TY - JOUR
T1 - A plastic strain energy method exploration between machined surface integrity evolution and torsion fatigue behaviour of low alloy steel
AU - WANG, Yong
AU - WANG, Xibin
AU - LIU, Zhibing
AU - LIU, Shuyao
AU - WANG, Sitao
AU - CHEN, Hongtao
AU - SONG, Ci
AU - BAI, Yifan
AU - WANG, Pai
AU - LIU, Yang
N1 - Publisher Copyright:
© 2021 Chinese Society of Aeronautics and Astronautics
PY - 2022
Y1 - 2022
N2 - To explore the evolution mechanism of multistage machining processes and torsional fatigue behaviour based on strain energy for the first time and provide process optimization of axis parts of low alloy steel for service performance, four multistage machining processes were applied to the 45CrNiMoVA steel, including the Rough Turning process (RT), RT+ the Finish Turning process (FRT), FRT+ the Grinding process (GFRT) and RT+ the Finish Turning process on dry cutting condition (FRT0). The result showed that the FRT process's average low-cycle torsional fatigue life increased by 50% when it evolved from the RT process. The lower surface roughness of Ra 1.3 μm caused the total strain energy to increase by 163.8 Pa mm/mm instead of the unchanged strain energy density, and the crack feature evolved from some specific bulges to flat shear plane characteristics. When the GFRT process evolved from the FRT process, its average fatigue life increased by 1.45 times, compared with the RT process. Plastic strain amplitude decreased by 21%, and the strain energy density decreased by 4% due to more considerable compressive residual stress (−249 MPa). Plastic deformation layer depth had a consistent tendency with surface roughness. In this paper, surface integrity evolutions on cyclic characteristics and fatigue behaviour have also been explained. A fatigue life prediction model based on the energy method for machined surface integrity is proposed.
AB - To explore the evolution mechanism of multistage machining processes and torsional fatigue behaviour based on strain energy for the first time and provide process optimization of axis parts of low alloy steel for service performance, four multistage machining processes were applied to the 45CrNiMoVA steel, including the Rough Turning process (RT), RT+ the Finish Turning process (FRT), FRT+ the Grinding process (GFRT) and RT+ the Finish Turning process on dry cutting condition (FRT0). The result showed that the FRT process's average low-cycle torsional fatigue life increased by 50% when it evolved from the RT process. The lower surface roughness of Ra 1.3 μm caused the total strain energy to increase by 163.8 Pa mm/mm instead of the unchanged strain energy density, and the crack feature evolved from some specific bulges to flat shear plane characteristics. When the GFRT process evolved from the FRT process, its average fatigue life increased by 1.45 times, compared with the RT process. Plastic strain amplitude decreased by 21%, and the strain energy density decreased by 4% due to more considerable compressive residual stress (−249 MPa). Plastic deformation layer depth had a consistent tendency with surface roughness. In this paper, surface integrity evolutions on cyclic characteristics and fatigue behaviour have also been explained. A fatigue life prediction model based on the energy method for machined surface integrity is proposed.
KW - Cyclic hysteresis loop
KW - Multistage machining processes
KW - Strain energy
KW - Surface integrity evolution
KW - Torsional fatigue
UR - http://www.scopus.com/inward/record.url?scp=85135922737&partnerID=8YFLogxK
U2 - 10.1016/j.cja.2021.11.003
DO - 10.1016/j.cja.2021.11.003
M3 - Article
AN - SCOPUS:85135922737
SN - 1000-9361
JO - Chinese Journal of Aeronautics
JF - Chinese Journal of Aeronautics
ER -