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Fe-20at%Cr alloy 1

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Taguchi method 1

Welding microstructure 1

chromium segregation 1

irradiation 1

laser hot wire cladding 1

process optimization 1

signal-to-noise (S/N) ratio 1

strength-toughen mechanism 1

ultra-high strength stainless steel 1

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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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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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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