(哈爾濱工業(yè)大學(xué)(威海) 材料科學(xué)與工程學(xué)院，威海 264209)
摘 要: 對板厚1.0 mm的細(xì)晶AZ31B鎂合金板材進(jìn)行快速氣壓脹形研究，在300~400 ℃的溫度范圍內(nèi)進(jìn)行了各種氣壓下300 s的快速氣壓脹形試驗，研究溫度和氣壓對AZ31B板材快速氣壓脹形能力的影響。結(jié)果表明：在不同溫度下，脹形高度均隨著氣壓的升高而增大，但氣壓升高到一定程度時，脹形時間不到300 s即產(chǎn)生破裂；脹形高度在脹形溫度400 ℃時出現(xiàn)峰值為45 mm。在400 ℃和0.6 MPa條件下，脹形5 min時相對脹形高度達(dá)到1.13。脹形件壁厚分布不均勻，溫度越高，壁厚分布不均勻度越高。最后，研究了不同溫度下快速氣壓脹形時脹形件微觀組織的演變規(guī)律。
關(guān)鍵字: AZ31B鎂合金板；快速氣壓脹形；壁厚分布；組織演變
（College of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China）
Abstract:QGBF behavior for AZ31B magnesium alloy sheet with 1.0 mm thick was studied. Half-sphere free gas bulging tests were performed at 300−400 ℃ for 300 s duration to study the effects of temperature and gas pressure on QGBF properties of AZ31B sheet. The results show that the bulging height increases with the gas pressure increasing at different temperatures, however, the bulging parts crack within 300 s when the forming temperature exceeds the threshold. And the bulging height exists peak value at 400 ℃ reaches 45 mm and the highest specific height can reach 1.13 under the condition of 400 ℃ and 0.6 MPa for 5 min duration. The thickness distribution of bulging parts is uniform, and the higher the temperature, the larger the unevenness of thickness distribution. Furthermore, the microstructure revolution in the quick gas blowing process was discussed by observing the microstructure at different temperatures.
Key words: AZ31B magnesium alloy sheet; quick gas blow forming; thickness distribution; microstructure evolution
