Uniaxial creep test data for P91 material at 600 °C and a stress of 155 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.

本数据集源自一项旨在验证小冲杆（Small Punch, SP）试验用于高温服役金属材料寿命预测可行性的学位论文研究。该技术尚未形成标准化规范，且其试验数据与常规蠕变试验所得数据的相关性尚存疑虑，因此亟需采用新近发布的《小冲杆试验实施规程》（Code of Practice for Small Punch Testing, CEN/WS 21）。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。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，涵盖母材（Base Metal, BM）、服役后材料（Service-exposed Material, SE）、焊缝金属（Weld Metal, WM）以及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与CG-HAZ）。严格遵循该实施规程，在600℃、不同载荷条件下完成上述试样的SP蠕变试验，其结果可与单轴蠕变试验数据建立关联。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）可验证所推导的寿命预测用蠕变模型，以实现SP试样的蠕变变形预测。此外，SP试验方法还具备评估P91钢焊接件断裂性能的潜力，尤其可用于估算韧脆转变温度与断裂韧性。