Small punch creep test data for P91 material at 600 °C and a load of 217 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.

本数据集对应一篇学位论文，该论文旨在论证小冲杆（Small Punch, SP）试验用于高温服役金属材料寿命预测的适用性。由于该技术尚未实现标准化，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，因此亟需采用最新发布的《小冲杆试验实施规程》（CEN/WS 21）开展相关研究。本研究重点探究了600℃工况下P91钢焊接件的蠕变行为，以及其低温断裂行为。研究人员从含P91焊接接头的构件的不同区域制备了直径8mm、厚度0.5mm的薄圆盘试样，分别取自母材（Base Metal, BM）、服役暴露材料（Service-Exposed Material, SE）、焊缝金属（Weld Metal, WM）、细晶热影响区与粗晶热影响区（Fine-Grain Heat Affected Zone & Coarse-Grain Heat Affected Zone, FG-HAZ & CG-HAZ）。按照该实施规程的规范要求，在600℃、不同载荷条件下对上述圆盘试样开展SP蠕变试验，所得试验结果可与单轴蠕变数据建立良好关联。研究证实，SP试验可可靠地表征该合金及其焊接件的蠕变行为；针对该体系推导的蠕变模型可用于寿命预测，且通过有限元分析（Finite Element Analysis, FEA）验证，该模型可有效预测SP圆盘的蠕变变形。此外，SP试验方法还具备评估P91钢焊接件断裂性能的潜力，可用于韧脆转变温度与断裂韧性的估算。