Prediction of Residual Life of In-Service P91 Steel Joints Based on Fracture Behavior

Author:

Yan Kai1,Cai Yongjiang2,Wang Denghui3ORCID,Zhang Shichao3ORCID,Yi Shuang3ORCID,Yang Fulai3,Zhang Zheng3

Affiliation:

1. China Special Equipment Inspection & Research Institute, Beijing 100029, China

2. Guangdong Honghaiwan Power Generation Co., Ltd., Shanwei 516623, China

3. School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Abstract

P91 steel and P91 steel joints experience performance degradation after serving for 30,000 h in working conditions. To clarify the damage and failure behavior and remaining life of the joints during subsequent service, further creep testing was conducted on the welded joints of P91 steel that had been in service for 30,000 h at three temperatures: 550 °C, 575 °C, and 600 °C. The fracture surface and the cross-section damage behavior were characterized by SEM and EBSD methods. The results show that there are two types of fracture modes in the joints at different temperatures: ductile cracking occurring at the BM, and type IV cracking occurring in the FGHAZ. The threshold stress for fracture mode transition decreases with an increase in working temperature. Type IV cracking near the HAZ is the main reason for the premature failure of joints during service. And based on the fracture mode, the dual-constant L-M method was proposed to predict the strength of in-service joint materials. The testing data are discussed and classified based on the fracture mode in this method, which has high accuracy and can prevent the premature failure of joints.

Funder

Guangdong Honghaiwan Power Generation Co

China Special Equipment Inspection & Research Institute

Publisher

MDPI AG

Reference18 articles.

1. ASME (2013). Boiler and Pressure Vessel Code. Section II. Part A. Ferrous Material Specifications, American Society of Mechanical Engineers (ASME).

2. Characterization of geometrically necessary dislocation evolution during creep of P91 steel using electron backscatter diffraction;Zhang;Mater. Charact.,2023

3. Some studies on P91 steel and their weldments;Pandey;J. Alloys Compd. Interdiscip. J. Mater. Sci. Solid State Chem. Phys.,2018

4. Study of the creep cavitation behavior of P91 steel under different stress states and its effect on high-temperature creep properties;Han;J. Mater. Res. Technol.,2022

5. Insight into Type IV cracking in Grade 91 steel weldments;Wang;Mater. Des.,2020

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3