Effect Of Surface Carbonitriding By Plasma
Immersion Ion Implantation On The Fatigue
Behaviour Of 316L Austenitic Stainless Steel
Author(s)
K. Obrtlík, Y. Jirásková, J. Man & J. Polák
Abstract
Cylindrical specimens of 316L austenitic stainless steel in an as-received
condition and with surface carbonitriding by plasma immersion ion implantation
were cyclically strained under plastic strain control. The micro-hardness depth
profile of the hardened surface layer was measured. Mössbauer spectroscopy and
X-ray diffraction were used to study the phase composition of the treated layer.
The stress-strain response and fatigue life data of both materials were obtained.
The surface relief and fracture surfaces were examined to study fatigue damage
mechanisms. Two domains separated by the transitional plastic strain amplitude
could be distinguished in the fatigue behaviour of the treated steel. In the low
amplitude domain, the main crack originates in the subsurface region resulting in
a prolonged lifetime. In the high amplitude domain, the main crack initiates at
the surface and the fatigue life of the treated steel is reduced compared to the
untreated one.
Keywords: austenitic stainless steel, surface carbonitriding, fatigue life curves,
stress-strain response, plasma immersion ion implantation, crack initiation.
1 Introduction
Plasma immersion ion implantation is one of advanced methods of plasma
engineering. This is a non-line-of-sight technique for the surface modification of
industrial components, offering several inherent advantages over conventional
beam-line ion implantation (Wei et al. [1]). One of the key advantages is the
capability to treat efficiently irregular-shaped specimens without complex
specimen or ion beam manipulation. The nitrogen and/or carbon ions to be
Keywords
austenitic stainless steel, surface carbonitriding, fatigue life curves,
stress-strain response, plasma immersion ion implantation, crack initiation.
Related Book
Other papers in this volume
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