Effect of surface roughness of the endurance of titanium alloy VT6 and the effectiveness of strain hardening it by surface plastic deformation

1980 ◽  
Vol 12 (8) ◽  
pp. 967-971
Author(s):  
L. D. Brondz
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Titanium Alloy ◽  
Strain Hardening ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Effect Of Surface

Investigating the Regularities of Surface Roughness Structuring while Processing with Surface Plastic Deformation for Calculation

2015 ◽  
Vol 756 ◽  
pp. 79-84
Author(s):  
Ivan Telkov
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Technological Process ◽  
Surface Plastic Deformation ◽  
Design Stage ◽  
Surface Plastic ◽  
Operating Modes ◽  
Roughness Profile

This paper describes the regularities of structuring of surface roughness at surface plastic deformation in order to revise calculation of operating modes at the design stage of the technological process. The formula of roughness profile that allows calculating its general parameters has been obtained.

OUTLOOKS IN SURFACE PLASTIC DEFORMATION USE TO DECREASE SURFACE ROUGHNESS IN ROLLING MILL PARTS STRENGTHENED WITH SVS-ELECTRODE MATERIALS

2020 ◽  
Vol 2020 (8) ◽  
pp. 4-12
Author(s):  
Aleksey Makarov ◽  
Anna Titova ◽  
A. Afonin ◽  
Alexander Kudryashov ◽  
Aleksandr Vladimirov
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Surface Layer ◽  
Rolling Mill ◽  
Mechanical Characteristics ◽  
Electrode Materials ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Electrospark Alloying ◽  
Micro Hardness

The purpose of this work consists in ensuring the required quality of micro-geometry and mechanical characteristics of a surface layer in rolling mill parts, in particular, surface roughness no more than Ra=2.5mkm and micro-hardness no less than 900 kgs/mm2. To ensure such micro-hardness in samples of 60HN steel there were applied coatings With the method of electrospark alloying with the use as an electrode synthetic hard tool materials based on titanium diboride (STIM-11) and titanium carbide (STIM-40NA) made by the method of self-propagating high-temperature synthesis. EIL-coatings made of thses materials are characterized with the thickness of 30mkm, micro-hardness up to 980 kgs/mm2, that exceeds four times micro-hardness of a non-hardened sample, and with roughness Ra=5…10mkm. To decrease roughness of EIL-coatings made of STIM materials for the first time there was used surface plastic deformation with smoothing that is a novelty of this investigation. Smoothing was carried out on a screw-cutting lathe with the aid of a flattener with TC6 tungsten-cobalt hard alloy indenter (r=6mm) at the rotational frequency n=70rev/min and at the indenter longitudinal feed S=0.05mm/rev and the smoothing force P=500N. As a result of smoothing the micro-hardness of surface layers made 990kgs/mm2, and roughness – Ra=1.6…1.8mkm. Conclusion: smoothing contributes to the decrease of surface layer roughness from 3 times (STIM-40NA) to 5.5 times (STIM-11) at the conservation of their mechanical characteristics that proves the outlook in use of such a technology for finishing parts surfaces strengthened with SVS-electrode materials by STIM method of electrospark alloying.

Technological Parameters Forming the Surface Texture in Hyper Productive Surface Plastic Deformation Processing

2017 ◽  
Vol 746 ◽  
pp. 114-119 ◽  
Author(s):  
Sergey N. Grigoriev ◽  
N.M. Bobrovskij ◽  
I.N. Bobrovskij ◽  
Cho-Pei Jiang
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Cast Iron ◽  
Surface Texture ◽  
Processing Time ◽  
High Strength ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Deformation Processing ◽  
Productive Surface

The hyper productive surface plastic deformation processing technology called as wide burnishing (WB) was developed in Russian Federation. The mechanics of new WB technology is different from the classic SPD technologies (rolling or burnishing). For example applied force during processing of burnishing is 150-300 N, of WB is 2500-5000 N due to condition of process implementation in mass production with limited processing time (3-4 turnovers of workpiece). WB also has a high degree of deformation due to a multiple deformation passes. To determine the optimal WB processing parameters single and double instrumental devices were implemented and tested. Specimens made of steel 40 and high-strength cast iron 75-50-03 were tested. Initial roughness of steel 40 specimen’s surface was Ra = 0.5 microns and high-strength cast iron was Ra = 0.85 microns. Results of surface texture parameters of processed parts such as surface roughness Ra of steel 40 and high-strength cast iron 75-50-03 under varying load values P and number of cycles (the number of workpieces revolutions during the period of burnishing) were acquired. It was established that the minimum Ra value of the processed surface correspond with values of P = 210 N/mm2 for steel 40 and P = 410 N/mm2 for high-strength cast iron 75-50-03 regardless of number of burnishing cycles. Plastic deformation mechanism (processing time and pressure on the surface) influences on the processed surface roughness formation. It is possible to assume that straining state forms at the optimal values of P in terms of achieving a minimum value of Ra in which the reached degree of hardening allows to minimize the height of the microscopic irregularities of the previous grinding processing. In this case there is no plastic flow of the metal surface layer.

Effect of surface plastic deformation on the development of fatigue cracks

1974 ◽  
Vol 6 (1) ◽  
pp. 93-95
Author(s):  
M. A. Balter ◽  
L. Ya. Gol'dshtein ◽  
A. A. Chernyakova ◽  
A. I. Reznik
Keyword(s):  
Plastic Deformation ◽  
Fatigue Cracks ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Effect Of Surface
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