Influence of Diffusion Saturation from Liquid Metal Media Solutions to Mechanical Properties of Hard Alloy Cutting Tool

2020 ◽  
Vol 22 (1) ◽  
pp. 54-64
Author(s):  
Eduard Bobylyov ◽  
◽  
Natalya Klokova ◽  
Keyword(s):  
Mechanical Properties ◽  
Liquid Metal ◽  
Hard Alloy ◽  
Cutting Tool ◽  
Diffusion Saturation

The effect of pressure on the compressibility of aluminum alloys

2020 ◽  
pp. 102-107
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Liquid Metal ◽  
Control Systems ◽  
Physical And Mechanical Properties ◽  
Reliable Data ◽  
Output Process ◽  
Automated Control ◽  
Input And Output ◽  
Crystallization Under Pressure

To obtain reliable data on the properties of liquid metal and create automated control systems, the technological process of molding with crystallization under pressure is studied. A mathematical model of the input and output process parameters is developed. It is established that the compressibility of the melt can represent the main controlled parameter influencing on the physical-mechanical properties of the final products. The obtained castings using this technology are not inferior in their physical and mechanical properties to those produced by forging or stamping.

Porosity Development and Modification in Al-Si Alloys: Effect of P and Sr

2019 ◽  
Author(s):  
J. Campbell ◽  
Murat Tiryakioğlu
Keyword(s):  
Mechanical Properties ◽  
Liquid Metal ◽  
Crack Size ◽  
Primary Si ◽  
Interdendritic Flow ◽  
Oxide Bifilms ◽  
Lower Temperature ◽  
Porosity Development ◽  
Silicon Particles ◽  
Crystalline Growth

The benefits of Sr additions to Al–Si alloys to modify the eutectic are often impaired by the development of porosity, sometimes to the degree that benefits are negated. Experimental reports are reviewed in this paper, suggesting an explanation in terms of the oxide population in the melt. The unmodified silicon particles are nucleated by AlP, which has in turn nucleated on oxide bifilms. The oxide bifilms, which are essentially cracks, are straightened by the crystalline growth of Si particles, leading to increased crack size and consequently reduced mechanical properties. The addition of Sr improves properties by suppressing the formation of Si on bifilms and thereby preventing the straightening of the pre-existing cracks. Si is now forced to precipitate at a lower temperature as a coral-like eutectic. Unfortunately, the bifilms are now freed (the primary Si particles no longer exist to grow around and sequester the bifilms), remaining in suspension in the liquid metal, allowing them to act to block interdendritic flow and aid the initiation of the formation of pores, countering the benefits of the improved structure.

scholarly journals Increase of Durability of Austenitic Steel by Overlap of Carburization and Diffusion Saturation from Liquid Metal Medium Solutions Technologies

2020 ◽  
pp. 502-511
Author(s):  
Aleksandr G. Sokolov ◽  
Eduard E. Bobylyov
Keyword(s):  
Liquid Metal ◽  
New Technology ◽  
Diffusion Saturation ◽  
Surface Layers ◽  
Metal Medium ◽  
Effective Technology ◽  
Thickness Of Diffusion Layer ◽  
Liquid Metal Medium ◽  
Technological Impact ◽  
And Diffusion

This paper investigated the overlap of carburization and diffusion saturation from liquid metal medium solutions technologies. The carburization of austhenic steel able to increase of its wear resistance and microhardness to 700HV. But this kind of treatment provided to reduction of corrosion resistance. This effect conditioned by formation of chromium carbides, herewith austenite of steel impoverished of chromium. This paper proposes the new technology lets increase the durability of asthenic steels, using carburization and diffusion saturation in eutectic Pb-Bi-Li medium with adding of nickel and chromium. The most effective technology consisted of previous carburization, diffusion saturation and final carburization. First carburization provided to increase of surface layers microhardness to 2800 MPa, diffusion saturation to 7500 MPa, the final carburization to 19500 MPa. The properties of coating depended of combination of technological impact and technological modes of every stage of technological process: temperature and duration. The temperature influenced to microhardness of coating: when the temperature increased microhardness decreased. The duration of diffusion saturation influenced to thickness of diffusion layer: when the duration increased the thickness increased too

Effect of diamond grinding on the physico-mechanical properties of the hard alloy T15K6 and steel 40Kh

1968 ◽  
Vol 2 (6) ◽  
pp. 464-467
Author(s):  
V. I. Ivanets ◽  
M. G. Loshak ◽  
Yu. I. Babei ◽  
G. V. Karpenko
Keyword(s):  
Mechanical Properties ◽  
Hard Alloy ◽  
Steel 40Kh ◽  
Diamond Grinding

Mechanical Properties and Microstructure of Self-Lubricating Ceramic Cutting Tool Materials

2004 ◽  
Vol 471-472 ◽  
pp. 221-224 ◽  
Author(s):  
Jian Xin Deng ◽  
Tong Kun Cao ◽  
Jia Lin Sun
Keyword(s):  
Mechanical Properties ◽  
Cutting Tool ◽  
Solid Lubricants ◽  
Polished Surface ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Ceramic Cutting Tool ◽  
Micro Cracks ◽  
The Difference ◽  
Cutting Tool Materials

Al2O3/TiC ceramic tool materials with the addition of solid lubricants such as BN and CaF2 were produced by hot pressing. Effect of the solid lubricants on the microstructure and mechanical properties has been studied. Results showed that AlN phase resulted from the reaction of Al2O3 with BN was formed in Al2O3/TiC/BN composite after sintering. Significant micro-cracks resulted from the residual stress owing to the difference in the thermal expansion coefficient were found on the polished surface, and caused large mechanical properties degradation. While Al2O3/TiC/CaF2 composite showed higher flexural strength, fracture toughness, and hardness compared with that of Al2O3/TiC/BN composite owing its porosity absent and finer microstructure.

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