Hydrogen Effect on Strength and Plasticity of Steels After Ion Nitriding in Hydrogen and Hydrogen-Free Environments

The authors present the results of experimental investigations of strength and plasticity characteristics, as well as fracture nature, of the specimens of different steels under tension after ion nitriding in hydrogen (nitrogen with hydrogen) and hydrogen-free (nitrogen with argon) environments. The...

Full description

Saved in:
Bibliographic Details
Published in:Strength of materials 2020-05, Vol.52 (3), p.407-413
Main Authors: Kaplun, P. V., Lyashenko, B. A.
Format: Article
Language:English
Subjects:
Alloying
Argon
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Elongation
Heat treatment
High alloy steels
Hydrogen
Hydrogen embrittlement
Ion nitriding
Low alloy steels
Materials Science
Mechanical properties
Microcracks
Nitrides
Plastic properties
Solid Mechanics
Steel
Stress-strain curves
Stress-strain relationships
Tensile strength
Tensile stress
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The authors present the results of experimental investigations of strength and plasticity characteristics, as well as fracture nature, of the specimens of different steels under tension after ion nitriding in hydrogen (nitrogen with hydrogen) and hydrogen-free (nitrogen with argon) environments. The obtained characteristics are compared with those before nitriding. It is established that during ion nitriding in the hydrogen-free environment, tensile strength of the specimens has increased by 4–11%, whereas relative elongation and contraction have decreased by 1.1–3 times based on the nitriding mode and steel type. The authors have built the tensile stress-strain diagram for the specimens made of steel St3, 40Kh, and 12Kh18N10T without chemical and thermal treatment, ion nitriding in the hydrogen and hydrogen-free environments. The influence of hydrogen concentration in the saturation environment on the strength and plasticity characteristics has been defined. Under concentrations higher than 10 vol.% there is embrittlement with the decrease of strength characteristics (to 15%) and a significant decrease of plasticity (to 40%) for low-alloyed steels. For high-alloyed steels, the negative influence of hydrogen on the strength characteristics does not increase by 3%, while the influence on the plasticity characteristics – by 8%. The authors have investigated the initiation and propagation of microcracks under external loading on the steel with nitride layers.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-020-00191-w