Small punch tensile/fracture test data for P91 material at -192 °C and a displacement rate of .003 mm/s (second 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.

本数据集关联一项旨在验证小冲杆（Small Punch, SP）试验适配高温服役金属材料寿命预测能力的研究论文。当前该技术尚未形成标准化体系，且其试验数据与常规蠕变试验所得数据的关联性尚存疑，这凸显了推广新近发布的《小冲杆试验实施规程》（CEN/WS 21）的必要性。本研究聚焦于探究P91钢焊接接头在600℃下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8 mm、厚度0.5 mm的薄圆盘试样，涵盖母材（Base Metal, BM）、服役后材料（Service-Exposed, SE）、焊缝金属（Weld Metal, WM）、细晶热影响区（Fine-Grain Heat Affected Zone, FG-HAZ）与粗晶热影响区（Coarse-Grain Heat Affected Zone, CG-HAZ）。按照该实施规程的要求，在600℃下采用不同载荷对上述圆盘试样开展小冲杆蠕变试验，所得结果可与单轴蠕变试验数据建立有效关联。研究证实，小冲杆试验可可靠表征该合金及其焊接接头的蠕变行为；针对该体系推导得到的适用于寿命预测的蠕变模型，其对小冲杆圆盘试样蠕变变形的预测能力，亦可通过有限元分析（Finite Element Analysis, FEA）得到验证。此外，小冲杆试验方法还展现出评估P91钢焊接接头断裂性能的潜力，尤其可用于韧脆转变温度与断裂韧性的估算。