Fracture failure analysis on ultra supercritical turbine bolts

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Li, Nan^1 ; Li, Lingxia^1 ; Zhang, Xiaodan^1 ; Luo, Zhiqiang^1

Central Laboratory, Central Iron and Steel Research Institute, Beijing, China^1

关键词: Assembling process;    Chemical composition analysis;    Fracture analysis;    Fracture failure;    Fracture morphology;    High temperature stress ruptures;    Intergranular cracking;    Metallographic examination;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022002/pdf
DOI  :  10.1088/1757-899X/490/2/022002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Fracture failure analysis on ultra supercritical turbine bolts was carried out by means of chemical composition analysis, mechenical properties testing, metallographic examination and fracture analysis. The results show that the main reason of the bolts fracture is high temperature stress-rupture, with the fracture morphology being intergranular cracking character. The main fracture is perpendicular to the axial direction of bolt, which indicates that the tensile working stress result in the crack. In addition, another kind of cracks which is 45 of the axis has been found on the bolt. It indicates that there must be some abnormal torsion stress on the bolt which most possibly be caused during assembling process.