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7N01铝合金圆锭羽毛晶缺陷原因分析与工艺改进
Reasons Analysis and Process Improvement on Feathery Grains Defect of7N01 Aluminum Alloy Round Ingot
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- DOI:
- 作者:
- 张国伟
ZHANG Guowei
- 作者单位:
- 广西机电职业技术学院电气工程系
Department of Electrical Engineering,Guangxi Technological College of Machinery and Electricity,Nanning 530007,China
- 关键词:
- 7N01 圆锭 羽毛晶 形成原因 工艺改进
7N01 round ingot feathery grains formation reason process improvement
- 摘要:
- 采用低倍组织、显微组织观察和微观成分分析等方法,对7N01铝合金圆锭羽毛晶缺陷的形成原因进行了研究,并改进了相应的生产工艺。结果表明,结晶前沿温度梯度大、结晶核心少是造成晶粒定向长大形成羽毛晶的主要原因。通过优化生产工艺参数,如降低铸造温度、减少冷却水流量、提高铸造速度、选择合适的Al Ti5B1晶粒细化剂、加快送丝速率和延长电磁搅拌时间等方法,可以降低结晶前沿的温度梯度和增加熔体结晶核心,消除7N01铝合金圆锭的羽毛晶缺陷,并将铸锭低倍晶粒度由3级细化为2级。The formation reasons of feathery grain defects for 7N01 aluminum alloy round ingot was investigated by ways of macrostructure, microstructure observation and energy spectrum chemical composition analysis, and some corresponding manufacturing process improvement measures had been also carried out. The results show that the main causes of?feathery grains formation for 7N01 aluminum alloy round ingot are large temperature gradient in crystallization front and less nucleation cores. Feathery grain defects of 7N01 aluminum alloy round ingot can be prevented and the macro-grain size of ingot can be decreased from grade 3 to grade 2 by decreasing temperature gradient in crystallization front and increasing nucleation cores, such as reducing casting temperature, decreasing cooling water flow, increasing casting speed, choosing proper Al Ti5B1 for grain refining, speeding up wire feeding and prolonging electromagnetic stirring time for manufacturing process optimization.