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An Investigation of Creep Resistance in Grade 91 Steel through Computational Thermodynamics Article
Andrew Smith, Mohammad Asadikiya, Mei Yang, Jiuhua Chen, Yu Zhong
Engineering 2020, Volume 6, Issue 6, Pages 644-652 doi: 10.1016/j.eng.2019.12.004
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 parts. Type 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 steel. In this work, the stabilities of the secondary phases, including those of the M23C6, MX, and Z phases, were simulated by computational thermodynamics. Equilibrium cooling and Scheil simulations were carried out in order to understand the phase stability in welded Gr.91 steel. The effect of four critical temperatures—that is, Ac1 (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 discussed. Overall, 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 parameters. The simulation results from this work provide guidance for future alloy development to improve creep resistance in order to prevent type IV cracking.
Keywords: Grade 91 steel Creep resistance Ferritic-martensitic steels Welding microstructure Computational
Development of oxide dispersion strengthened ferritic steels with and without aluminum
Jae Hoon LEE
Frontiers in Energy 2012, Volume 6, Issue 1, Pages 29-34 doi: 10.1007/s11708-012-0178-x
Keywords: oxide dispersion strengthened (ODS) steel milling extrusion aluminum yttria
Effects of irradiation on chromium’s behavior in ferritic/martensitic FeCr alloy
Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN
Frontiers in Energy 2009, Volume 3, Issue 2, Pages 181-183 doi: 10.1007/s11708-009-0025-x
Keywords: irradiation Fe-20at%Cr alloy chromium segregation
Zilin HUANG,Gang WANG,Shaopeng WEI,Changhong LI,Yiming RONG
Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3, Pages 242-249 doi: 10.1007/s11465-016-0397-7
Keywords: process optimization Taguchi method signal-to-noise (S/N) ratio volumetric defect ratio laser hot wire cladding
Characteristics of metal magnetic memory signals of different steels under static tension
Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,
Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2, Pages 226-232 doi: 10.1007/s11465-010-0012-2
Keywords: metal magnetic memory (MMM) magnetic intensity (Hp) static tension weld
Micro-alloyed Steels 一 Review and Prospect
Wang Yikang
Strategic Study of CAE 2000, Volume 2, Issue 2, Pages 77-82
Keywords: micro-alloy steel controlled rolling line-pipe steel weathering steel SUF steel environment conscious material
Xie Shengtao,Liu Zhenyu and Wang Guodong
Strategic Study of CAE 2014, Volume 16, Issue 1, Pages 81-87
Quenching and partitioning(Q&P)treatment was applied to cold rolling sheets of 409L and 410S ferriticstainless steels,which resulted in a multiphase microstructure of ferrite, martensite and retained austenite
Keywords: stainless steel quenching partitioning high strength well formability
Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling
Fu Jie,Wu Huajie,Liu Yangchun
Strategic Study of CAE 2008, Volume 10, Issue 4, Pages 65-72
Based on the principle of the integrated strengthening of steel, the strengthening and the softening of HSLC steel have been studied by controlling the precipitation of carbon in steel around A1 temperature. The results show that strength of HSLC steel produced by TSCR can be further increased. By using temper-slow cooling, σs of HSLC steel(ZJ330) produced by TSCR can be decreased from 344 MPa to 225 MPa to meet the requirement of producing basal plate for cold rolling. Problems about ferrite rolling, ultra fine grain steel and a possible new type building materials have been discussed.
Keywords: HSLC steel strengthening softening basal plate for cold rolling super steel
Interphase precipitation in low carbon Ti-V microalloyed steels
Jia Tao,Wei Jiao,Feng Jie,Zhang Weina,Liu Zhenyu and Wang Guodong
Strategic Study of CAE 2014, Volume 16, Issue 1, Pages 88-92
The present study focuses on the Ti-V microalloying system which draws less attention. By using the Formaster-FII dilatometer,the sample was held at austenite/ferrite dual- phase temperature region and the Ti-V complex interphase precipitates were obtained during the austenite to ferrite transformation. Optical Microscopy (OM) and transmission electron microscopy (TEM) were employed to analyze the microstructure,especially the morphology of the interphase precipitate and its crystallographic orientation relationship with ferrite matrix. Studies show that 650 ℃ is the nose temperature for static isothermal transformation. The interphase precipitates exhibit sheet-like distribution,including flat and curved sheets and adopt Baker-Nutting orientation relationships with the ferrite matrix.
Keywords: Ti-V microalloyed steel interphase precipitation isothermal phase transformation TEM
Studying the New Strength-toughen Mechanisms,Developing a New Field of Ultra-high Steel
Zhao Zhenye,Li Zhi,Liu Tianqi,Zhu Jieyuan
Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 39-42
The new strength-toughen mechanisms, such as super fine Martensitic laths, new strength phases, Lavesphase and M2C carbide, precipitated coherence with Martensitic matrix and the VIM + VAR double
Keywords: ultra-high strength stainless steel Martensitic lath strength-toughen mechanism
Title Author Date Type Operation
An Investigation of Creep Resistance in Grade 91 Steel through Computational Thermodynamics
Andrew Smith, Mohammad Asadikiya, Mei Yang, Jiuhua Chen, Yu Zhong
Journal Article
Development of oxide dispersion strengthened ferritic steels with and without aluminum
Jae Hoon LEE
Journal Article
Effects of irradiation on chromium’s behavior in ferritic/martensitic FeCr alloy
Xinfu HE, Wen YANG, Zhehao QU, Sheng FAN
Journal Article
Process improvement in laser hot wire cladding for martensitic stainless steel based on the Taguchi method
Zilin HUANG,Gang WANG,Shaopeng WEI,Changhong LI,Yiming RONG
Journal Article
Characteristics of metal magnetic memory signals of different steels under static tension
Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,
Journal Article
Development and application of manufacturing technology for high-performance and cost-saving stainless steels
Xie Shengtao,Liu Zhenyu and Wang Guodong
Journal Article
Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling
Fu Jie,Wu Huajie,Liu Yangchun
Journal Article
Interphase precipitation in low carbon Ti-V microalloyed steels
Jia Tao,Wei Jiao,Feng Jie,Zhang Weina,Liu Zhenyu and Wang Guodong
Journal Article