元分析（Finite Element Analysis, FEA）验证的衍生蠕变模型，亦能有效预测SP圆盘的蠕变变形，该模型可用于材料寿命预测。此外，SP试验方法在评估P91钢焊接接头的断裂性能方面展现出应用潜力，尤其适用于延脆转变温度（Ductile-to-Brittle Transition Temperature）与断裂韧性的估算。