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Baoqun Ning,Yong Nie,Qian Wang,Yu Fu,Yue Li,Jian Han,Yingfeng Shao,Jiuchun Yan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
This paper introduced a method of rapid solid-phase bonding Al block with Ag as the intermediate layer by longitudinalultrasonic vibration under eutectic temperature in the atmospheric environment. This method is suitable for the application ofstructural lightweight design. It was observed that Al and Ag difuse with each other in the weld seam to form an intermetallic compound Ag2Al with close hexagonal structure. The efects of diferent reaction temperatures and ultrasonic vibrationtimes on the microstructure and mechanical properties of intermetallic compound Ag2Al were discussed. The infuence ofthe efect of ultrasonic softening waves on surface oxide flm rupture and element difusion was explored. With the increaseof ultrasonic vibration time, the intermetallic compounds grew along with the interface and the thickness increased. Whenthe welding temperature was 500 °C and the ultrasonic vibration was 20 s, the highest average strength of the welded jointreaches 46.68 MPa.
Lei Shi,Zesheng Yan,Yongchang Liu,Xu Yang,Zhixia Qiao,Baoqun Ning,Huijun Li 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
The development of banded structure in HSLA steel during continuous cooling has been systematicallystudied using dilatometry and microstructural observations. At low cooling rates (<10 °C/min), the micro-structure contains alternating bands of ferrite and a mixture of pearlite and bainite. At higher cooling rate(>10 °C/min), the formation of pearlite is suppressed, and the corresponding microstructure consists ofbanded ferrite and bainite. Dilatometric analysis indicates that as ferrite and pearlite transformation at lowrates (or ferrite transformation at higher rates) completes, Manganese (Mn) and Carbon (C) concentrationin austenite can retard the bainitic transformation and result in the transformation stagnancy phenomenon. The magnitude of retardation and the bainite morphology are affected by Mn and C concentration. Theincreased cooling rate decreases Mn and C content in bainite, and then the length of the stagnant stagedecreases and bainite morphology changes from lower bainite to acicular ferrite.