An approach to 570 °C/105h creep rupture strength prediction and safety assessment of Grade 91 components with reduced hardness after service exposures at 530–610 °C
| Autor: | Fangfang Peng, Chao Yang, Zhifang Peng, Sheng Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Mechanical Engineering 02 engineering and technology Stress (mechanics) 020303 mechanical engineering & transports 020901 industrial engineering & automation Brinell scale 0203 mechanical engineering Flexural strength Creep Mechanics of Materials Ultimate tensile strength Fracture (geology) Cylinder stress Yield ratio General Materials Science Composite material |
| Zdroj: | International Journal of Pressure Vessels and Piping. 182:104073 |
| ISSN: | 0308-0161 |
| DOI: | 10.1016/j.ijpvp.2020.104073 |
| Popis: | A function set is established to predict/extrapolate creep-rupture strengths of Grade 91 components with a Brinell hardness value between 145 and 205 after service exposures at 530–610 °C. The predicted 570 °C/105 h creep-rupture strengths have been much lowered than the relevant maximum allowable stress required for the as-manufactured/received Grade 91. In addition, a reversed change of yield ratio with hardness reduction indicates a critical change in safety of the service-exposed components after tensile tests at 550 and 600 °C. With the increasing of yield ratio after the reversed change with the reduction of hardness, the difference between the high temperature tensile strength values and the hoop stress values gradually becomes smaller until these values and the difference between them reach the lowest where the fracture/failure happens due to the acceleration of uneven plastic deformation. The proposed approach can be referenced to assess the component safety due to lack of relevant technical standard/method. |
| Databáze: | OpenAIRE |
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