Wear of Tool Steels as Cropping Blades

1982 ◽  
Vol 104 (2) ◽  
pp. 79-84
Author(s):  
S. W. Lui ◽  
M. K. Das
Keyword(s):  
Carbon Steel ◽  
High Speed ◽  
High Speed Steel ◽  
Medium Carbon Steel ◽  
Low Carbon ◽  
Tool Steels ◽  
Digital Technique ◽  
Sem Images ◽  
Billet Quality ◽  
Steel Aisi

Wear performance of some tool steels such as cold working steel (AISI D2) and high speed steel (AISI M2) in high speed cropping are investigated for four groups of work materials, viz., (i) low carbon steel (AISI 1023), (ii) medium carbon steel (AISI 1039), (iii) ball bearing steel (AISI 52100), and (iv) austenitic stainless steel. The tool wear profiles and wear volumes are monitored through a digital technique at long intervals and the resulting deterioration of the billet quality was noted. The results confirm the trend found in other fabrication processes that the wear is much lower for the materials in Groups a and b as compared to the other two groups containing high alloying elements. The wear mechanisms, as observed through SEM images, are found to be quite different for these cases. Another observation relates to the fact that within the range investigated, the billet quality remains unaffected with the exception of the blade face angularity. Thus, the blades have surprisingly high tool life.

Surface Age-Hardened High Speed Steel with High Co Content Formed on Undecarburized Carbon Steel

2005 ◽  
Vol 475-479 ◽  
pp. 187-190 ◽  
Author(s):  
Yan Mei Zhang ◽  
Yan Ping Liu ◽  
Zhong Hou Li ◽  
Zhong Xu
Keyword(s):  
Carbon Steel ◽  
High Speed ◽  
High Speed Steel ◽  
Alloying Elements ◽  
Age Hardening ◽  
Alloyed Layer ◽  
Low Carbon ◽  
Heat Treated ◽  
Glow Plasma ◽  
Plasma Surface Alloying Technique

Tungsten, molybdenum and cobalt were co-diffused into the surface of undecarburized 45 steel at 1150 °C for 6 hours by a double glow plasma surface alloying technique. A Fe-W-Mo-Co type gradient surface alloyed layer with very low carbon content was formed. Thickness of the surface alloyed layer is 225.2μm. Concentrations of alloying elements Co, W and Mo in the alloyed layer are mostly ranged from 21 to 14 wt.%, 12 to 6 wt.% and 7 to 5 wt.%, respectively. The concentrations of alloying elements basically meet the requirements of W11Mo7Co23 type age-hardened high speed steel. The alloyed samples were solution heat treated, ageing and high-temperature tempering. The results show that the surface alloyed layer formed on 45 steel exhibits very strong age-hardening property and anti-temper softening ability as the metallurgical age-hardened high speed steel, the surface age-hardened high speed steel on ingot and decarburized carbon steel.

Aluminum nitride buffer layer for diamond film growth

1996 ◽  
Vol 11 (7) ◽  
pp. 1810-1818 ◽  
Author(s):  
V. P. Godbole ◽  
J. Narayan
Keyword(s):  
Aluminum Nitride ◽  
Buffer Layer ◽  
Diamond Film ◽  
High Speed ◽  
Film Growth ◽  
High Speed Steel ◽  
Bearing Steel ◽  
Low Carbon ◽  
Wide Range ◽  
Steel Substrates

The role of aluminum nitride (AlN) as a buffer layer on the nucleation and growth of diamond on silicon and steel substrates during hot filament chemical vapor deposition (HF-CVD) has been investigated systematically. The scanning Auger electron microscopy (AES) is employed to study chemistry and content of carbon on the surface and in subsurface regions of AlN as a function of HF-CVD parameters. It is found that AlN offers an excellent diffusion barrier for carbon over a wide range of temperature and hydrocarbon content of CVD gas environment, with simultaneous inhibition of graphitization. It also facilitates nucleation of diamond phase. The surface reactions between AlN and carbon are discussed in terms of hydrogen-assisted phase transformations. We have developed a two-step procedure to obtain a continuous diamond film on steel substrates. The characteristic features of AlN have been exploited to obtain adherent and graphite-free diamond deposits on various types of steels, including low carbon steel, tool steel, high speed steel, and bearing steel.

Kinetic Study of the Growth of Hard Layers on a Low Carbon Steel

MRS Advances ◽  
2017 ◽  
Vol 2 (50) ◽  
pp. 2809-2817
Author(s):  
Daniel S. Huerta ◽  
E.D. García Bustos ◽  
D.V. Melo Máximo ◽  
M. Flores Martinez
Keyword(s):  
Carbon Steel ◽  
Treatment Time ◽  
Low Carbon Steel ◽  
Thermochemical Treatment ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Kinetic Growth ◽  
Steel Aisi ◽  
Growth Constants ◽  
Substrate Hardness

ABSTRACTIn the present work the kinetic growth is analyzed for a hard coating applied on a low carbon steel AISI 8620. A thermochemical treatment of bored with dehydrated paste at temperatures of 900, 950 and 1000 °C with a residence time of 2, 4, 6 and 8 h. The morphology and types of borides formed on the surface of the steel were evaluated by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The layer formed has a size of 20 to 113 μm which will be dependent on the process temperature, the treatment time and the alloy elements of the substrate. Hardness of 1493-1852 HV are presented for treatment times and temperatures established in this study. The kinetics of growth were determined and analyzed using a mathematical model of diffusion, evaluating the penetration of the biphasic layer that is determined as a function of the time and temperature of the thermochemical treatment (TCT). The results show the increase in the growth constants (k) with respect to the bored temperatures. The activity energy (Q) of the material AISI 8620 was also obtained.

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