Small punch creep test data for P91 haz_fg material at 600 °C and a load of 250 N (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证明小冲杆（Small Punch，SP）测试适用于高温服役金属材料寿命预测的论文相关。由于该技术缺乏标准化，且其测试数据与传统蠕变试验数据的相关性存疑，因此有必要利用最新发布的《小冲杆测试操作规范》（Code of Practice for Small Punch Testing，CEN/WS 21）。本研究具体聚焦于P91钢焊件在600摄氏度下的蠕变行为及低温断裂行为的探究。研究人员从含P91焊接接头的构件不同区域制备了直径8mm、厚度0.5mm的薄圆盘试样，涉及区域包括母材（base metal，BM）、服役暴露材料（service-exposed material，SE）、焊缝金属（weld metal，WM）、细晶热影响区与粗晶热影响区（fine-grain heat affected zone & coarse-grain heat affected zone，FG-HAZ & CG-HAZ）。遵循上述操作规范，在600摄氏度下对这些圆盘试样施加不同载荷进行SP蠕变测试，其结果可与单轴蠕变数据建立关联。研究表明，SP测试是表征该合金及其焊件蠕变行为的可靠方法；此外，通过推导得到的用于寿命预测的蠕变模型，还可借助有限元分析（Finite Element Analysis，FEA）预测SP圆盘试样的蠕变变形。另外，SP测试方法在评估P91焊件断裂性能方面具有潜力，尤其适用于韧脆转变温度与断裂韧性的估算。