New observations on the formation of athermal martensite in Fe–Ni–Mo alloys

Yasar, E.; Güngüneş, H.; Aktürk, Selçuk; Durlu, T. N.

doi:10.1016/j.jallcom.2006.03.051

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…It is quite obvious from figure 4(b) that the crystallographic orientation relationship between the austenite and thermally induced plate martensite crystals shows a typical (110) α //(111) γ , [111] α // [110] γ Kurdjumov-Sachs (K-S) type and the habit plane is determined as very close to [252] γ plane of the austenite. These crystallographic results of study display appropriate behaviours with respect to earlier reports (Yang and Wayman 1992;Yasar et al 2007). Moreover, figure 5 (a-b) shows a TEM micrograph of a martensite formation with twinning.…”

Section: Resultssupporting

confidence: 79%

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New observations on formation of thermally induced martensite in Fe–30%Ni–1%Pd alloy

Yıldız

Nezir

2013

Bull Mater Sci

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Kinetical, morphological, crystallographical and thermal characteristics of thermally induced martensite in an Fe-30%Ni-1%Pd alloy has been studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and X-ray diffraction method. Kinetics of transformation was found to be as athermal. SEM and TEM observations and X-ray method revealed α (bcc) martensite formation in the austenite phase of alloy by thermal effect. The crystallographic orientation relationship between austenite and α (bcc) martensite was found to be having Kurdjumov-Sachs (K-S) type relationship. In addition, the lattice parameters of austenite and martensite phases were calculated from X-ray diffraction patterns.

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Section: Resultssupporting

confidence: 79%

“…DSC results of previous and present studies. martensite crystal having internal twins to ε-martensite with increasing Mo content (Yasar et al 2007). The present study shows that, addition of Pd element to binary Fe-30%Ni alloy, the austenite matrix transforms to α -martensite.…”

Section: Resultssupporting

confidence: 48%

New observations on formation of thermally induced martensite in Fe–30%Ni–1%Pd alloy

Yıldız

Nezir

2013

Bull Mater Sci

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“…A small broadening effect occurred in the diffracted peaks of the modified surface due to an increase of grain boundaries from ultrafine size subgrain formations. In sample E15 and E8, one of the factors which caused grain refinement was the growth and evolution of martensite phase due to grain-subgrain boundaries and lattice structure changes under the specific variation in temperature [12,13]. The broadening effect investigated is also correlated with the mechanical properties of steel where ultrafine grain exhibits high strength and good ductility in metallic materials [14,15].…”

Section: Discussionmentioning

confidence: 99%

An investigation of phase transformation and crystallinity in laser surface modified H13 steel

2012

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This paper presents a laser surface modification process of AISI H13 tool steel using 0.09, 0.2 and 0.4 mm size of laser spot with an aim to increase hardness properties. A Rofin DC-015 diffusion-cooled CO 2 slab laser was used to process AISI H13 tool steel samples. Samples of 10 mm diameter were sectioned to 100 mm length in order to process a predefined circumferential area. The parameters selected for examination were laser peak power, overlap percentage and pulse repetition frequency (PRF). X-ray diffraction analysis (XRD) was conducted to measure crystallinity of the laser-modified surface. X-ray diffraction patterns of the samples were recorded using a Bruker D8 XRD system with CuK α (λ = 1.5405 Å) radiation. The diffraction patterns were recorded in the 2θ range of 20 to 80°. The hardness properties were tested at 981 mN force. The lasermodified surface exhibited reduced crystallinity compared to the un-processed samples. The presence of martensitic phase was detected in the samples processed using 0.4 mm spot size. Though there was reduced crystallinity, a high hardness was measured in the laser-modified surface. Hardness was increased more than 2.5 times compared to the as-received samples. These findings reveal the phase source of the hardening mechanism and grain composition in the lasermodified surface.

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Iron – Molybdenum – Nickel

Ivanchenko¹,

Pryadko

2008

Landolt-Börnstein - Group IV Physical Chemistry

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New observations on the formation of athermal martensite in Fe–Ni–Mo alloys

Cited by 8 publications

References 29 publications

New observations on formation of thermally induced martensite in Fe–30%Ni–1%Pd alloy

New observations on formation of thermally induced martensite in Fe–30%Ni–1%Pd alloy

An investigation of phase transformation and crystallinity in laser surface modified H13 steel

Iron – Molybdenum – Nickel

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