Effect of prior deformation on microstructural development and Laves phase precipitation in high‐chromium stainless steel

Hsiao, Z.W.; Chen, D.; Kuo, Jui‐Chao; Lin, Dabin

doi:10.1111/jmi.12516

Cited by 12 publications

(4 citation statements)

References 33 publications

(49 reference statements)

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“…5(c). Similar results highlighting local plastic deformation with regard to the analysis of IPF data were shown by Hsiao et al (Ref 34,35) and Schayes et al (Ref 23). Furthermore, the average KAM value for the deep rolled condition increased to 0.91°as detailed in Fig.…”

Section: Discussionsupporting

confidence: 86%

On the Influence of Surface Hardening Treatments on Microstructure Evolution and Residual Stress in Microalloyed Medium Carbon Steel

Fischer

Scholtes

Niendorf

2020

J. of Materi Eng and Perform

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Tailoring surface properties is a key to superior performance of components subjected to fatigue loadings in application. Process-microstructure-property relationships have to be established to allow for optimization of techniques employed for surface treatments such as deep rolling and induction hardening. Although both techniques are employed widely in industrial application, studies examining microstructure evolution and residual stress states for a single material in a comparative manner are missing. Amongst others, this is related to the labor-intensive characterization techniques to be employed for this purpose. In order to establish pathways toward more efficient characterization approaches, the present work evaluates relations between microstructure evolution, hardness and results obtained by x-ray diffraction for a medium carbon steel treated by established surface hardening techniques. In this context, a strong correlation between hardness values and integral width distributions obtained by x-ray diffraction can be seen, while only weak correlations between hardness and residual stress measurements are existing. For in-depth microstructure analysis, high-resolution electron optical microscopy has proven to be very effective in resolving microstructural features down to the nanoscale substantiating elementary relationships. The study focuses on highly stressed fillet regions of real components, i.e., crankshaft sections. A 44MnSiVS6 microalloyed steel grade was used for measurements, representing a current standard for the crankshaft production in the automotive sector.

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Section: Discussionsupporting

confidence: 86%

On the Influence of Surface Hardening Treatments on Microstructure Evolution and Residual Stress in Microalloyed Medium Carbon Steel

Fischer

Scholtes

Niendorf

2020

J. of Materi Eng and Perform

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“…One of the alloys originally developed for the application in SOFCs is so-called Crofer 22 H, which is a commercially available 22Cr ferritic steel containing some (Nb,W)(Fe,Cr) 2 Laves phase, see, for example, [759,762,763,772,773]. Due to its promising high-temperature mechanical properties, the idea came up to modify and optimize this Laves phase forming, fully ferritic steel for structural applications at 600 to 650°C in power plants [774][775][776][777].…”

Section: Ferritic 15-22% Cr Steelsmentioning

confidence: 99%

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

2020

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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“…Liang et al [8,12] created a large number of LAGBs in Fe-13Cr-5Al-2Mo-1Nb alloy through warm-rolling and studied the effect of annealing time. Hsiao et al [52] also observed the LAGBs in high-chromium stainless steel and found that the amount of LAGBs increased with the increase in deformation. Liu et al [9] found that the amount of LAGBs in the FeCrAl alloy decreased with the increase in deformation at 1100 °C because of the occurrence of DRX.…”

Section: Grain Boundary Featurementioning

confidence: 97%

Dynamic Precipitation of Laves Phase and Grain Boundary Features in Warm Deformed FeCrAl Alloy: Effect of Zr

Liu

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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Warm compression deformation of Fe-13.5%Cr-4.7%Al-2.0%Mo-0.70%Nb-0.40Ta (wt%) (FeCrAl) and Fe-13.5%Cr-4.7%Al-2.0%Mo-0.45%Nb-0.40Ta-0.11Zr (wt%) (FeCrAl-Zr) ferritic stainless steel was performed by a thermal simulation machine Gleeble 3800 at 600 °C and strain rates of 0.01-10 s −1 . Before deformation, all the samples were solution-annealed for 2 h at 1150 °C for FeCrAl alloy and 1250 °C for FeCrAl-Zr alloy. The strain rate has little or no effect on peak stress, and the precipitates in matrix or grain boundary precipitates (GBPs) have no difference in the samples deformed at the strain rate 0.01 s −1 and 1 s −1 both in FeCrAl and FeCrAl-Zr alloys. The addition of Zr increased the proportion of low-angle grain boundaries (LAGBs). The Laves phase in FeCrAl alloy precipitated uniform in the matrix, while in FeCrAl-Zr alloy Laves phase precipitated at grain boundary and formed GBP. The LAGBs and Σ3 coincident site lattice (CSL) grain boundary both increased in FeCrAl-Zr alloy, which possessed some beneficial properties such as high-temperature creep resistance to the Fe-Cr-Al alloy. More interesting, twins were created by warm deformation, which was difficult in typical bcc ferrite alloy. These results could be expected to provide guidance for subsequent warm working processes for the alloy.

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Effect of prior deformation on microstructural development and Laves phase precipitation in high‐chromium stainless steel

Cited by 12 publications

References 33 publications

On the Influence of Surface Hardening Treatments on Microstructure Evolution and Residual Stress in Microalloyed Medium Carbon Steel

On the Influence of Surface Hardening Treatments on Microstructure Evolution and Residual Stress in Microalloyed Medium Carbon Steel

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Dynamic Precipitation of Laves Phase and Grain Boundary Features in Warm Deformed FeCrAl Alloy: Effect of Zr

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