Maraging behavior in an Fe-19.5Ni-5Mn alloy I: Precipitation characteristics

Shiang, L.T.; Wayman, C.M.

doi:10.1016/0026-0800(88)90004-3

Cited by 27 publications

(16 citation statements)

References 18 publications

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“…When the alloy was aged for 48 hours (Figure 12 comparable to the observed values of Mn and Ni concentration in precipitates. Formation of coarse austenite at grain (b)), the austenite particles had grown to be ϳ100-nm size, boundaries or lathlike austenite on lath boundaries has been and average distance between the particles increased to reported in several other studies [5][6][7][8][9]25,26] after aging at and ϳ200 nm, compared with ϳ70 nm in the alloy aged for 30 above 500 ЊC (or at lower temperatures for a much longer minutes. Decohesion of the incoherent interface between the time).…”

Section: B Possible Source Of Grain Boundary Embrittlementmentioning

confidence: 82%

“…In addition, fine, fct -MnNi intermetallic particles, which were previously identified as a without any precipitate. The concentrations of Mn and Ni are ϳ2 to 3 wt pct, and no change in the amount of alloying hardening phase in Fe-Mn-Ni alloys, [5][6][7][8] were observed in the matrix. When the alloy was overaged for 48 hours, the secondelements at the boundary is detected.…”

Section: Measurement Of Alloy Concentration At Grain Concentration Prmentioning

confidence: 99%

“…However, the segregation level of Mn hardening behavior, [1][2][3][4] well comparable to that of the 18Ni is relatively low and, considering the reported embrittling maraging steels. The precipitation of fct -MnNi intermetaleffect of Mn, [17,18] such serious embrittlement of Fe-Mn-Ni lic particles [5][6][7][8] is believed to be the main source of hardenalloys is not very likely to be explained by the segregation ing, even though precipitation of other phases, such as bcc of Mn alone. ␤ -MnNi, [1] , fcc Ni 3 Mn, [1] and ordering [9] have also been In this study, in an attempt to clarify the source of embritsuggested.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel

Mun¹,

Watanabe

Williams

et al. 2002

Metall Mater Trans A

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Precipitation of austenite particles at grain and lath boundaries after aging treatment of a Fe-8Mn-7Ni alloy was investigated by selected area electron diffraction (SAD), X-ray energy dispersive spectrometry (EDS) in a scanning transmission electron microscope (STEM), and high-resolution (HRTEM) analysis. High spatial-resolution (2 to 5 nm) EDS analysis revealed no significant segregation of alloying elements at grain boundaries but the precipitation of very fine particles of Mn-and Nirich phase. Detailed EDS, SAD, and HRTEM analyses all confirmed that these particles are austenite phase, which have a Kurdjumov-Sachs (K-S) orientation relationship with one of the adjacent grain. The concentration of Mn and Ni in austenite, measured by EDS, varied from ϳ15 pct to a maximum of ϳ30 pct. Low-voltage scanning electron microscopy (SEM) fractographs also revealed the presence of very fine, second-phase precipitates on the fracture surface of the embrittled alloys.

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Section: B Possible Source Of Grain Boundary Embrittlementmentioning

confidence: 82%

Section: Measurement Of Alloy Concentration At Grain Concentration Prmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel

Mun¹,

Watanabe

Williams

et al. 2002

Metall Mater Trans A

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“…The characterisation of the precipitate and its effect on maraging behaviour have been investigated [15] [20][21] [22][23] [24]. However, this type of Fe-Mn-(Ni) alloy suffers from severe embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution of Mn-based maraging steels and their influences on mechanical properties

Qian

Sharp

Rainforth

2016

Materials Science and Engineering: A

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“…[1] Formation of body-centered cubic (bcc) b-NiMn zones has been suggested for early stages of aging. [2,3] However, facecentered cubic (fcc) Ni 3 Mn, [3] bcc NiMn, [4] and facecentered tetragonal (fct) h-NiMn [5][6][7][8][9][10][11] precipitates have been identified at later stages of aging. The Fe-Ni-Mn maraging steels suffer from premature intergranular fracture along prior austenite grain boundaries after aging.…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy Study on the Grain Boundary Precipitation of an Fe-Ni-Mn Maraging Steel

Nedjad

Nili‐Ahmadabadi

2007

Metall Mater Trans A

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Transmission electron microscopy was used to study grain boundary precipitation of an Fe-10Ni-7Mn (wt pct) maraging steel during isothermal aging at 753 K. Precipitation of a facecentered tetragonal (fct) h-NiMn phase in association with solute-depleted precipitate free zone (PFZ) was found at prior austenite grain boundaries. Precipitation-induced puckering of grain boundaries in the early stages of aging initiates grain boundary displacement, creating PFZs behind the displaced grain boundary. Further grain boundary migration is driven by the manganese and nickel concentration gradients across the migrating boundary and the elastic strain energy and interphase boundary energy of fine fct h-NiMn particles in the grain that is to be swept by the migrating boundary. Consequently, coarsening of the fct h-NiMn particles occurs via grain boundary diffusion as they are passed by the migrating boundary. As rationale, the reaction is defined as discontinuous coarsening of grain boundary precipitates, featuring a nodular morphology of discontinuous coarsening aggregate. Continuous precipitation within the grain facing reaction front decreases overall reaction driving force at later stages, which leads to a decelerated reaction rate.

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Maraging behavior in an Fe-19.5Ni-5Mn alloy I: Precipitation characteristics

Cited by 27 publications

References 18 publications

Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel

Precipitation of austenite particles at grain boundaries during aging of Fe-Mn-Ni steel

Microstructural evolution of Mn-based maraging steels and their influences on mechanical properties

Transmission Electron Microscopy Study on the Grain Boundary Precipitation of an Fe-Ni-Mn Maraging Steel

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