Partial laser and gas nitriding of titanium components

2009 ◽  
Vol 64 (5) ◽  
pp. 270-277 ◽  
Author(s):  
A. Schütz ◽  
D. Müller ◽  
P. Reichert ◽  
U. Glatzel
Keyword(s):  
Gas Nitriding

White Layer Control on AISI 316L Using Temperature and Gas Nitriding Diffusion Stage Process

2017 ◽  
Vol 11 (8) ◽  
pp. 613
Author(s):  
Komang Astana Widi ◽  
Wardana Wardana ◽  
Wahyono Suprapto ◽  
Yudy Surya Irawan
Keyword(s):  
White Layer ◽  
Aisi 316L ◽  
Gas Nitriding ◽  
Diffusion Stage ◽  
Stage Process ◽  
Layer Control

Effect of gas nitriding in flowing ammonia on the hot-dip galvanising of the Dual-Phase steel DP500

2005 ◽  
Vol 96 (3) ◽  
pp. 233-241 ◽  
Author(s):  
A. Dimyati ◽  
D. Beste ◽  
T. E. Weirich ◽  
S. Richter ◽  
M. Bückins ◽  
...  
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Gas Nitriding

scholarly journals Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 698
Author(s):  
Kateryna Kostyk ◽  
Michal Hatala ◽  
Viktoriia Kostyk ◽  
Vitalii Ivanov ◽  
Ivan Pavlenko ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Temperature Distribution ◽  
Thermal Treatment ◽  
Diffusion Processes ◽  
Nitrogen Concentration ◽  
The Body ◽  
Functional Dependencies ◽  
Technological Parameters ◽  
Gas Nitriding ◽  
Temperature State

To solve a number of technological issues, it is advisable to use mathematical modeling, which will allow us to obtain the dependences of the influence of the technological parameters of chemical and thermal treatment processes on forming the depth of the diffusion layers of steels and alloys. The paper presents mathematical modeling of diffusion processes based on the existing chemical and thermal treatment of steel parts. Mathematical modeling is considered on the example of 38Cr2MoAl steel after gas nitriding. The gas nitriding technology was carried out at different temperatures for a duration of 20, 50, and 80 h in the SSHAM-12.12/7 electric furnace. When modeling the diffusion processes of surface hardening of parts in general, providing a specifically given distribution of nitrogen concentration over the diffusion layer’s depth from the product’s surface was solved. The model of the diffusion stage is used under the following assumptions: The diffusion coefficient of the saturating element primarily depends on temperature changes; the metal surface is instantly saturated to equilibrium concentrations with the saturating atmosphere; the surface layer and the entire product are heated unevenly, that is, the product temperature is a function of time and coordinates. Having satisfied the limit, initial, and boundary conditions, the temperature distribution equations over the diffusion layer’s depth were obtained. The final determination of the temperature was solved by an iterative method. Mathematical modeling allowed us to get functional dependencies for calculating the temperature distribution over the depth of the layer and studying the influence of various factors on the body’s temperature state of the body.

scholarly journals (Ti,Al)O2 Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2658
Author(s):  
Krzysztof Szymkiewicz ◽  
Jerzy Morgiel ◽  
Łukasz Maj ◽  
Małgorzata Pomorska
Keyword(s):  
Surface Hardening ◽  
Surface Defects ◽  
Plasma Nitriding ◽  
Surface Roughening ◽  
Effective Surface ◽  
Plan View ◽  
Gas Nitriding ◽  
Transmission Electron ◽  
Temperature Window ◽  
20 Nm

Plasma nitriding of titanium alloys is capable of effective surface hardening at temperatures significantly lower than gas nitriding, but at a cost of much stronger surface roughening. Especially interesting are treatments performed at the lower end of the temperature window used in such cases, as they are least damaging to highly polished parts. Therefore identifying the most characteristic defects is of high importance. The present work was aimed at identifying the nature of pin-point bumps formed at the glow discharged plasma nitrided Ti-6Al-7Nb alloy using plan-view scanning and cross-section transmission electron microscopy methods. It helped to establish that these main surface defects developed at the treated surface are (Ti,Al)O2 nano-whiskers of diameter from 20 nm to 40 nm, and length up to several hundreds of nanometers. The performed investigation confirmed that the surface imperfection introduced by plasma nitriding at the specified range should be of minor consequences to the mechanical properties of the treated material.

Effect of elemental doping on the catalytic activity of ABO3 perovskite oxides during low-pressure gas nitriding

2021 ◽  
Vol 542 ◽  
pp. 148706
Author(s):  
Chengsong Zhang ◽  
Yun Wang ◽  
Dazhi Chen ◽  
Yeqiong Wu ◽  
Guodong Cui ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Pressure ◽  
Perovskite Oxides ◽  
Gas Nitriding ◽  
Abo3 Perovskite ◽  
Elemental Doping

scholarly journals Role of Grain Boundaries in diffusional Phenomena during Gas Nitriding of Pure Iron

2011 ◽  
Vol 10 ◽  
pp. 2943-2948 ◽  
Author(s):  
S. Fare ◽  
N. Lecis ◽  
E. Brescia ◽  
M. Mazzola
Keyword(s):  
Grain Boundaries ◽  
Pure Iron ◽  
Gas Nitriding

Sealing of gas nitriding furnaces

1969 ◽  
Vol 11 (9) ◽  
pp. 723-725
Author(s):  
Ya. I. Matin
Keyword(s):  
Gas Nitriding
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