生产2A70铝合金A级探伤制品用的铸锭,要求具有高的纯洁度和更好的冶金质量。通过按化学成分内部标准配料,采用在电炉内投固体料进行熔炼,用一号熔剂覆盖保护熔体;通过炉前化学成分分析控制合金熔体的成分在内标范围内,尤其是w(Fe):w(Ni)...生产2A70铝合金A级探伤制品用的铸锭,要求具有高的纯洁度和更好的冶金质量。通过按化学成分内部标准配料,采用在电炉内投固体料进行熔炼,用一号熔剂覆盖保护熔体;通过炉前化学成分分析控制合金熔体的成分在内标范围内,尤其是w(Fe):w(Ni)≈1,w(Fe)或w(Ni)>1.25%时必须对熔体冲淡,以防止成分偏析和生成粗大化合物一次晶体;加强除气除渣,除在熔炼炉中精炼熔体外,在静置炉中再用Ar气精炼,在铸造过程中用ALTECH装置在线除气,用陶瓷片在线过滤熔体,并在线播种Al-Ti-B丝细化晶粒;采用合适的铸造工艺参数。这样生产出的Φ270 mm 2A70铝合金铸锭质量,能满足生产高质量的A级控伤制品的要求。展开更多
对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提...对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提升后下降。与440℃始锻温度的试样性能相比,480℃始锻后试样的磨损体积减小48.48%,腐蚀电位则正移78 m V。2A70-0.5Ce0.25Ti铝合金模锻叶片试样的始锻温度优选为480℃。展开更多
The hot deformation behavior of 2A70 aluminum alloy was investigated by means of isothermal compression tests performed on a Gleeble-1500 thermal simulator over 360～480 ℃ with strain rates in the range of 0.01～1 s-...The hot deformation behavior of 2A70 aluminum alloy was investigated by means of isothermal compression tests performed on a Gleeble-1500 thermal simulator over 360～480 ℃ with strain rates in the range of 0.01～1 s-1 and the largest deformation up to 60%. On the basis of experiments, a BP artificial neural network （ANN） model was constructed to predict 2A70 aluminum alloy flow stress. True strain, strain rates and temperatures were input to the network, and flow stress was the only output. The comparison between predicted values and experimental data showed that the relative error for the trained model was less than ±3% for the sampled data while it was less than ±6% for the non-sampled data. Furthermore, the neural network model gives better results than nonlinear regression method. It is evident that the model constructed by BP ANN can be used to accurately predict the 2A70 alloy flow stress.展开更多
文摘生产2A70铝合金A级探伤制品用的铸锭,要求具有高的纯洁度和更好的冶金质量。通过按化学成分内部标准配料,采用在电炉内投固体料进行熔炼,用一号熔剂覆盖保护熔体;通过炉前化学成分分析控制合金熔体的成分在内标范围内,尤其是w(Fe):w(Ni)≈1,w(Fe)或w(Ni)>1.25%时必须对熔体冲淡,以防止成分偏析和生成粗大化合物一次晶体;加强除气除渣,除在熔炼炉中精炼熔体外,在静置炉中再用Ar气精炼,在铸造过程中用ALTECH装置在线除气,用陶瓷片在线过滤熔体,并在线播种Al-Ti-B丝细化晶粒;采用合适的铸造工艺参数。这样生产出的Φ270 mm 2A70铝合金铸锭质量,能满足生产高质量的A级控伤制品的要求。
文摘对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提升后下降。与440℃始锻温度的试样性能相比,480℃始锻后试样的磨损体积减小48.48%,腐蚀电位则正移78 m V。2A70-0.5Ce0.25Ti铝合金模锻叶片试样的始锻温度优选为480℃。
文摘The hot deformation behavior of 2A70 aluminum alloy was investigated by means of isothermal compression tests performed on a Gleeble-1500 thermal simulator over 360～480 ℃ with strain rates in the range of 0.01～1 s-1 and the largest deformation up to 60%. On the basis of experiments, a BP artificial neural network （ANN） model was constructed to predict 2A70 aluminum alloy flow stress. True strain, strain rates and temperatures were input to the network, and flow stress was the only output. The comparison between predicted values and experimental data showed that the relative error for the trained model was less than ±3% for the sampled data while it was less than ±6% for the non-sampled data. Furthermore, the neural network model gives better results than nonlinear regression method. It is evident that the model constructed by BP ANN can be used to accurately predict the 2A70 alloy flow stress.
