5A06-O铝合金板材折弯开裂原因分析及改善建议

Cause analysis and improvement suggestions for bending cracking of 5A06-O aluminum alloy sheet

针对3 mm厚5A06-O铝合金板材折弯开裂现象,从化学成分、力学性能、折弯性能及显微组织等角度进行了分析。结果表明,5A06-O铝合金板材折弯开裂的主要原因是板材退火处理不充分,导致板材芯部强度高、塑性低,板材各部分力学性能的匹配性差。通过严格执行工艺制度并控制装炉量和装料高度,强度控制在中下限水平,可有效避免板材出现折弯开裂现象。

Analysis was conducted on the bending cracking of 3 mm-thick 5A06-O aluminum alloy sheet from the aspects of chemical composition, mechanical properties, bending properties and microstructure. The results show that the main reason for bending cracking of 5A06-O aluminum alloy sheet is that insufficient annealing leads to high strength and low plasticity of the sheet core and poor matching of the mechanical properties of each part of the sheet. By strictly implementing the process system and controlling the charging amount and charging height, the performance value can be controlled at the middle and lower limit, which can effectively avoid bending and cracking of sheets.