Mechanical Properties of Composite Materials Consisting of M3/2 High Speed Steel Reinforced with Niobium Carbides

2007 ◽  
Vol 539-543 ◽  
pp. 756-762
Author(s):  
José A. Jiménez ◽  
Georg Frommeyer ◽  
Marta López ◽  
N. Candela ◽  
Oscar A. Ruano
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
High Speed ◽  
Rupture Strength ◽  
Deformation Behaviour ◽  
Niobium Carbide ◽  
High Speed Steel ◽  
Strain Rate Change ◽  
Three Point Bending ◽  
Yield Stress Increase

Fully dense composite materials of M3/2 high speed steel reinforced with 5, 10 and 15vol. % of high purity niobium carbide were developed using powder metallurgy processing. This work describes and discusses the mechanical behavior of the various composite systems. Mechanical properties were characterized by Rockwell hardness, compression and three point bending tests. It was found that the addition of ceramic particles causes a very small increase in the hardness and 0.2% yield strength, but a decrease in the transverse rupture strength is observed. In order to eliminate the influence of martensite on the mechanical properties, measurements were also conducted after tempering. After this treatment, the reinforced materials showed a moderate yield stress increase at room temperature respect to the unreinforced M3/2. However, the bend strength values were not affected significantly by this treatment. At high temperatures, the addition of reinforcement particles causes a slight increase in the strength. Strain rate-change tests in compression were performed at strain rates ranging from 3 x 10-6 to 2 x 10-3 s-1 in the temperature range from 650 to 750°C. The deformation behaviour was characterized by a stress exponent ranging from 5 to 7 and an activation energy for plastic deformation similar to that found in high alloyed ferritic steels.

Transverse Rupture Strength of M3:2 High Speed Steel Produced through Conventional Casting and Powder Metallurgy Techniques

2006 ◽  
Vol 514-516 ◽  
pp. 584-588
Author(s):  
Oscar O. Araujo Filho ◽  
João Franklin Liberati ◽  
Waldemar Alfredo Monteiro ◽  
Maurício David Martins das Neves ◽  
Luís Carlos Elias da Silva ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
Rupture Strength ◽  
Hot Isostatic Pressing ◽  
High Speed Steel ◽  
Liquid Phase Sintering ◽  
Bending Tests ◽  
Transverse Rupture Strength ◽  
Three Point Bending ◽  
Hardness Tests

The main aim of this work is to study the influence of the heat treatment on the transverse rupture strength of three M3:2 high speed steel obtained by differents techniques. PM Sinter 23 obtained by hot isostatic pressing (HIP) of gas atomized powders, a vacuum sintered high speed steel obtained by uniaxial cold compaction and liquid phase sintering of M3:2 water atomized powders and a conventional (cast to ingot and hot work) VWM3C were submitted to hardening in order to determine the influence of this treatment on the transverse rupture strength. The two PM high speed steels and the conventional one were submitted to heat treatment of hardening with austenitizing temperatures of 1140, 1160, 1180 and 1200 °C and tempering at 540 and 560 °C. The effectiveness of the heat treatment was determined by hardness tests (Rockwell C hardness). The microstructure was evaluated by scanning eletronic microscopy (SEM). At least five samples of these three high speed steels were manufactured, austenitized, quenched and tempered as described above and fractured in three point bending tests in order to evaluate the influence of this treatment on the transverse rupture strength (TRS).

Sintering Behavior and Mechanical Properties of High Speed Steel Powder Processed In Nitrogen-Based Atmosphere

2012 ◽  
Vol 59 (2) ◽  
Author(s):  
Samsiah Abdul Manaf ◽  
Mohd Asri Selamat ◽  
Ahmad Aswad Mahaidin ◽  
Talib Ria Jaafar
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Treatment Process ◽  
Cutting Tool ◽  
Rupture Strength ◽  
High Speed Steel ◽  
Steel Powder ◽  
Hydrogen Atmosphere ◽  
Sintering Behavior ◽  
Cutting Tool Insert

High speed steel (HSS) is a common material used in the manufacturing of cutting tool and other cutters. In this study, M3/2 HSS had been used to produce cutting tool insert through powder metallurgy (PM) route. The HSS was mixed with iron phosphorus (Fe3P) powders in a tubular mixer for 30 minutes by dry blending. The powder was compacted at pressure of 632 MPa (16 ton) and sintered at temperature range between 1100°C and 1225°C under nitrogen-hydrogen atmosphere. Further work was done through heat treatment process involving austenitising and tempering to improve the mechanical properties of the insert. The properties were determined through hardness testing and transverse rupture strength (TRS).

The Mechanical Properties of Organic Modified Epoxy Resin

2020 ◽  
Vol 43 (3) ◽  
pp. 10-14
Author(s):  
Georgel MIHU ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
Marina BUNEA ◽  
Rodica CHIHAI PEȚU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Mechanical Tests ◽  
Organic Modification ◽  
Three Point Bending ◽  
Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

Upgrading the microstructure and the mechanical properties of cast high speed steel

2001 ◽  
Vol 72 (2) ◽  
pp. 58-65 ◽  
Author(s):  
Saied El-Ghazaly ◽  
Tarek EI-Gammal ◽  
Ahmed EI-Sabbagh ◽  
Adel Nofal ◽  
Mohammed Abbas
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
High Speed Steel

The Influence of Sintering Atmosphere for Metal Injection Moulding M2 High Speed Steel

2014 ◽  
Vol 879 ◽  
pp. 169-174
Author(s):  
R. Sauti ◽  
N.A. Wahab ◽  
M.A. Omar ◽  
I.N. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Injection Moulding ◽  
High Speed ◽  
High Speed Steel ◽  
Steel Powder ◽  
Sintering Atmosphere ◽  
Temperature Range ◽  
Waste Rubber ◽  
Vacuum Atmosphere ◽  
M2 High Speed Steel

This paper reports on the compatibility of waste rubber as binder for M2 High Speed Steel injection moulding. The feedstock was prepared at a powder loading of 65 vol.% using 22μm M2 High Speed Steel powder and the binders consisting of 55wt.% paraffin wax, 21wt.% polyethylene, 14wt.% waste rubber and 10wt.% stearic acid. The specimens were then sintered in vacuum and 95%N2/5%H2 atmosphere. The sintering in vacuum atmosphere occurred within a temperature range from1200°C to 1260°C, whilst the 95%N2/5%H2 atmosphere was carried out within a temperature range from 1220°C to 1300°C. The effects of the sintering atmosphere and temperature on the physical properties, mechanical properties and microstructure were investigated.

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