TY - JOUR
T1 - Effects of combined plasma chromizing and shot peening on the fatigue properties of a Ti6Al4V alloy
AU - Yu, Shouming
AU - Liu, Daoxin
AU - Zhang, Xiaohua
AU - Du, Dongxing
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/10/30
Y1 - 2015/10/30
N2 - A plasma chromizing treatment was conducted on Ti6Al4V samples by employing the recently developed double glow plasma surface alloying technology. The Cr-Alloyed layer consisted of four sub-layers, namely the Cr deposition, Cr 2 Ti, CrTi 4 , and Cr-Ti solid-solution layers. The local hardness and moduli were determined via nanoindentation. In addition, the fatigue properties of the samples were evaluated by using a rotating-bending fatigue machine under a given load. The results showed that the hardness or elastic moduli of the adjacent sub-layers differed significantly and the fatigue properties of the Ti6Al4V alloy deteriorated with the plasma chromizing treatment. This deterioration stemmed mainly from cracks initiated at the interfaces between the sub-layers and the microstructural changes of the substrate; these changes were induced by the high temperature used in the plasma chromizing process. However, the fatigue life of the plasma-chromized samples was increased by a shot peening post-treatment. The fatigue life of the samples resulting from this combination of treatments was slightly higher than that of the single-shot-peened Ti6Al4V substrate. In fact, the sample retaining only the Cr-Ti solid-solution layer (that is, the first three sub-layers were removed), when shot-peened, exhibited the highest fatigue life among all the tested samples; this was attributed to that sample having the highest residual compressive stress, the significant work hardening, and the good hardness to toughness balance.
AB - A plasma chromizing treatment was conducted on Ti6Al4V samples by employing the recently developed double glow plasma surface alloying technology. The Cr-Alloyed layer consisted of four sub-layers, namely the Cr deposition, Cr 2 Ti, CrTi 4 , and Cr-Ti solid-solution layers. The local hardness and moduli were determined via nanoindentation. In addition, the fatigue properties of the samples were evaluated by using a rotating-bending fatigue machine under a given load. The results showed that the hardness or elastic moduli of the adjacent sub-layers differed significantly and the fatigue properties of the Ti6Al4V alloy deteriorated with the plasma chromizing treatment. This deterioration stemmed mainly from cracks initiated at the interfaces between the sub-layers and the microstructural changes of the substrate; these changes were induced by the high temperature used in the plasma chromizing process. However, the fatigue life of the plasma-chromized samples was increased by a shot peening post-treatment. The fatigue life of the samples resulting from this combination of treatments was slightly higher than that of the single-shot-peened Ti6Al4V substrate. In fact, the sample retaining only the Cr-Ti solid-solution layer (that is, the first three sub-layers were removed), when shot-peened, exhibited the highest fatigue life among all the tested samples; this was attributed to that sample having the highest residual compressive stress, the significant work hardening, and the good hardness to toughness balance.
KW - Plasma chromizing
KW - Residual stress
KW - Rotating-bending fatigue
KW - Shot peening
KW - Ti6Al4V
UR - http://www.scopus.com/inward/record.url?scp=84941964792&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2015.07.038
DO - 10.1016/j.apsusc.2015.07.038
M3 - 文章
AN - SCOPUS:84941964792
SN - 0169-4332
VL - 353
SP - 995
EP - 1002
JO - Applied Surface Science
JF - Applied Surface Science
ER -