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RISS 인기검색어
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- 저자 : Fangce Liu (검색결과 2 건)
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Aging Hardening and Precipitation Characteristics of Extruded Mg–9Al–0.8Zn–0.2Mn–0.3Ca–0.2Y Alloy
Fangce Liu,Yue Bi,Chao Wang,Jian Kang,Tong He,Yandong Liu,Guo Yuan 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
In this paper, high temperature hot rolling and weld simulations were performed in Al-killed and Ti-Zr-killed steels. Themicrostructure and impact toughness of the heat-affected zone (HAZ) of the two experimental steels were investigated, andthe ferrite transformation behavior in HAZ was also observed. The characteristic inclusions in the Ti-Zr-killed steel werestudied using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD). The results suggested thatthe HAZ microstructure of the Al-killed steel consisted of coarse bainite ferrite (BF) and granular bainite (GB) packets. TheHAZ microstructure of Ti-Zr-killed steel was significantly refined and mainly contained fine acicular ferrite (AF) and BF. TheTi-Zr-O + MnS inclusions were 0.3–2.1 μm and could effectively promote the formation of AF after the weld simulations. MnS had a specific orientation relationship: {111}MnS║{0001}Ti-Zr-O, < 110 > MnS║ < 2 −1−1 0 > Ti-Zr-O with Ti-Zr-O inclusion,and its precipitation promoted the formation of the Mn-depleted zone (MDZ). AF formed around it. The formation of aninterlocked AF structure in the HAZ of the Ti-Zr-killed steel obviously increased the proportion of high angle grain boundaries(HAGBs) and refined the average effective grain size of the HAZ microstructure. Consequently, the impact toughnessof the Ti-Zr-killed steel had no deterioration, but the impact toughness of Al-killed steel had an obvious loss after the weldsimulation with a heat input of 70 kJ/cm. The impact absorption energy of HAZ of Ti-Zr-killed steel was improved from 6to 219 J compared to Al-killed steel.
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Fangce Liu,Yue Bi,Chao Wang,Jian Kang,Tong He,Yandong Liu,Guo Yuan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
In this paper, high temperature hot rolling and weld simulations were performed in Al-killed and Ti-Zr-killed steels. Themicrostructure and impact toughness of the heat-affected zone (HAZ) of the two experimental steels were investigated, andthe ferrite transformation behavior in HAZ was also observed. The characteristic inclusions in the Ti-Zr-killed steel werestudied using electron probe microanalysis (EPMA) and electron backscatter diffraction (EBSD). The results suggested thatthe HAZ microstructure of the Al-killed steel consisted of coarse bainite ferrite (BF) and granular bainite (GB) packets. TheHAZ microstructure of Ti-Zr-killed steel was significantly refined and mainly contained fine acicular ferrite (AF) and BF. TheTi-Zr-O + MnS inclusions were 0.3–2.1 μm and could effectively promote the formation of AF after the weld simulations. MnS had a specific orientation relationship: {111}MnS║{0001}Ti-Zr-O, < 110 > MnS║ < 2 −1−1 0 > Ti-Zr-O with Ti-Zr-O inclusion,and its precipitation promoted the formation of the Mn-depleted zone (MDZ). AF formed around it. The formation of aninterlocked AF structure in the HAZ of the Ti-Zr-killed steel obviously increased the proportion of high angle grain boundaries(HAGBs) and refined the average effective grain size of the HAZ microstructure. Consequently, the impact toughnessof the Ti-Zr-killed steel had no deterioration, but the impact toughness of Al-killed steel had an obvious loss after the weldsimulation with a heat input of 70 kJ/cm. The impact absorption energy of HAZ of Ti-Zr-killed steel was improved from 6to 219 J compared to Al-killed steel.
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