Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet
AbstractMost structural components undertake cyclic loads in engineering and failures always cause catastrophic economic losses and casualties. In the present work, the phase evolution of Al-Si coating of high-strength boron steel during hot stamping was investigated. Two types of 1500 MPa grade boron steel sheets, one with Al-Si coating and the other without, were studied to reveal the effect on the high-cycle fatigue behavior. The as-received continuously hot-dip Al-Si coating was composed of α(Al), eutectic Al-Si and τ5. After hot stamping at 1193 K, three phases formed in this coating: β2, Fe(Al,Si)2 and α(Fe). The experimental results showed that the endurance limit of the coated steel sheet was 370 MPa under 107 fully reversed tension-compression loading cycles as opposed to 305 MPa in the uncoated sheet. Both the coated and the uncoated specimens showed surface-induced transgranular fatigue fractures. In the uncoated sheet, the fatigue cracks were generated from the decarburization surface, but the Al-Si coating effectively prevented the occurrence of near-surface decarburization during high-temperature hot stamping, and the only cracks in the coated steel sheet were initiated at wire-cutting surfaces. View Full-Text
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Li, Y.; Tan, N.; Xu, Z.; Luo, Z.; Han, K.; Zhai, Q.; Zheng, H. Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet. Metals 2019, 9, 722.
Li Y, Tan N, Xu Z, Luo Z, Han K, Zhai Q, Zheng H. Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet. Metals. 2019; 9(7):722.Chicago/Turabian Style
Li, Yuqiang; Tan, Ning; Xu, Zhishuai; Luo, Zhiping; Han, Ke; Zhai, Qijie; Zheng, Hongxing. 2019. "Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet." Metals 9, no. 7: 722.
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