Open AccessMicrostructure analysis of P91 heat resistant steel in service for 3 years
Author(s) -
Facai Ren,
Jinsha Xu,
Zhiqiu Tu,
Jun Si
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1885/5/052037
Subject(s) - microstructure , materials science , metallography , martensite , ultimate tensile strength , scanning electron microscope , metallurgy , grain boundary , fracture (geology) , supercritical fluid , tensile testing , composite material , chemistry , organic chemistry
P91 heat resistant steel is an important material for supercritical units. In this paper, a P91 heat resistant steel pipe which has been used for about 3 years is analyzed by means of hot tensile test, metallography and scanning electron microscope. The results show that the microstructure is martensite and a large number of Cr-rich precipitates are distributed at the grain boundary. There are pores and cracks in the fracture of high temperature tensile specimen.