Small punch tensile/fracture test data for P91 wm material at -158 °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.

本数据集源自一项旨在验证小冲杆（Small Punch）测试用于高温服役金属材料寿命预测适用性的学位研究。该技术缺乏统一行业标准，其测试数据与常规蠕变测试所得数据的相关性尚存争议，这凸显了采用新近发布的《小冲杆测试实施规程（CEN/WS 21）》的必要性。本研究聚焦于600℃工况下P91钢焊接件的蠕变行为与低温断裂行为。研究人员从含P91焊接接头的试件不同区域制备了直径8mm、厚度0.5mm的薄圆盘试样，涵盖母材（BM）、服役后材料（SE）、焊缝金属（WM）、细晶热影响区与粗晶热影响区（FG-HAZ & CG-HAZ）。严格遵循该实施规程，在600℃、不同载荷条件下开展的上述试样小冲杆蠕变测试结果，可与单轴蠕变测试数据建立关联。研究表明，小冲杆测试是表征该合金及其焊接件蠕变行为的可靠方法；此外，所推导的适用于寿命预测的蠕变模型，也可通过有限元分析（Finite Element Analysis, FEA）验证其对小冲杆试样蠕变变形的预测能力。此外，小冲杆测试方法还具备评估P91钢焊接件断裂性能的潜力，尤其可用于延脆转变温度与断裂韧性的估算。