Thermodynamics and kinetics of gas nitriding alpha-iron alloys

Dissertation

Raimo Pulkkinen

Research output: ThesisDissertationCollection of Articles

Abstract

The current knowledge of the mechanisms of gas nitriding bcc iron alloys was surveyed.Alloys studied in the experimental work were unalloyed and chromium-, molybdenum- and silicon-alloyed -irons.The effects of the surface phases and alloying elements on the kinetics of nitrogenation of -iron were presented.The reasons for the formation of surface iron nitrides under apparently thermodynamically unfeasible conditions were explained.The effect of alloying elements on the distribution of the nitride formation at the iron surface and the effect of alloying elements of grain boundary segregation in bright nitrided -irons were studied.Also the effect of chromium, molybdenum and silicon as alloying elements on the activity coefficient of nitrogen in -iron was presented.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Supervisors/Advisors
  • Sulonen, Martti, Supervisor, External person
Award date3 Mar 1984
Place of PublicationEspoo
Publisher
Print ISBNs951-38-1962-0
Publication statusPublished - 1984
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

iron alloys
nitriding
iron
thermodynamics
alloying
kinetics
gases
molybdenum
nitrides
chromium
nitrogenation
silicon
grain boundaries
nitrogen
coefficients

Keywords

  • nitriding, thermodynamics, kinetics, iron alloys

Cite this

Pulkkinen, R. (1984). Thermodynamics and kinetics of gas nitriding alpha-iron alloys: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Pulkkinen, Raimo. / Thermodynamics and kinetics of gas nitriding alpha-iron alloys : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1984. 46 p.
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abstract = "The current knowledge of the mechanisms of gas nitriding bcc iron alloys was surveyed.Alloys studied in the experimental work were unalloyed and chromium-, molybdenum- and silicon-alloyed -irons.The effects of the surface phases and alloying elements on the kinetics of nitrogenation of -iron were presented.The reasons for the formation of surface iron nitrides under apparently thermodynamically unfeasible conditions were explained.The effect of alloying elements on the distribution of the nitride formation at the iron surface and the effect of alloying elements of grain boundary segregation in bright nitrided -irons were studied.Also the effect of chromium, molybdenum and silicon as alloying elements on the activity coefficient of nitrogen in -iron was presented.",
keywords = "nitriding, thermodynamics, kinetics, iron alloys",
author = "Raimo Pulkkinen",
year = "1984",
language = "English",
isbn = "951-38-1962-0",
series = "Publications / Technical Research Centre of Finland",
publisher = "VTT Technical Research Centre of Finland",
number = "15",
address = "Finland",
school = "Helsinki University of Technology",

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Pulkkinen, R 1984, 'Thermodynamics and kinetics of gas nitriding alpha-iron alloys: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

Thermodynamics and kinetics of gas nitriding alpha-iron alloys : Dissertation. / Pulkkinen, Raimo.

Espoo : VTT Technical Research Centre of Finland, 1984. 46 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Thermodynamics and kinetics of gas nitriding alpha-iron alloys

T2 - Dissertation

AU - Pulkkinen, Raimo

PY - 1984

Y1 - 1984

N2 - The current knowledge of the mechanisms of gas nitriding bcc iron alloys was surveyed.Alloys studied in the experimental work were unalloyed and chromium-, molybdenum- and silicon-alloyed -irons.The effects of the surface phases and alloying elements on the kinetics of nitrogenation of -iron were presented.The reasons for the formation of surface iron nitrides under apparently thermodynamically unfeasible conditions were explained.The effect of alloying elements on the distribution of the nitride formation at the iron surface and the effect of alloying elements of grain boundary segregation in bright nitrided -irons were studied.Also the effect of chromium, molybdenum and silicon as alloying elements on the activity coefficient of nitrogen in -iron was presented.

AB - The current knowledge of the mechanisms of gas nitriding bcc iron alloys was surveyed.Alloys studied in the experimental work were unalloyed and chromium-, molybdenum- and silicon-alloyed -irons.The effects of the surface phases and alloying elements on the kinetics of nitrogenation of -iron were presented.The reasons for the formation of surface iron nitrides under apparently thermodynamically unfeasible conditions were explained.The effect of alloying elements on the distribution of the nitride formation at the iron surface and the effect of alloying elements of grain boundary segregation in bright nitrided -irons were studied.Also the effect of chromium, molybdenum and silicon as alloying elements on the activity coefficient of nitrogen in -iron was presented.

KW - nitriding, thermodynamics, kinetics, iron alloys

M3 - Dissertation

SN - 951-38-1962-0

T3 - Publications / Technical Research Centre of Finland

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Pulkkinen R. Thermodynamics and kinetics of gas nitriding alpha-iron alloys: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1984. 46 p.