Influence of long-term service on microstructure, mechanical properties, and service life of HCM12A steel. (2nd January 2016)

• Record Type: Journal Article
• Authors: Zieliński, A.; Golański, G.; Sroka, M.; Tański, T.
• Is Part Of: Materials at high temperatures. Volume 33:Number 1(2016)
• Page Start: 24
• Page End: 32
• Publication Date: 2016-01-02
• Subjects: HCM12A steel -- Creep -- Microstructure -- Mechanical properties -- Residual life; Materials at high temperatures -- Periodicals; High temperatures -- Periodicals; 620.1121705
• DOI: 10.1179/1878641315Y.0000000015
• Languages: English
• ISSNs: 0960-3409

Abstract

Abstract : The investigated material was a pipe measuring φ38 × 6.3, made of HCM12A steel used for coils of boiler superheaters at supercritical and ultra-supercritical parameters of steam. The article presents the results of research on mechanical properties and microstructure of the examined pipe material in the as-received condition and after 100 000 h of service at the temperature of 585°C. Creep tests were carried out for the material serviced for 100 000 h to determine the available residual life. The influence of changes on mechanical properties and microstructure degradation on the loss of creep resistance was assessed compared with the as-received condition. Performed research has shown that the examined steel after 100 000 h of service fulfills the requirements set for this steel in the as-received condition within the range of strength properties at room and elevated temperature. The insignificant loss of life is confirmed by the results of creep test.