Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

Impact Factor

2.10

CiteScore

Yi Long This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Bi-Cao Peng1,2, Liang Xiong1,2 and Jiao-Jiao Liu1,2

1State Grid Hunan Electric Power Research Institute, Changsha 410007, P.R. China
2Hunan Xiangdian Boiler & Pressure Vessel Inspection Center co., LTD, Changsha 410001, P.R. China


 

Received: June 1, 2017
Accepted: June 27, 2017
Publication Date: March 1, 2018

Download Citation: ||https://doi.org/10.6180/jase.201803_21(1).0012  

ABSTRACT


It is significant to study the properties of NF709R and HR3C during aging, which are the alternative materials for superheater and reheater in ultra-supercritical unit. After different predetermined aging period at 700 C, impact test of NF709R and HR3C were carried out at room temperature, and it was found that the impact toughness of NF709R was better than that of HR3C. Impact fracture surfaces and microstructure of both steels showed intergranular fracture characteristics and M23C6 precipitatedongrainboundaries.Itcanbeinferredthatthetransformation from ductile rupture to brittle after aging connected with the precipitation of M23C6. Applying of first-principles method to study the bond strength between the matrix and M23C6 in both steels found that the interface strength in NF709R was higher than that in HR3C. Through experiments and theoretical calculations, this paper explains the causes of different impact properties of NF709R and HR3C after aging, and proposes a reasonable way to increase the bond strength in austenitic heat-resistant steel.


Keywords: NF709R, HR3C, Interface Strength, First-principles, M23C6


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2.1
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