Uniaxial creep test data for P91 wm material at 600 °C and a stress of 179 MPa

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.

本数据集关联一项旨在验证小冲杆（Small Punch, SP）试验对于高温服役金属材料寿命预测适用性的研究论文。该技术尚未实现标准化，且其测试数据与常规蠕变试验所得数据的相关性尚存疑问，这凸显了采用新近发布的《小冲杆试验实施规程（CEN/WS 21）》的必要性。本研究专门针对600℃工况下P91钢焊接接头的蠕变行为，以及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8mm、厚度0.5mm的薄圆盘试样，涉及区域包括：母材（Base Metal, BM）、服役后材料（Service-Exposed Material, SE）、焊缝金属（Weld Metal, WM）、细晶热影响区与粗晶热影响区（FG-HAZ & CG-HAZ）。严格遵循《小冲杆试验实施规程》，在600℃、不同载荷条件下完成的上述试样SP蠕变试验结果，可与单轴蠕变试验数据建立关联。研究表明，SP试验可可靠表征该合金及其焊接接头的蠕变行为；此外，通过有限元分析（Finite Element Analysis, FEA）验证了所推导的适用于寿命预测的蠕变模型，该模型可用于预测SP试样的蠕变变形。此外，SP试验方法在评估P91钢焊接接头断裂性能方面展现出应用潜力，尤其可用于延脆转变温度及断裂韧性的估算。