退火对轧制包覆碳钢/铝夹层带材组织与性能的影响

研究了轧制包覆法制备的碳钢/铝夹层带材的退火热处理工艺.利用OM,SEM,X射线衍射仪等分析了退火温度、退火时间等对复合界面金属间化合物生长的影响,在材料力学试验机上测试了复合带的主要力学性能.结果表明:退火过程中碳钢/铝复合带界面金属间化合物生成的临界温度为420℃,生成的金属间化合物主要为FeAl3相,化合物层的厚度约为10μm.420℃退火20 min是本实验得到的复合带最佳退火制度,退火后复合带的延伸率可达18.28%.退火后,当脆性金属间化合物层沿复合界面连续分布时,复合带的延伸率低于5%.

Effect of Annealing Process on Microstructure and Properties of Al-Carbon Steel-Al Sandwich Strip by Roll Cladding

The annealing process of the Al-carbon steel-Al sandwich strip produced by roll cladding was investigated. The effects of annealing temperature/time on the growth behavior of interfacial intermetallics were analyzed by metalloscope, SEM and XRD with the main mechanical properties tested. The results showed that the critical forming temperature of the intermetallics is 420°C, at which the main compound is of FeAl3 phase and the layer thickness is about 10μm. The optimum annealing schedule obtained from testings is 420°C for 20 min. The elongation of the strip after annealing comes up to 18.28% and, however, it will be lower than 5% if the brittle intermetallics distribute continuously on interfaces.