Small punch tensile/fracture test data for P91 material at -100 °C and a displacement rate of .003 mm/s (repeat test)

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.

本数据集与一项旨在验证小冲杆试验（Small Punch, SP）对高温服役金属材料寿命预测适用性的论文相关。该技术缺乏标准化，且其数据与传统蠕变试验所得数据的相关性存疑，因此有必要利用新近发布的《小冲杆试验实践规范》（CEN/WS 21）。本研究专门针对600摄氏度下P91钢焊接件的蠕变行为及低温断裂行为展开探究。研究人员从含P91焊接接头的构件不同区域制备了直径8毫米、厚度0.5毫米的薄圆盘试样，包括母材（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（fine-grain heat affected zone, FG-HAZ）及粗晶热影响区（coarse-grain heat affected zone, CG-HAZ）。严格遵循上述实践规范，在600摄氏度、不同载荷条件下对这些圆盘试样开展的SP蠕变试验结果，可与单轴蠕变数据建立关联。研究表明，SP试验是表征该合金及其焊接件蠕变行为的可靠方法；此外，通过有限元分析（Finite Element Analysis, FEA）可验证所推导的、适用于寿命预测的蠕变模型，以预测SP圆盘试样的蠕变变形。此外，SP试验方法在评估P91焊接件断裂性能方面展现出潜力，尤其适用于韧脆转变温度及断裂韧性的估算。