High-precision method and apparatus for evaluating creep damage
US6935552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2002 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Sep 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N17/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high-precision method for evaluating creep damage of high tension heat resistant steel used in high temperature exposed apparatuses involves comparing particle size behavior varying with creep damage progress of crystal grains having a crystal orientation difference of about 2 degrees or more, preferably 3 degrees or more at an evaluated part on the basis of a working curve or a working map prepared in advance by looking for the relation of grain sizes to creep damage extent. A high-precision apparatus evaluates the creep damage of high tension heat resistant steel used in high temperature exposed apparatuses. A measuring device measures particle size variation behavior of crystal grains or sub grains having a crystal orientation difference of about 2 degrees or more with regard to a specimen at the evaluated part of high tension heat resistant steel and a working curve or a working map prepared in advance by looking for the relation of the grain sizes with respect to the creep damage extent (including creep damage rates) at every level of loaded stress. The creep damage extent is evaluated by comparing the grain size variation behavior measured by the measuring device with a wor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.