【作者】 李纯迟；

【导师】 蒋显全；

【作者基本信息】 西南大学 ， 材料物理与化学， 2007， 硕士

【摘要】 不粘锅用材要求深冲性能良好，表面无裂纹。本文针对新型不粘锅用材A10.8Mn0.5Fe系铝板铸轧坯料进行了均匀化处理系统研究。通过不同均匀化温度下力学性能检测、金相微观组织分析，研究了不同均匀化温度和不同退火时间与铸轧板坯的微观组织、力学性能之间的变化规律，以及不同升温速度对临界变形度及成品组织和性能的影响。主要结论如下：(1)在均匀化过程中，合金的显微组织主要出现两个方面的变化：一方面，500℃以下均匀化，非平衡的过饱和固溶体基体先析出平衡相，580℃以上的均匀化，这些平衡相又回溶到固溶体基体中；另一方面，铸锭凝固时枝晶间存在的粗大金属间化合物逐渐溶解球化，到540℃～580℃时枝晶基本消失，高于580℃均匀化晶粒显著粗化。(2)540℃均匀化后，第二相最细小弥散，晶粒为椭圆的等轴晶，最适宜的均匀化工艺为540℃保温4小时。(3)均匀化温度为540℃、580℃时成品抗拉强度和延伸率几乎都在460℃下出现最低点，其变化趋势像双“V”字型，与一般的剪刀型曲线不一样，其变化规律与一般铝合金退火过程中的变化规律不同。(4)经过540℃、580℃均匀化处理后的两种样品，其抗拉强度和延伸率在成品退火温度为460℃时分别出现最低点和相对最高点，满足Al0.8Mn0.5Fe作为不粘锅深冲材料的综合性能。因此，在540℃、580℃的均匀化温度下退火，可使成品材料获得有益的抗拉强度和延伸率。(5)当均匀化升温速度为2.0℃／min时，可使材料组织发生再结晶并得到低抗拉强度和高延伸率的力学性能。在540℃下均匀化，保温4h后的成品组织都是沿着轧向呈拉长的纤维组织，保温8h后的成品组织随着冷变形量的增加而逐渐发生再结晶。因此，在相同的均匀化温度(540℃)和成品退火制度下，均匀化时间越短，成品合金试样发生再结晶所需的临界变形度越大。更多还原

【Abstract】 Good deep-drawing property and no cracks on the surface is required for non-viscous pan materials. The homogenization annealing on A10.8Mn0.5Fe stock Alloy strips by continuous cast-rolling for new non-viscous pan materials were systematically studied in this article. Combining with mechanical property testing and microstructure analysis which with different homogenization temperature, effect of homogeneously annealing temperature and time on microstructure, heating-up speed on critical deformation value were studied. Main conclusion as follows:(1) Two aspects changes in microstructure of alloy in the course of homogenization annealing: On the one hand, equilibrium phase precipitated firstly from non-equilibrium supersaturated solid solution when homogenization temperature is below 500℃. The equilibrium phases resolve into the solution matrixes when homogenized above 580℃. On the other hand, the large intermetallic compound which formed when cast ingot solidificated dissolved and spheroidized. Dendrite microstructure disappeared when temperature is between 540℃-580℃, and the grains were coarsened remarkably when homogenization temperature above 580℃.(2) The fine second phase were dispersed and the grains were elliptical equiaxed grains after homogenization treatment at 540℃. So the appropriated homogenization treatment processing should be at 540℃for 4h.(3) Both of the tensile strength and elongation of final product almost appeared lower-most point when homogenization temperature at 540℃580℃. The varying rule like V pattern, and didn’t like conventional scissors curve. So varying rule was different from conventional curve.(4) Tensile strength of final product appeared lower-most point and elongation appeared peak when treatment temperature at 460℃which the homogenization temperature at 540℃and 580℃. And it meet requirement of deep-drawing material as the non-viscous pan. So final product may obtained the best tensile strength and elongation when annealed at 460℃or 580℃.(5) The product occurred recrystallization and the mechanical property appeared lower Tensile strength and high elongation. The structure was fibrous grain along roll direction when homogenization at 540℃for 4h. And it occurred recrystallization when for 8h. So, the homogenization time litter, critical deformation of the product larger, when homogenization at same temperature(540℃) and same annealing technology.更多还原