Influence of the Structure of VT22 Alloy on the Surface Hardening in the Course of Deformation-Diffusion Treatment

2017 ◽  
Vol 53 (2) ◽  
pp. 158-164
Author(s):  
І. М. Pohrelyuk ◽  
S. E. Sheikin ◽  
S. М. Lavrys’ ◽  
D. А. Serhach ◽  
A. E. Baitser
Keyword(s):  
Surface Hardening ◽  
Vt22 Alloy ◽  
Diffusion Treatment

The Effects of Low Temperature Carbon Diffusion Treated Fasteners on Thread Galling Resistance

2017 ◽  
Author(s):  
Karson P. Clark
Keyword(s):  
Low Temperature ◽  
Surface Hardening ◽  
Chemical Elements ◽  
Surface Hardness ◽  
Carbon Diffusion ◽  
Initial Study ◽  
Chemical Company ◽  
Diffusion Treatment ◽  
Class 1 ◽  
Limited Scope

Kolsterising® is a low temperature carbon diffusion treatment, referred to as carburization, in which carbon is forced into the surface of metal. This results in a significant increase of surface hardness without the formation of crystalline solids or chemical elements.1 Carburization is not a coating process therefore the possibility of delamination is eliminated with the process. 2 Low temperature carbon diffusion treatment is being considered by a chemical company to possibly aid in the disassembly of higher alloy fasteners in attempts to reduce maintenance and equipment overhaul time during plant outages. This paper will explore the effects surface carburization, or carbon diffused surface hardening, has on the resistance of thread galling for B8M Class 1, B8M Class 2, and Hastelloy® C-276 fasteners.3 With the data provided from this initial study, a better understanding of the benefits low temperature carbon diffusion treated fasteners provides will be obtained. This paper has a limited scope that will utilize hand torqueing at various percentages of bolt yield to analyze the resultant clamping force of carburized fasteners in comparison to that of standard fasteners. This study is a milestone to further clarify the thread galling resistance that carburized fasteners provides.

scholarly journals Effect of ultrasonic surface deep rolling combined with oxygen boost diffusion treatment on fatigue properties of pure titanium

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xue-Fei Teng ◽  
Yun-Fei Jia ◽  
Cong-Yang Gong ◽  
Cheng-Cheng Zhang ◽  
Xian-Cheng Zhang ◽  
...  
Keyword(s):  
Diffusion Zone ◽  
Oxygen Diffusion ◽  
Surface Hardening ◽  
Pure Titanium ◽  
Fatigue Properties ◽  
Fracture Mechanisms ◽  
Deep Rolling ◽  
Refined Grains ◽  
Diffusion Treatment ◽  
Deformation Area

AbstractUltrasonic surface deep rolling (USDR), oxygen boost diffusion (OBD), and their combination (USDR-OBD) were all used to improve the surface hardening of pure titanium. The microstructure, microhardness, and fatigue life of pure titanium treated by USDR, OBD, and USDR-OBD methods were analyzed. USDR treatment induced a severe deformation area, while OBD treatment produced a brittle oxygen diffusion zone. The USDR-OBD treated samples approached the highest hardness in comparison with other treated samples. The fatigue lives of USDR treated samples were improved, which was due to the high compressive residual stress and refined grains. However, the fatigue lives of both OBD treated samples and USDR-OBD treated samples were decreased due to premature crack initiation and rapid propagation in the oxygen diffusion zone. Finally, the fatigue fracture mechanisms of different samples were proposed.

Surface hardening of Ti – 6Al – 4V alloy by diffusion treatment of electroless Ni – B coatings

2004 ◽  
Vol 20 (2) ◽  
pp. 103-107 ◽  
Author(s):  
M. Dabalà ◽  
K. Brunelli ◽  
R. Frattini ◽  
M. Magrini
Keyword(s):  
Surface Hardening ◽  
Diffusion Treatment ◽  
Electroless Ni

A study of interface sliding at F.C.C.-B.C.C. boundaries in a Cu-Zn alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 422-423
Author(s):  
F. Monchoux ◽  
A. Rocher ◽  
J.L. Martin
Keyword(s):  
Face Centered Cubic ◽  
Creep Tests ◽  
High Voltage Electron Microscopy ◽  
Diffusion Treatment ◽  
Voltage Electron ◽  
The Face ◽  
Face Centered ◽  
Interface Sliding ◽  
Zn Alloy ◽  
Made In

Interphase sliding is an important phenomenon of high temperature plasticity. In order to study the microstructural changes associated with it, as well as its influence on the strain rate dependence on stress and temperature, plane boundaries were obtained by welding together two polycrystals of Cu-Zn alloys having the face centered cubic and body centered cubic structures respectively following the procedure described in (1). These specimens were then deformed in shear along the interface on a creep machine (2) at the same temperature as that of the diffusion treatment so as to avoid any precipitation. The present paper reports observations by conventional and high voltage electron microscopy of the microstructure of both phases, in the vicinity of the phase boundary, after different creep tests corresponding to various deformation conditions.Foils were cut by spark machining out of the bulk samples, 0.2 mm thick. They were then electropolished down to 0.1 mm, after which a hole with thin edges was made in an area including the boundary

The Heat and Diffusion Treatment of Natural and Synthetic Sapphires

1981 ◽  
Vol 17 (8) ◽  
pp. 528-541 ◽  
Author(s):  
Robert Crowningshield ◽  
Kurt Nassau
Keyword(s):  
Diffusion Treatment ◽  
And Diffusion ◽  
Natural And Synthetic

Sapphire diffusion treatment and the behaviour of iron and titanium

2005 ◽  
Vol 29 (7) ◽  
pp. 455-460
Author(s):  
Yang Ruzeng ◽  
Yang Yuan ◽  
Xu Hongyi
Keyword(s):  
Diffusion Treatment

Effect of increased temperatures on structures of titanium VT22 alloy strengthened by electromechanical processing

2020 ◽  
pp. 376-379
Author(s):  
S.A. Yakovlev ◽  
M.M. Zamal’dinov ◽  
A.A. Glushchenko ◽  
I.R. Salakhutdinov
Keyword(s):  
Titanium Alloys ◽  
Heating Temperature ◽  
Alloy Vt22 ◽  
Vt22 Alloy ◽  
Machine Parts ◽  
Operational Modes

The hardening methods of titanium alloys are analyzed. Effect of heating temperature on resistance of VT22 alloy structures strengthened by electromechanical processing is defined. Results of change in hardness of the strengthened structures depending on heating temperature are presented. Recommendations on the operational modes of machine parts made of alloy VT22 strengthened by electromechanical processing are provided.

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.

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