Bulk-surface hardening as a method for increasing strength, reliability, and service life of machine parts

1995 ◽  
Vol 37 (11) ◽  
pp. 433-440
Author(s):  
K. Z. Shepelyakovskiil
Keyword(s):  
Service Life ◽  
Surface Hardening ◽  
Bulk Surface ◽  
Machine Parts

Theoretical justifi cation for use of combined methods for hardening of surfaces of machine parts in order to control their fretting resistance

2020 ◽  
pp. 339-342
Author(s):  
V.F. Bez’yazychny ◽  
M.V. Timofeev ◽  
R.V. Lyubimov ◽  
E.V. Kiselev
Keyword(s):  
Surface Layer ◽  
Fatigue Limit ◽  
Surface Hardening ◽  
Theoretical Justification ◽  
Hardening Process ◽  
Subsequent Application ◽  
Machine Parts ◽  
Combined Methods

The theoretical justification for the hardening process of the surface layer of machine parts for combined methods of surface hardening with subsequent application of strengthening coatings, as well as reducing or increasing the fatigue limit due to the fretting process is presented.

Improving the Durability of Machine Parts Using a Combined Method

2019 ◽  
Vol 946 ◽  
pp. 37-41 ◽  
Author(s):  
A.P. Yakovleva
Keyword(s):  
Surface Roughness ◽  
Surface Hardening ◽  
Surface Hardness ◽  
Processing Method ◽  
Processing Conditions ◽  
Roughness Parameters ◽  
Combined Method ◽  
Cnc Lathe ◽  
Operational Life ◽  
Machine Parts

A combined processing method for improving the performance features of machine parts (durability), that works under intense wear and high lubricated or boundary friction has been developed; a working installation based on a CNC lathe has been developed. The research on resulting surface hardness material of steels: С45Е; 1.1191 (1 option); SA-240 TP 310S (2 option); 34CrNiMo6, 36CrNiMo4, 40NiCrMo4KD (3 option) and hardening depth variation under different combined processing conditions has been carried out. Surface roughness parameters have been calculated. The suggested method can increase the operational life of a machine part due to improving features, such as surface hardening, creating a favorable surface topography.

Use of steel 45 for bulk-surface hardening of universal joints

1980 ◽  
Vol 22 (9) ◽  
pp. 627-630
Author(s):  
V. A. Ognevskii ◽  
G. A. Ostrovskii ◽  
A. M. Ryskind ◽  
I. N. Shklyarov
Keyword(s):  
Surface Hardening ◽  
Bulk Surface ◽  
Universal Joints

Complex bulk-surface hardening of materials using a highly concentrated heat source

1988 ◽  
Vol 30 (5) ◽  
pp. 317-325
Author(s):  
L. K. Leshchinskii ◽  
S. S. Samotugin ◽  
I. I. Pirch ◽  
A. V. Puiko ◽  
N. Kh. Solyanik
Keyword(s):  
Heat Source ◽  
Surface Hardening ◽  
Bulk Surface ◽  
Hardening Of Materials

scholarly journals Influence of overlay layers on the abrasive wear

2012 ◽  
Vol 52 (No. 3) ◽  
pp. 115-122 ◽  
Author(s):  
P. Hrabě ◽  
R. Chotěborský ◽  
R. Medlín
Keyword(s):  
Chemical Composition ◽  
Service Life ◽  
Abrasive Wear ◽  
Friction And Wear ◽  
Significant Part ◽  
Alloying Elements ◽  
Manufacturing Processes ◽  
Operating Reliability ◽  
Machine Parts

A problem of machine parts wear decrease and in this way of the economical effectiveness of rapid wearable parts interferes with majority of manufacturing processes. Service life and operating reliability of a great number of machine parts is largely influenced by friction and wear, which take a significant part in the power and material losses. Wear affects significantly the maintenance, repair and renewal costs of machine parts, too. Today we can use a row of overlay materials. They differ above all by chemical composition, which determinates the conditions of use. Next conditions are the solidification of the welded-on material and the diffusion ability of main alloying elements, which determine the resultant structure of an overlay. The paper intents on multilayer overlays problem and on the number of overlay layers influence on abrasive wear.

Advantages and Properties of Laser-Hardened Surfaces

2020 ◽  
Vol 403 ◽  
pp. 91-96
Author(s):  
Stanislav Němeček
Keyword(s):  
Cyclic Loading ◽  
Service Life ◽  
Residual Stresses ◽  
Process Parameters ◽  
Fatigue Behavior ◽  
Influence Of Process Parameters ◽  
Machine Parts ◽  
And Behavior

The paper summarizes the findings of a study of properties and behavior of laser hardened surfaces. The influence of hardening on the service life and tribological resistance of molds and other machine parts will be presented. Furthermore, the influence of process parameters on residual stresses, their direction and magnitude, and related deformation, fatigue behavior under cyclic loading, etc. are described.

Peculiarities of Quality Ensuring in Parts from Ti-Based Alloy VT6 with Ultrafine-Grained Structure

2016 ◽  
Vol 684 ◽  
pp. 440-444
Author(s):  
Eduard Vilardovich Safin ◽  
Anatoliy Mikhailovich Smyslov
Keyword(s):  
Surface Hardening ◽  
High Load ◽  
Ultrafine Grained Structure ◽  
Technological Factors ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Machine Parts ◽  
Directed Change

The work analyzes application perspectives of Ti-based alloy VT6 (Ti-6Al-4V) with an ultrafine-grained structure with different grain sizes as structural material to produce high-load machine parts. The paper considers technological factors for ensuring quality of parts with account of assumed conditions of their exploitation, differently directed change of mechanical properties with reduction of an average grain size and choice of surface hardening technique.

scholarly journals Surface Hardening of Machine Parts Using Nitriding and TiN Coating Deposition in Glow Discharge

Machines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 42
Author(s):  
Alexander Metel ◽  
Sergey Grigoriev ◽  
Yury Melnik ◽  
Marina Volosova ◽  
Enver Mustafaev
Keyword(s):  
Surface Hardening ◽  
Gas Pressure ◽  
Hard Coatings ◽  
Parallel Plates ◽  
Study Results ◽  
Liquid Titanium ◽  
Combined Hardening ◽  
Machine Parts ◽  
Coating Synthesis ◽  
Density Of Electrons

Surface hardening of machine parts substantially improves their performance. The best results are obtained when combined hardening consists of surface nitriding and subsequent deposition of hard coatings. The nitriding of machine parts immersed in the plasma of glow coatings have been studied, and the study results are presented. Titanium atoms for coating synthesis are obtained via titanium evaporation in a hollow molybdenum anode of the discharge. Stable evaporation of titanium occurs only when the power density of electrons heating the liquid titanium does not exceed ~500 W/cm2. To start evaporation, it is only necessary to reduce the gas pressure to 0.02 Pa. To stop evaporation, it is enough to increase the gas pressure to 0.1 Pa. Fast argon and nitrogen atoms used for cleaning the machine parts, heating them, and bombarding the growing coating are obtained using a grid composed of plane-parallel plates under high negative voltage and immersed in plasma.

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