-1條件下對AZ31鎂合金管材進(jìn)行了熱拉伸實(shí)驗(yàn)，分析了溫度、應(yīng)變速率對其力學(xué)性能的影響。設(shè)計(jì)制造了長軸波紋管差溫局部熱態(tài)氣壓成形裝置，利用該裝置，通過單波波紋管的熱氣脹成形研究了成形溫度、成形內(nèi)壓對波紋管成形時(shí)間、壁厚分布的影響規(guī)律，從而確定最佳成形工藝窗口，并通過五波長軸波紋管的成形驗(yàn)證該新工藝的可行性。結(jié)果表明，差溫成形過程中，低溫區(qū)最高溫度不超過50 ℃，高溫區(qū)溫度可以精確控制，誤差在±5 ℃以內(nèi)。在溫度623 K、恒定氣壓14 MPa條件下，通過小模具成功成形出五波長軸鎂合金波紋管。成形后波峰位置平均晶粒尺寸從21.8 μm細(xì)化到16.56 μm，其主要原因?yàn)槌尚芜^程中發(fā)生了動態(tài)再結(jié)晶。;A novel local hot gas forming (LHGF) process with non-uniform temperature field was proposed to form AZ31 magnesium alloy long axis bellow. Hot uniaxial tensile tests at temperatures ranging from 573 K to 673 K and strain rates ranging from 0.001 s-1 to 0.1 s-1 were carried out to study the hot deformation behavior of AZ31 magnesium alloy. Forming apparatuses with independent heating and cooling facilities were developed to achieve the non-uniform temperature field. Local hot gas forming tests of single wave bellow were performed to study the effects of temperature and gas pressure on the forming process and to determine the proper processing windows. A long axis bellow with 5 waves was finally formed to validate the novel process. Results show that the maximum temperature in the cooling zone can be kept below 50 °C and the temperature in the heating zone can be accurately con-trolled with fluctuation less than ±5 °C. A qualified AZ31 magnesium alloy long axis bellow with 5 waves is formed with small dies at 623 K under a constant gas pressure of 14 MPa. The average grain size at the wave crest is refined from 21.8 μm in the initial to 16.56 μm after forming due to the dynamic recrystallization during the forming."/>