TY - GEN
T1 - Fatigue properties of pre-FPP (Fine Particle Peening) treated and gas Nitrided austenitic stainless steel
AU - Kikuchi, S.
AU - Nakahara, Y.
AU - Komotori, J.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - The nitrided layer is extremely thin due to the existence of a passive film at the surface of austenitic stainless steel. In order to accelerate the diffusion of nitrogen into the material, a fine particle peening (FPP) treatment was introduced prior to gas nitriding (pre-FPP treatment). The effects of pre-FPP treatment on gas nitriding behavior and fatigue properties of AISI 316 steel were evaluated. Surface microstructures of the pre-FPP treated specimens were characterized using a micro-Vickers hardness tester, scanning electron microscope (SEM), optical microscope, electron probe micro analyzer (EPMA) and X-ray diffraction (XRD). The pre-FPP treatment generated the local stratification pattern which has high dislocation densities. Therefore, nitrogen diffused into this unique structure, resulting in an increase of the surface hardness. Fatigue tests were conducted at room temperature using a rotational bending fatigue testing machine. The pre-FPP treated specimen showed the highest fatigue strength. After fatigue tests, fracture surfaces were observed using an SEM in order to investigate the high cycle fatigue properties.
AB - The nitrided layer is extremely thin due to the existence of a passive film at the surface of austenitic stainless steel. In order to accelerate the diffusion of nitrogen into the material, a fine particle peening (FPP) treatment was introduced prior to gas nitriding (pre-FPP treatment). The effects of pre-FPP treatment on gas nitriding behavior and fatigue properties of AISI 316 steel were evaluated. Surface microstructures of the pre-FPP treated specimens were characterized using a micro-Vickers hardness tester, scanning electron microscope (SEM), optical microscope, electron probe micro analyzer (EPMA) and X-ray diffraction (XRD). The pre-FPP treatment generated the local stratification pattern which has high dislocation densities. Therefore, nitrogen diffused into this unique structure, resulting in an increase of the surface hardness. Fatigue tests were conducted at room temperature using a rotational bending fatigue testing machine. The pre-FPP treated specimen showed the highest fatigue strength. After fatigue tests, fracture surfaces were observed using an SEM in order to investigate the high cycle fatigue properties.
KW - Austenitic stainless steel
KW - Fatigue
KW - Nitriding
KW - Shot peening
UR - http://www.scopus.com/inward/record.url?scp=63749114643&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=63749114643&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:63749114643
SN - 9781605606217
T3 - Materials Science and Technology Conference and Exhibition, MS and T'08
SP - 741
EP - 752
BT - Materials Science and Technology Conference and Exhibition MS and T'08
T2 - Materials Science and Technology Conference and Exhibition, MS and T'08
Y2 - 5 October 2008 through 9 October 2008
ER -