Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

This work investigated the isothermal holding time dependence of the densification, microstructure, weight loss and tensile properties of Fe-Mn-Si powder compacts. Elemental Fe, Mn and Si powder mixtures with a nominal composition of Fe-28Mn-3Si (in weight percent) were ball milled for 5h and subsequently pressed under a uniaxial pressure of 400 MPa. The compacted Fe-Mn-Si powder mixtures were sintered at 1200 ℃ for 0, 1, 2 and 3 h, respectively. In general, the density, weight loss and tensile properties increased with the increase of isothermal holding time. A significant increase in density, weight loss and tensile properties occurred in the compacts isothermally holding for 1 h, as compared to those with no isothermal holding. However, further extension of isothermal holding time (2 and 3 h) only played a limited role in promoting the density and tensile properties. The weight loss of the sintered compacts was mianly caused by the sublimation of Mn in Mn depletion region on the surface layer of the sintered Fe-Mn-Si compacts. The length of the Mn depletion region increased as isothermal holding time increased. A single α-Fe phase was detected on the surface of all the sintered compacts, and the locations beyond the Mn depletion region were comprised of a dual dominant γ-austenite and minor ε-martensite.

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Effect of Microwave Sintering Parameters on the Physical and Mechanical Properties of Pure Ti and Blended Elemental Ti Alloys

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.770.52 ◽

2018 ◽

Vol 770 ◽

pp. 52-59

Author(s):

Stiliana Raynova ◽

M. Ashraf Imam ◽

Hunter Taylor ◽

Fei Yang ◽

Leandro Bolzoni

Keyword(s):

Tensile Properties ◽

Sintering Temperature ◽

Microwave Sintering ◽

Physical And Mechanical Properties ◽

Porosity Distribution ◽

Powder Mixtures ◽

Blended Elemental ◽

Ti Alloys ◽

Ti Powder ◽

Powder Compacts

Microwave sintering (MWS) was used to consolidate hydride de-hydride Ti powder and blended elemental Ti6Al4V, Ti5Fe and Ti5Al5Mo5V3Cr (Ti5553) powder mixtures. The amount of powders used to prepare the powder compacts was scaled up to 500g.The effect of the MWS conditions on the relative density, porosity distribution, microstructure and tensile properties were studied. Furthermore, uniformity in distribution of the alloying elements was checked. For most of the materials considered, a combinations of sintering temperature of 1200oC and 1300oC and holding time of 5 to 30 min resulted in significantly improved density. Nevertheless sintering temperature of at least 1300oC was required for pore coalescence and high tensile properties.

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METRODE 20.70 Nb

Alloy Digest ◽

10.31399/asm.ad.ni0606 ◽

2003 ◽

Vol 52 (4) ◽

Keyword(s):

Fracture Toughness ◽

Tensile Properties ◽

Arc Welding ◽

Nickel Alloys ◽

Submerged Arc Welding ◽

Inert Gas ◽

Nominal Composition ◽

Oxidation Resistant ◽

Nickel Base ◽

Submerged Arc

Abstract Metrode 20.70 Nb is a nickel-base consumable with a nominal composition of Ni, 20% Cr, and 2.5% Nb. This alloy is used to join a variety of oxidation-resistant nickel alloys. The product is a solid wire for tungsten inert gas (TIG), metal inert gas (MIG), and submerged arc welding (SAW). This datasheet provides information on tensile properties as well as fracture toughness. It also includes information on joining. Filing Code: Ni-606. Producer or source: Metrode Products Ltd.

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RIMA HAS C276

Alloy Digest ◽

10.31399/asm.ad.ni0593 ◽

2002 ◽

Vol 51 (11) ◽

Keyword(s):

Corrosion Resistance ◽

Tensile Properties ◽

Heat Treating ◽

Inert Gas ◽

Nominal Composition ◽

Corrosion Resistant ◽

Submerged Arc

Abstract RIMA HAS C276 is a Ni-Cr-Mo-W-type consumable with a nominal composition of Ni, 15% Cr, 16% Mo, 4% W, and 5% Fe. This alloy is used to join high-molybdenum-containing corrosion-resistant alloys to themselves and each other. The product is solid wire for tungsten inert gas (TIG), metal inert gas (MIG), and submerged arc (SAW) welding. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: Ni-593. Producer or source: Metrode Products Ltd.

