TY - JOUR
T1 - Temperature dependence of transgranular fatigue crack resistance in interstitial-free steel and Fe-C steels with supersaturated carbon
T2 - Effects of dynamic strain aging and dynamic precipitation
AU - Li, Bochuan
AU - Koyama, Motomichi
AU - Sakurada, Eisaku
AU - Yoshimura, Nobuyuki
AU - Ushioda, Kohsaku
AU - Noguchi, Hiroshi
N1 - Funding Information:
This work was financially supported by JSPS KAKENHI (JP16H06365), China Scholarship Council (CSC No. 201406130074 ).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/5
Y1 - 2018/5
N2 - Tension tests at different temperatures were conducted for two ferritic steels: Fe-0.017C with 0.017% solute carbon content and interstitial-free (IF) steels. It is verified the occurrence of dynamic strain aging (DSA) in Fe-0.017C at high temperatures. Tension tests for the Fe-0.017C, following corresponding heating treatments, demonstrated the transition process of dynamic precipitation from under-aging to over-aging. Moreover, the threshold stress intensity factor ranges (ΔKth) of a small crack for these two steels both decrease with temperature growth. However, the ΔKth of Fe-0.017C was always larger than that of IF steel owing to solid solution hardening and DSA at 293 and 333 K and roughness-induced crack closure and precipitation hardening at 433 K.
AB - Tension tests at different temperatures were conducted for two ferritic steels: Fe-0.017C with 0.017% solute carbon content and interstitial-free (IF) steels. It is verified the occurrence of dynamic strain aging (DSA) in Fe-0.017C at high temperatures. Tension tests for the Fe-0.017C, following corresponding heating treatments, demonstrated the transition process of dynamic precipitation from under-aging to over-aging. Moreover, the threshold stress intensity factor ranges (ΔKth) of a small crack for these two steels both decrease with temperature growth. However, the ΔKth of Fe-0.017C was always larger than that of IF steel owing to solid solution hardening and DSA at 293 and 333 K and roughness-induced crack closure and precipitation hardening at 433 K.
KW - Dynamic precipitation
KW - Dynamic strain aging
KW - Interstitial solute carbon
KW - Roughness-induced crack closure
KW - Threshold stress intensity factor ranges
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U2 - 10.1016/j.ijfatigue.2018.01.003
DO - 10.1016/j.ijfatigue.2018.01.003
M3 - Article
AN - SCOPUS:85041460168
VL - 110
SP - 1
EP - 9
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -