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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

Abstract:

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    

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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

Abstract: anisotropy of the microstructure with elongated grains in the hot-extrusion direction for the 18%Cr-ODS steels

Keywords： oxide dispersion strengthened (ODS) steel     milling     extrusion     aluminum     yttria    

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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

Abstract: The effects of irradiation on chromium performance under different temperatures in Fe-20at%Cr were modeled by modified Marlowe code. Chromium precipitation was observed in FeCr alloy after irradiation; interstitial Chromium atoms are the preferred formation of mixed Fe-Cr dumbbells in the direction of<110>and<111>; interstitial chromium atoms congregated on {111} and {110} plane. The results are compared with experiment observations and are useful to understanding the irradiation performances of FeCr alloy.

Keywords： irradiation     Fe-20at%Cr alloy     chromium segregation    

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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

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3,   Pages 242-249 doi: 10.1007/s11465-016-0397-7

Abstract: Laser deposition experiments with FV520B, one of martensitic stainless steels, were designed by using

Keywords： process optimization     Taguchi method     signal-to-noise (S/N) ratio     volumetric defect ratio     laser hot wire cladding    

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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

Abstract: To study the characteristics of metal magnetic memory (MMM) signals of different steels during tensile

Keywords： metal magnetic memory (MMM)     magnetic intensity (Hp)     static tension     weld    

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Micro-alloyed Steels 一 Review and Prospect

Wang Yikang

Strategic Study of CAE 2000, Volume 2, Issue 2,   Pages 77-82

Abstract: with superior property as “high tech” steels.Micro-alloyed steel is one of the major high tech steels with largest market demand.Micro-alloyed steels are produced by the Advanced Metallurgical Manufacturing Process with addition ofof high tough line-pipe steels, high strength ship steels and high tough SUF steel plate, the micro-alloyedsteels are prospective in China in the 21 century.

Keywords： micro-alloy steel     controlled rolling     line-pipe steel     weathering steel     SUF steel     environment conscious material    

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Development and application of manufacturing technology for high-performance and cost-saving stainless steels

Xie Shengtao,Liu Zhenyu and Wang Guodong

Strategic Study of CAE 2014, Volume 16, Issue 1,   Pages 81-87

Abstract:

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    

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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

Abstract:

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    

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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

Abstract:

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    

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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

Abstract:

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    

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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

Micro-alloyed Steels 一 Review and Prospect

Wang Yikang

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

Studying the New Strength-toughen Mechanisms,Developing a New Field of Ultra-high Steel

Zhao Zhenye,Li Zhi,Liu Tianqi,Zhu Jieyuan

Journal Article