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NIMROD C276, C276KS

Alloy Digest ◽

10.31399/asm.ad.ni0589 ◽

2002 ◽

Vol 51 (8) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

Tensile Properties ◽

Heat Treating ◽

Nominal Composition ◽

Corrosion Resistant ◽

Welding Consumables

Abstract NimRod C276 and C276KS are Ni-Cr-Mo-W-type welding consumables with a nominal composition of Ni, 15% Cr, 16% Mo, 4% W, and 5% Fe. They are used to join high-molybdenum-containing corrosion-resistant alloys to themselves and each other. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: Ni-589. Producer or source: Metrode Products Ltd.

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NIMROD C22KS

Alloy Digest ◽

10.31399/asm.ad.ni0588 ◽

2002 ◽

Vol 51 (7) ◽

Keyword(s):

Fracture Toughness ◽

Tensile Properties ◽

Heat Treating ◽

Nominal Composition ◽

Corrosion Resistant ◽

Nickel Chromium

Abstract Nimrod C22KS is a nickel-chromium-molybdenum-tungsten type consumable with a nominal composition of Ni, 22% Cr, 13.5% Mo, and 3% W and is used to join high-molybdenum corrosion-resistant alloys to themselves and each other. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and joining. Filing Code: Ni-588. Producer or source: Metrode Products Ltd.

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NIMROD 617KS

Alloy Digest ◽

10.31399/asm.ad.ni0583 ◽

2002 ◽

Vol 51 (5) ◽

Keyword(s):

Fracture Toughness ◽

High Temperature ◽

Weld Metal ◽

Tensile Properties ◽

Base Metal ◽

Heat Treating ◽

Nominal Composition

Abstract Nimrod 617KS is an Inconel-type consumable with a nominal composition of nickel, 24% Cr,12% Co, and 9% Mo and is used to join UNS N06617 and Nicrofer 6023 to themselves. The alloy is designed for high-temperature service and is often used as the weld metal in dissimilar cases to ensure the weld is as strong as the base metal. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and joining. Filing Code: Ni-583. Producer or source: Metrode Products Ltd.

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In-Situ High-Energy X-ray Diffraction Study of Austenite Decomposition During Rapid Cooling and Isothermal Holding in Two HSLA Steels

Metallurgical and Materials Transactions A ◽

10.1007/s11661-021-06192-x ◽

2021 ◽

Vol 52 (5) ◽

pp. 1812-1825

Author(s):

Sen Lin ◽

Ulrika Borggren ◽

Andreas Stark ◽

Annika Borgenstam ◽

Wangzhong Mu ◽

...

Keyword(s):

Isothermal Holding ◽

Weight Percent ◽

High Energy ◽

Decomposition Kinetics ◽

Bainitic Transformation ◽

Austenite Decomposition ◽

X Ray Diffraction ◽

Rapid Cooling ◽

X Ray

AbstractIn-situ high-energy X-ray diffraction experiments with high temporal resolution during rapid cooling (280 °C s−1) and isothermal heat treatments (at 450 °C, 500 °C, and 550 °C for 30 minutes) were performed to study austenite decomposition in two commercial high-strength low-alloy steels. The rapid phase transformations occurring in these types of steels are investigated for the first time in-situ, aiding a detailed analysis of the austenite decomposition kinetics. For the low hardenability steel with main composition Fe-0.08C-1.7Mn-0.403Si-0.303Cr in weight percent, austenite decomposition to polygonal ferrite and bainite occurs already during the initial cooling. However, for the high hardenability steel with main composition Fe-0.08C-1.79Mn-0.182Si-0.757Cr-0.094Mo in weight percent, the austenite decomposition kinetics is retarded, chiefly by the Mo addition, and therefore mainly bainitic transformation occurs during isothermal holding; the bainitic transformation rate at the isothermal holding is clearly enhanced by lowered temperature from 550 °C to 500 °C and 450 °C. During prolonged isothermal holding, carbide formation leads to decreased austenite carbon content and promotes continued bainitic ferrite formation. Moreover, at prolonged isothermal holding at higher temperatures some degenerate pearlite form.

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