Dissolution of laves phase by re-austenitization and tempering of creep strength enhanced ferritic steel. Issue 5 (23rd March 2020)

• Record Type: Journal Article
• Authors: Saini, Nitin; Mulik, Rahul S.; Mahapatra, Manas M.; Sharma, Nitin K.; Li, Leijun
• Is Part Of: Materials science and technology. Volume 36:Issue 5(2020)
• Page Start: 631
• Page End: 644
• Publication Date: 2020-03-23
• Subjects: P92 steel -- re-austenitization -- dissolution -- Laves phase -- M23C6; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2020.1724404
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: Formation of Laves phase in creep strength enhanced ferritic steel is investigated using re-austenitization and tempering treatment. The as-received material is exposed to 620°C for 4560 h aging, and then re-austenitizated at 1050°C for 1 h, and followed by tempering at 760°C for different times (2 and 4 h). After re-austenitization and tempering, the dissolution of Laves phase is observed while grain size and microhardness have not changed significantly. A model is suggested to quantify the dissolution of W-containing Laves phase. Thermo-Calc is used to predict driving forces for precipitation of Laves and M23C6 phases.