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| 1 | Nb含量对GH4169合金钢锭凝固及均匀化过程相演化规律的影响显示文摘以不同Nb含量的直径160 mm GH4169合金钢锭为研究对象,利用热力学软件Thermo-Calc的模拟计算及电子探针成分分析,系统研究了Nb元素含量变化对GH4169合金钢锭凝固及均匀化过程相演化规律的影响。结果表明:Nb元素含量的增加会降低合金初熔点和终熔点,扩大凝固区间,增加偏析形成的趋势;Nb元素含量的增加还可以提高GH4169合金钢锭凝固过程Laves相的析出温度,若Nb元素偏析浓度超过7.0%,Laves相的析出温度会高于标准均匀化温度1160℃,导致部分高浓度下生成的Laves相无法回溶。进一步的凝固过程中各相Gibbs自由能变化规律分析表明,GH4169合金凝固过程中,当达到Laves相的析出温度后,Laves相的形成激活能要显著小于MC碳化物,此时高浓度的Nb元素主要用于Laves相的析出和生长,Laves相的大量形成抑制了MC碳化物的进一步形成和长大,导致了Laves相与MC碳化物集合体的产生。上述的热力学分析结果与实际钢锭的相析出回溶实验结果一致。 | 曹国鑫 张麦仓 董建新 姚志浩 郑磊 | 2014 | 稀有金属材料与工程2014，43，1： | 14 |
| 2 | 喷射成形FGH95高温变形流变应力行为与预测显示文摘在变形温度为1 050~1 140℃、应变速率为0.01~10 s 1和变形率为50%的条件下,采用Gleeble 1500热模拟机研究喷射成形FGH95合金的热压缩变形行为。结果表明:在合金热压缩变形初始阶段,流变应力随应变的增加迅速增大,达到峰值应力后逐渐减小,呈现明显的动态软化特征;合金流变应力随变形温度的升高和应变速率的降低而显著减小;应变速率为0.1~10 s 1时,合金峰值应变随温度升高而减小,并趋于平稳;而应变速率为0.01 s 1时,合金峰值应变在1 100℃出现极大值。考虑变形量对合金热压缩流变行为的影响,引入包含应变量的四次多项式函数对双曲正弦修正的Arrhenius方程进行改进,改进后的本构方程的流变应力预测值与实验值吻合较好,平均相对误差为3.64%。 | 郭彪 葛昌纯 徐轶 张宇 孙传水 | 2012 | 中国有色金属学报2012，22，11： | 6 |
| 3 | Flow Behavior and Numerical Simulation of Spray-Formed FGH95 Superalloy Under Hot Compression显示文摘The flow behavior of spray-formed FGH95superalloy(similar to Rene 95)was investigated at temperatures ranging from 1050to 1140℃and strain rate ranging from 0.01to 10s-1.At a given temperature and strain rate,flow stress increases quickly with increasing strain and then reaches a peak,then gradual decreases until high strain,and dynamic softening is observed.Utilizing the hyperbolic sine function and introducing the strain with nonlinear fitting,the revised constitutive equations incorporating the effects of temperature,strain rate and strain for high temperature flow stress prediction of superalloy were established.The revised constitutive equations were implanted into finite element software by second development to simulate the hot compression process successfully,and the effective stress and load stroke curves obtained by numerical simulation are good agreement with the experimental results. | GUO Biao GE Chang-chun XU Yi | 2013 | Journal of Iron and Steel Research(International)2013，20，12： | 5 |
| 4 | Isothermal forging process design for spray-formed FGH95 superalloy turbine disk based on numerical simulation显示文摘Based on the experimental data from hot compression tests on Gleeble 1500 thermal simulator, the revised constitutive equations of spray-formed FGH95 superalloy considering the effect of strain on the material constants were established. The average absolute relative error(AARE) was employed to verify the validity of the constitutive equation, and the value of AARE is 3.85 %. Subsequently, the revised constitutive equations were successfully used to simulate and analyze the deformation behavior, stress distribution, forming loads and temperature distribution in both dies and billet during the isothermal forging process of turbine disk of large dimension(about 400 mm in diameter) by the means of finite element method(FEM). Moreover, the optimum process parameters are 1,120 °C of forging temperature and 0.01 s-1 of strain rate for the spray-formed FGH95 superalloy turbine disk. | Biao Guo Chuan-Sui Sun Sui-Cai Zhang Chang-Chun Ge | 2013 | Rare Metals2013，32，4： | 3 |
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