Microstructural changes produced by hot forging in a C300 Maraging Steel

Güiza, G.M. Castro; Oliveira, Carlos A. S.

doi:10.1016/j.msea.2015.12.084

Cited by 25 publications

(10 citation statements)

References 16 publications

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“…However, as the tendency of precipitation kinetics is to reduce with a reduction in supersaturation and nucleation site, the increase in Ni 3 (Ti, Mo) volumetric fraction was less significant between 10 and 50 h than 0 and 10 h. Increasing aging time also generates austenite in the HF condition, only. That was also verified by Guiza [7] and Freitas [44], which showed that hot forging accelerates the austenite formation.…”

Section: Discussionsupporting

confidence: 53%

“…Maraging steels, after solubilization at 1323 K for 1 h, have a fully martensitic matrix [7]. The diffractogram obtained in the non-aged WD condition showed the peaks (200) and (211) shifted to the right when compared to the α-iron BCC structure, as usually is observed in maraging steels [2,12,[26][27][28][29].…”

Section: Discussionmentioning

confidence: 66%

“…Precipitate and reverse austenite formation, as well as their effects on the properties of maraging steels during aging at temperatures above 723 K, with and without deformation, have been studied in recent years [1][2][3][4][5][6][7][8][9]. The growing interest in maraging steels is due to their ultra-high strength combined with good toughness.…”

Section: Introductionmentioning

confidence: 99%

“…In order to reach their final properties, maraging steels are, usually, solubilized between 1093 and 1373 K [10,[15][16][17][18][19][20] and then aged for intermetallic precipitation between 673 and 873 K [8,14,[21][22][23]. The mechanical strength of these steels can also be increased by cold and/or hot plastic deformation, which leads to a reduction in toughness and the increase in precipitation and reverse austenite formation kinetics [2,[7][8][9]. The effect of deformation on precipitation occurs due to the increased density of dislocation present in the material, accelerating atomic diffusion and, consequently, accelerating the formation of solute clusters and precipitation [8].…”

Section: Introductionmentioning

confidence: 99%

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Structural Study of Undeformed and Deformed Maraging C300 Steels Using X-ray Diffraction Measurements

Melo

Oliveira

Poffo

et al. 2020

Metallogr. Microstruct. Anal.

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A high Ti content maraging C300 steel was analyzed by X-ray diffraction measurements to study the effect of aging at 773 K for different treatment times by monitoring lattice parameter, microstrain, crystallite size and formation/dissolution of intermetallic Ni 3 (Ti, Mo). The results showed a strong influence of cold and hot deformation over precipitation of the coherent metastable orthorhombic phase Ni 3 (Ti, Mo). The volumetric fraction of this precipitation can go up to 14 and 19% in non-deformed and deformed samples, respectively. At longer aging time, this precipitate starts to dissolve to form a more stable μ phase and reverse austenite. Also, the results showed a strong influence of deformation and precipitation on crystallite size and microstrain.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural Study of Undeformed and Deformed Maraging C300 Steels Using X-ray Diffraction Measurements

Melo

Oliveira

Poffo

et al. 2020

Metallogr. Microstruct. Anal.

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“…Addition of Mn in Mg-Zn-Ca alloy will also cause grain refinement but the controlling mechanism related to constitutional undercooling [5]. Furthermore, there are other processes that can be effectively used to refine the final microstructure including increasing the rate of cooling or rapid quenching [6], severe plastic deformation [7], hot forging [8], etc. There are also many indirect factors that improve embedding of diamond in charging process such as rotational rate of ceramic ring which is used for driving diamond abrasives into lapping plate, rotational rate of lapping plate, as well as temperature during charging, etc.…”

Section: Introductionmentioning

confidence: 99%

Study of Microstructure and Mechanical Properties of Commercially Pure Sn and Sn-4%Bi Alloys Fabricated by Permanent Mold Gravity Casting and Forging

Thongchai

Lohwongwatana

Puncreobutr

et al. 2018

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The influences of 4 wt% bismuth addition and room temperature strain on microstructure and mechanical properties in tin alloys were investigated in this study. Commercially pure tin and Sn-4%Bi alloys were fabricated by permanent mold gravity casting. The samples were then subjected to forging process at room temperature. As-cast microstructures were compared with 0.25 and 0.5 strained samples. Differential Scanning Calorimetry (DSC) was used to confirm the effect of bismuth on undercooling. The recrystallization and grain growth processes were confirmed by grain size distribution and misorientation study using Electron Backscattered Diffraction (EBSD). Furthermore, position and morphology of the bismuth precipitates were investigated by using Field Emission Scanning Electron Microscope (FESEM). X-ray Photoelectron Spectroscopy (XPS) revealed that tin oxide was the main species found on the surface of these alloys. There was no evidence of bismuth oxide on the surface. Furthermore, the Hall-Petch hardness approximation analysis revealed that there were other influences, which increased the hardness beyond the grain refinement effect.

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Study on Mechanical Properties and Microstructure of the Ultrastrong Low Alloy Wear‐Resistant Steel

Zhang

et al. 2020

steel research int.

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Herein, a kind of the ultrastrong low alloy wear‐resistant steel suitable for excavator bucket teeth is prepared. The ultrastrong steel with good toughness and wear resistance is successfully prepared by the forging, quenching, and tempering processes. The yield strength, tensile strength, elongation, and hardness of the ultrastrong steel reached up to 1700, 1960 MPa, 7%, and 563HV, respectively. Optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscope (TEM) are used to observe the microstructures of the ultrastrong steel. After the forging, quenching, and tempering, two types of martensite laths are formed in the matrix of the ultrastrong steel, i.e., the coarse laths with low‐density dislocations and the thin laths with high‐density dislocations and some ε‐carbides. Low‐temperature tempering allows the carbides to precipitate in large quantities, and maintains the matrix with high density dislocations in the thin laths, which is the micromechanism of the steel with high strength and high toughness, and good wear resistance.

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Microstructural changes produced by hot forging in a C300 Maraging Steel

Cited by 25 publications

References 16 publications

Structural Study of Undeformed and Deformed Maraging C300 Steels Using X-ray Diffraction Measurements

Structural Study of Undeformed and Deformed Maraging C300 Steels Using X-ray Diffraction Measurements

Study of Microstructure and Mechanical Properties of Commercially Pure Sn and Sn-4%Bi Alloys Fabricated by Permanent Mold Gravity Casting and Forging

Study on Mechanical Properties and Microstructure of the Ultrastrong Low Alloy Wear‐Resistant Steel

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