论文部分内容阅读
对2124铝合金板状试样在185℃,时效5~15h及试验应力为150~250MPa条件下,采用RWS50型电子式蠕变松弛试验机进行拉伸蠕变时效成形试验,得到了不同时效时间和试验应力下材料的蠕变应变。通过金相观察、硬度(HV)测试等方法,在185℃×8h、185℃×12h,试验应力为200~250MPa条件下,得到了材料蠕变时效后的金相组织和室温硬度。结果表明,时效时间和试验应力对材料的成形有较大的影响。在185℃×(0~15)h,200MPa应力条件下,材料的硬度随时效时间的增加而增加。在15h时,材料达到最大硬度(HV)为136.7。蠕变速率、应变量和晶粒尺寸随时效时间、试验应力的增加而增大。
The tensile creep aging test was carried out on a 2124 aluminum alloy plate specimen at 185 ℃ for 5-15h and a test stress of 150-250MPa by using the RWS50 electronic creep relaxation tester. Different aging time And creep strain of the material under test stress. The metallurgical structure and room temperature hardness of the material after creep aging were obtained by metallographic observation and hardness test at 185 ℃ × 8h, 185 ℃ × 12h and test stress of 200 ~ 250MPa. The results show that the aging time and the experimental stress have a great influence on the forming of the material. At 185 ℃ × (0 ~ 15) h, 200MPa stress, the hardness of the material increases with the aging time. At 15 h, the material reached a maximum hardness (HV) of 136.7. Creep rate, strain and grain size increase with aging time and test stress.