铸轧AZ31镁合金热模拟的微观组织研究  

Study on microstructure of roll-cast AZ31 magnesium alloy by thermal simulation

作　　者：娄花芬[1] 汪明朴[1] 李宏磊 李向宇 马可定 李周[1] 郭明星[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]洛阳铜加工集团有限责任公司,河南洛阳471039

出　　处：《材料热处理学报》2007年第1期96-100,共5页Transactions of Materials and Heat Treatment

摘　　要：用Geeble1500热模拟实验机模拟不同始轧温度、冷却强度以及变形量和应变速率下AZ31合金的铸轧行为。结果显示:AZ31镁合金铸轧组织对应变速率和变形量均具有较强的敏感性。当.ε由0.005s-1增到0.1s-1时,铸轧组织的晶粒逐渐变小,同时晶界析出物减少。变形量ε由20%增加到50%时,晶粒组织细化明显。试验得出了AZ31镁合金连续铸轧工艺的边界工艺条件,在此条件下,获得铸轧板的力学性能如下:70 HV0.5,σb为210-240 MPa,σ0.2为180-200MPa,δ为3%-6%。The behavior of continuous roll-casting of AZ31 alloy under different roll-casting temperature, intensity of cooling, strains （ε） and strain rates （ε） was investigated by means of thermal simulation on a Gleeble 1500 simulator. The results show that the microstructure of continuously roll-cast AZ31 alloy is sensitive to beth strain and strain rate. The grain size of roll-cast AZ31 alloy decreases for ε in the range of 0.005s-1 to 0. 1s^-1 and the precipitation along with beundary decreases with increasing of ε .The grain size of the alloy decreases with increasing of ε in the range of 20 % to 50 %. The processing condition for continuous roll-casting of the AZ31 alloy is obtained and the HV0.5, σb,σ0.2, and ε of the sheet of the continuously roll-cast AZ31 alloy are 70HV0.5,210- 240MPa, 180- 200MPa and 3% -6% ,respectively.

关 键 词：变形镁合金 铸轧 热模拟 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]