scholarly journals Morpho-Structural and Mechanical Characterization of Alloyed Steel

2019 ◽  
Vol 70 (11) ◽  
pp. 3847-3850
Author(s):  
Ecaterina Magdalena Modan ◽  
Adriana Gabriela Plaiasu ◽  
Maria Magdalena Dicu ◽  
Marian Catalin Ducu ◽  
Sorin Georgian Moga ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Atmospheric Pressure ◽  
High Speed ◽  
High Speed Steel ◽  
Optical Scanning ◽  
Magnetic Circuits ◽  
Hardness Tests ◽  
Composition Changes ◽  
Industrial Frequency

Our research focuses on the microstructure and mechanical properties of S6-5-2 speed steel. Studying austenite transformation in martensite and chemical composition changes of high speed steel, under heating conditions for austenitisation and cooling in oil bath, both performed under sub-atmospheric pressure (in rarefied atmospheres) is experimentally determined. The fields were these alloys can be preferred are: the electrical machines for avionics, the magnetic circuits of ultra-rapid relays and of other devices working in DC fields, the measure transformers and other transformers supplied on industrial frequency. To analyze microstructure�s modifications a combination of optical, scanning and electron microscopy was used. The mechanical properties were measured by hardness tests.

scholarly journals Morpho-Structural and Mechanical Characterization of Alloyed Steel

2019 ◽  
Vol 70 (11) ◽  
pp. 3847-3850
Author(s):  
Ecaterina Magdalena Modan ◽  
Adriana Gabriela Plaiasu ◽  
Maria Magdalena Dicu ◽  
Marian Catalin Ducu ◽  
Sorin Georgian Moga ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Atmospheric Pressure ◽  
High Speed ◽  
High Speed Steel ◽  
Optical Scanning ◽  
Magnetic Circuits ◽  
Hardness Tests ◽  
Composition Changes ◽  
Industrial Frequency

Our research focuses on the microstructure and mechanical properties of S6-5-2 speed steel. Studying austenite transformation in martensite and chemical composition changes of high speed steel, under heating conditions for austenitisation and cooling in oil bath, both performed under sub-atmospheric pressure (in rarefied atmospheres) is experimentally determined. The fields were these alloys can be preferred are: the electrical machines for avionics, the magnetic circuits of ultra-rapid relays and of other devices working in DC fields, the measure transformers and other transformers supplied on industrial frequency. To analyze microstructure�s modifications a combination of optical, scanning and electron microscopy was used. The mechanical properties were measured by hardness tests.

Microstructure, thermal, and mechanical characterization of rapidly solidified high strength Fe84.3Cr4.3Mo4.6V2.2C4.6

2010 ◽  
Vol 25 (6) ◽  
pp. 1164-1171 ◽  
Author(s):  
A. Schlieter ◽  
U. Kühn ◽  
J. Eckert ◽  
H-J. Seifert
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
High Strength ◽  
Cast State ◽  
High Fracture ◽  
Complex Carbides ◽  
Rapidly Solidified ◽  
Heating Up

Systematic microstructural and mechanical investigations of the Fe84.3Cr4.3Mo4.6V2.2C4.6 alloy cast under special manufacturing conditions in the as-cast state and after specific heat treatment are presented to point out that the special manufacturing of the alloy led to high compression strength (up to 4680 MPa) combined with large fracture strain (about 20%) already in the as-cast state. One select chemical composition of the alloy, which was mentioned previously [Kühn et al., Appl. Phys. Lett.90, 261901 (2007)] enhanced mechanical properties already in the as-cast state. Furthermore, that composition is comparable to commercial high-speed steel. By the special manufacturing used, a high purity of elements and a high cooling rate, which led to a microstructure similar to a composite-like material, composed of dendritic area (martensite, bainite, and ferrite) and interdendritic area (e.g., complex carbides). The presented article demonstrates an alloy that exhibits already in the as-cast state high fracture strength and large ductility. Furthermore, these outstanding mechanical properties remain unchanged after heating up to 873 K.

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

Tribological Characterization of Machining at Very Small Contact Areas

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Michael R. Lovell ◽  
P. Cohen ◽  
Pradeep L. Menezes ◽  
R. Shankar
Keyword(s):  
High Speed ◽  
Friction Mechanisms ◽  
High Speed Steel ◽  
Small Scale ◽  
Machining Processes ◽  
Macroscopic Theory ◽  
Contact Areas ◽  
Tribological Characterization ◽  
Physical Phenomena

When machining miniaturized components, the contact conditions between the tool and the workpiece exhibit very small contact areas that are on the order of 10−5 mm2. Under these conditions, extremely high contact stresses are generated, and it is not clear whether macroscopic theories for the chip formation, cutting forces, and friction mechanisms are applicable. For this reason, the present investigation has focused on creating a basic understanding of the frictional behavior in very small scale machining processes so that evaluations of standard macroscale models could be performed. Specialized machining experiments were conducted on 70/30 brass materials using high-speed steel tools over a range of speeds, feeds, depths of cut, and tool rake angles. At each operating condition studied, the friction coefficient and the shear factor τk were obtained. Based on the experimental results, it was determined that the standard macroscopic theory for analyzing detailed friction mechanisms was insufficient in very small scale machining processes. An approach that utilized the shear factor, in contrast, was found to be better for decoupling the physical phenomena involved. Utilizing the shear factor as an analysis parameter, the parameters that significantly influence the friction in microscale machining processes were ascertained and discussed.

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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