Regularities of the formation of structure and mechanical properties in sintered materials from atomized iron powders

1979 ◽  
Vol 18 (3) ◽  
pp. 181-186
Author(s):  
A. F. Zhornyak ◽  
V. E. Oliker
Keyword(s):  
Mechanical Properties ◽  
Iron Powders ◽  
Sintered Materials

Diffusion-alloying sintering of Cr–Mo pre-alloyed iron powders with carbon: The effect of the carbon introduction method on the sinter’s properties

2021 ◽  
Vol 112 (1) ◽  
pp. 48-56
Author(s):  
Lubomir Anestiev ◽  
Jordan Georgiev ◽  
Seryozha Valkanov ◽  
Marcela Selecká ◽  
Sabine Cherneva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dissolution Rate ◽  
Reasonable Assumption ◽  
Micro Structure ◽  
Iron Powders ◽  
Base Powder ◽  
Alloyed Iron ◽  
Iron Based

Abstract The influence of the carbon introduction method on the microstructure and the mechanical properties of sinters produced from iron-based powders by diffusion-alloying sintering has been studied. Two methods of carbon introduction were tested: (1) Premixing of the base powder with graphite, and (2) Coating of the base powder with a carbon-containing substance. The results obtained could be summarized as (1) The microstructure and the mechanical properties depend on the method of carbon introduction; (2) The sinters produced from coated powders possess finer micro-structure, improved homogeneity, and in two out of three of the studied compositions, better mechanical properties. Based on the results obtained, a reasonable assumption was made that the method of carbon introduction affects the dissolution rate of the carbon additive, thus affecting the micro-structure and the mechanical properties of the sinter.

scholarly journals Are Large Particles of Iron Detrimental to Properties of Powder Metallurgy Steels?

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 431
Author(s):  
Ahmed Abdallah ◽  
Mahdi Habibnejad-Korayem ◽  
Dmitri V. Malakhov
Keyword(s):  
Powder Metallurgy ◽  
Apparent Density ◽  
Heavy Tail ◽  
Number Density ◽  
Iron Powders ◽  
Distribution Histogram ◽  
Compositional Uniformity ◽  
Large Particles ◽  
Size Distribution Histogram ◽  
Sintered Materials

It is experimentally shown that a removal of particles exceeding 100 microns in size from iron powders typically used in the fabrication of medium density powder metallurgy steels has a weak effect on apparent density, flowability and compressibility of blends as well as on density and strength of green bodies. An elimination of such particles, i.e., cutting off a heavy tail of a size distribution histogram at the 100 μm threshold, improves a compositional uniformity of sintered materials, but has no noticeable beneficial effect upon the strength of a final product, which is likely be determined by a fraction of pores and their shapes. A presence of soft pearlitic inclusions hardly matters unless their number density becomes so large that a 3D continuity (integrity) of a hard martensitic matrix is lost. This finding suggests that such an expensive preparatory step as sieving away large particles from as-received mixtures would bear no technological advantages. It was experimentally found that an attempt to lower the threshold below 100 μm noticeably worsened apparent density, flowability and compressibility.

Cold compaction of iron powders—relations between powder morphology and mechanical properties

2002 ◽  
Vol 126 (1) ◽  
pp. 65-74 ◽  
Author(s):  
D Poquillon ◽  
J Lemaitre ◽  
V Baco-Carles ◽  
Ph Tailhades ◽  
J Lacaze
Keyword(s):  
Mechanical Properties ◽  
Powder Morphology ◽  
Cold Compaction ◽  
Iron Powders ◽  
Morphology And Mechanical Properties

Preparation and Thermal Fatigue Behaviors of Silicon Nitride Nano-Ceramics

2015 ◽  
Vol 1095 ◽  
pp. 48-52
Author(s):  
Chun Yan Tian ◽  
Hai Jiang
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Thermal Fatigue ◽  
Fatigue Properties ◽  
Hot Press ◽  
Thermal Fatigue Resistance ◽  
Amorphous Si ◽  
Hot Press Sintering ◽  
Spherical Grains ◽  
Sintered Materials

Silicon nitride nanoceramics were prepared by hot press sintering amorphous Si3N4and α-Si3N4nanopowders. The microstructures as well as the effect of starting powders size on the mechanical properties and thermal fatigue properties were investigated. The results show that microstructure of sintered materials consists of spherical grains with approximate size of 100 nm. The mechanical properties and thermal fatigue resistance vary with the addition of α–Si3N4powders. The maximum flexural strength and fracture toughness are obtained when the α–Si3N4powders amount is 40wt.%. And the Si3N4nanoceramic added 40wt.% α–Si3N4powders has the best capability to suppress crack propagation and the highest critical temperature difference.

1125 On Evaluation of Mechanical Properties of Sintered Materials

2008 ◽  
Vol 2008.6 (0) ◽  
pp. 265-266
Author(s):  
Jyuhachi ODA ◽  
Sinobu SAKAI ◽  
Ryota NOBE ◽  
Kouji YAMADA ◽  
Susumu MIYAKAWA
Keyword(s):  
Mechanical Properties ◽  
Sintered Materials

Spark Plasma Sintering of Mechanically Activated Ni and Al Powders

2014 ◽  
Vol 1040 ◽  
pp. 772-777 ◽  
Author(s):  
Lilia I. Shevtsova ◽  
Michail A. Korchagin ◽  
Alexander Thömmes ◽  
Vyacheslav I. Mali ◽  
Alexander G. Anisimov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Temperature Synthesis ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Ni Powder ◽  
Spark Plasma ◽  
Paper Structure ◽  
Sintered Materials

In this paper structure and mechanical properties of Ni3Al intermetallic compound was studied. The materials was fabricated according to different schemes, which combined mechanical alloying of Ni and Al powders, self-propagating high temperature synthesis (SHS) and spark plasma sintering (SPS). Relative density of all sintered samples was ~ 97 %. Microhardness of the sintered materials ranged from 6100 to 6300 MPa. SPS of 86.71 % wt. Ni and 13.29 % wt. Ni powder at 1100 °C led to formation of material with the highest level of tensile strength equal to 400 MPa.

scholarly journals Sintered FeCuRe Alloys Produced from Commercially Available Powders

2017 ◽  
Vol 62 (3) ◽  
pp. 1713-1720
Author(s):  
J. Borowiecka-Jamrozek
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Metal Matrix ◽  
General Purpose ◽  
Cobalt Powder ◽  
Static Tensile ◽  
Properties Of Materials ◽  
Sintered Materials ◽  
Graphite Mould ◽  
Scanning Electron

Abstract This paper discusses the mechanical properties of materials fabricated from commercially available powders designed for use as a metal matrix of diamond-impregnated composites. The powders with the catalogue numbers CSA and CSA800 produced in China were tested under laboratory conditions. The specimens were fabricated in a graphite mould using hot pressing. The materials were analysed for density, porosity, hardness and static tensile strength. A scanning electron microscope (SEM) was employed to observe the microstructure and fracture surfaces of the specimens. The experimental data was used to determine how the chemical composition of the powders and the process parameters affected the microstructure and properties of the materials. The properties of the sintered materials produced from the Chinese powders were compared with the properties reported for specimens fabricated from cobalt powder (Co SMS). Even though the hot pressed CSA and CSA800 powders had inferior mechanical properties to their cobalt analogue, they seem well-suited for general-purpose diamond-impregnated tools with less demanding applications.

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