학술논문
Microstructure Characterization and Charpy Toughness of P91 Weldment for As-Welded, Post-Weld Heat Treatment and Normalizing & Tempering Heat Treatment
Document Type
Article
Author
Source
Metals and Materials International, 23(5), pp.900-914 Sep, 2017
Subject
Language
English
ISSN
2005-4149
1598-9623
1598-9623
Abstract
The effect of weld groove design and heat treatment on microstructure evolution and Charpy toughness of P91pipe weldments was studied. The P91 pipe weldments were subjected to subcritical post weld heat treatment(760 °C-2 h) and normalizing/tempering conditions (normalized-1040 °C/40 min, air cooled; tempered 760 °C/2 h,air cooled) were employed. The influence of subsequent PWHT and N&T treatment on the microstructure of variouszone of P91 pipe weldments were also investigated. The present investigation also described the effect ofPWHT and N&T treatment on hardness, grain size, precipitate size, inter-particle spacing and fraction area of precipitatespresent in each zone of P91 pipe weldments. The result indicated great impact of heat treatment on theCharpy toughness and microstructure evolution of P91 weldments. The N&T treatment was found to be moreeffective heat treatment compared to subsequent PWHT. Charpy toughness value was found to be higher for narrow-groove design as compared to conventional V-groove design.