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An Investigation of Creep Resistance in Grade 91 Steel through Computational Thermodynamics

Engineering 2020年第6期6卷 644-652页

作者： Andrew Smith Mohammad Asadikiya Mei Yang Jiuhua Chen Yu Zhong Department of Mechanical and Materials Engineering Florida International UniversityMiamiFL 33174USA Mechanical Engineering Department Worcester Polytechnic InstituteWorcesterMA 01609USA

This study was conducted to understand the relationship between various critical temperatures and the stability of the secondary phases inside the heat-affected-zone(HAZ)of welded Grade 91(Gr.91)steel *** IV cracking has been observed in the HAZ,and it is widely accepted that the stabilities of the secondary phases in Gr.91 steel are critical to the creep resistance,which is related to the crack failure of this *** this work,the stabilities of the secondary phases,including those of the M23C6,MX,and Z phases,were simulated by computational *** cooling and Scheil simulations were carried out in order to understand the phase stability in welded Gr.91 *** effect of four critical temperatures—that is,Acl(the threshold temperature at which austenite begins to form),Ac3(the threshold temperature at which ferrite is fully transformed into austenite),and the M23C6 and Z phase threshold temperatures—on the thickness of the HAZ and phase stability in the HAZ is ***,the simulations presented in this paper explain the mechanisms that can affect the creep resistance of Gr.91 steel,and can offer a possible solution to the problem of how to increase creep resistance at elevated temperatures by optimizing the steel composition,welding,and heat treatment process *** simulation results from this work provide guidance for future alloy development to improve creep resistance in order to prevent type IV cracking.

关键词： Grade 91 steel Creep resistance ferritic-martensitic steels Welding microstructure Computational thermodynamics Secondary phase Alloy composition

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