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(A Study on Fatigue Property of High Strength Steels in Ultra-Wide Life R\
egion under)Tj
14.582 -1.211 Td
(Rotating Bending)Tj
/TT1 1 Tf
12 0 0 12 476.3535 742.5 Tm
(Mitsuhiro Takeda)Tj
-35.988 -2.313 Td
(Due to strict economical circumstances in the industrial society, wide v\
ariety of mechanical structures have)Tj
-1 -1.5 Td
(been used in a long period, sometimes, beyond the design life provided i\
n advance. Based on the trend to)Tj
0 -1.5 TD
(require the high quality and down sizing of mechanical structures, vario\
us high strength steels have been)Tj
T*
(developed and applied to the actual uses. Usually, high strength steels \
and surface-hardened steels have a)Tj
T*
(significant fatigue property such that the )Tj
/TT2 1 Tf
16.439 0 Td
(S-N)Tj
/TT1 1 Tf
( curve tends to come down again in the long life region of)Tj
/TT2 1 Tf
-16.439 -1.562 Td
(N)Tj
/C0_0 1 Tf
<02BC>Tj
/TT1 1 Tf
(10)Tj
8.25 0 0 8.25 64.5039 625.5 Tm
(7)Tj
12 0 0 12 68.6289 624 Tm
(. Thus the fatigue property of metallic materials in the long life regim\
e tends to be an important)Tj
-3.011 -1.5 Td
(subject in the mechanical design to ensure the long-term safety of the m\
echanical structures.)Tj
1 -2.563 Td
(From this point of view, fatigue tests in the ultra-wide life region of \
)Tj
/TT2 1 Tf
27.328 0 Td
(N)Tj
/TT1 1 Tf
(=0.5)Tj
/C0_0 1 Tf
<0299>Tj
/TT1 1 Tf
(10)Tj
8.25 0 0 8.25 426.2031 576.75 Tm
(9)Tj
12 0 0 12 430.3281 575.25 Tm
( were performed for the)Tj
-33.152 -1.5 Td
(following kinds of high strength steels;)Tj
2.5 -2.313 Td
(Several high strength steels for mechanical tool use \(SWRH62A, SVS, SRS\
60D\))Tj
0 -1.125 TD
(High carbon chromium bearing steel \(JIS:SUJ2\))Tj
T*
(Nickel chromium molybdenum steel \(JIS:SNCM439\))Tj
-2.5 -2.125 Td
(In addition, fracture surface of each specimen was observed by SEM and d\
iscussions were made from a)Tj
T*
(viewpoint of fractography. Furthermore, in order to clarify the effect o\
f strength level on fatigue property, )Tj
/TT2 1 Tf
42.624 0 Td
(S-N)Tj
/TT1 1 Tf
-42.624 -1.125 Td
(properties of the above high strength steels and carbon steel for machin\
e structural use \(JIS: S35C\) with low)Tj
T*
(strength were compared with one another.)Tj
1 -2.313 Td
(It was found that the significant )Tj
/TT2 1 Tf
12.941 0 Td
(S-N)Tj
/TT1 1 Tf
( property for high strength steels is well explained as "Duplex )Tj
/TT2 1 Tf
26.486 0 Td
(S-N)Tj
/TT1 1 Tf
-40.427 -1.5 Td
(property" given by superposition of )Tj
/TT2 1 Tf
14.489 0 Td
(S-N)Tj
/TT1 1 Tf
( curves for surface induced fracture and interior inclusion induced)Tj
-14.489 -1.5 Td
(fracture. However, the )Tj
/TT2 1 Tf
9.245 0 Td
(S-N)Tj
/TT1 1 Tf
( property of S35C steel with low strength has no longer such an aspect, \
and it is)Tj
-9.245 -1.5 Td
(given as " a simple )Tj
/TT2 1 Tf
7.823 0 Td
(S-N)Tj
/TT1 1 Tf
( property" only for the surface induced fracture. Thus the latter fractu\
re mode is)Tj
-7.823 -1.5 Td
(predominant for high strength steels. Another finding in this mode is a \
fact that a clear fish-eye inscribed in)Tj
0 -1.5 TD
(the specimen surface is usually observed and an inclusion is found at th\
e center of the fish-eye. It was finally)Tj
T*
(clarified that the fine granular area \(FGA\) is formed in the vicinity \
around the inclusion and the nucleation)Tj
T*
(process of this area plays an important role to determine the fatigue li\
fe of the material.)Tj
ET
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