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| 1 | Effect of cross wedge rolling on the microstructure of GH4169 alloy显示文摘The metal microstructure during the hot forming process has a significant effect on the mechanical properties of final products. To study the microstructural evolution of the cross wedge rolling (CWR) process, the microstructural model of GH4169 alloy was programmed into the user subroutine of DEFORM-3D by FORTRAN. Then, a coupled thermo-mechanical and microstructural simulation was performed under different conditions of CWR, such as area reduction, rolling temperature, and roll speed. Comparing experimental data with simulation results, the difference in average grain size is from 11.2% to 33.4% so it is verified that the microstructural model of GH4169 alloy is reliable and accurate. The fine grain of about 12-15 μm could be obtained by the CWR process, and the grain distribution is very homogeneous. For the symmetry plane, increasing the area reduction is helpful to refine the grain and the value should be around 61%. Moreover, when the rolling temperature changes from 1000 to 1100oC and the roll speed from 6 to 10 r·min1 , the grain size of the rolled piece decreases first and then increases. The temperature may be better to choose the value around 1050°C and the speed less than 10 r·min1 . | Ning Zhang Bao-yu Wang Jian-guo Lin | 2012 | International Journal of Minerals,Metallurgy and Materials2012，19，9： | 2 |
| 2 | 非对称楔横轧成形缺陷分析与模具参数的确定显示文摘分析了楔横轧生产过程中主要的成形缺陷:轧件不旋转、扭曲、折叠、心部缩松等,并提出了改进措施。根据轧制生产经验值及摩擦系数μ与模具成形角α、展宽角β之间的关系理论研究,建立了三者之间的关系曲线;并在此基础上分析了非对称楔横轧轧制过程中轴向力的不均衡问题,为楔横轧模具的参数选择提供依据。实验结果表明,优化后的模具轧制过程减少了轧件缺陷,提高了轧件质量。 | 李凝 王子孝 杨克己 俞小莉 陈卫增 | 2015 | 材料科学与工程学报2015，33，2： | 2 |
| 3 | 非对称楔横轧成形轴类件成形过程仿真分析显示文摘目的研究非对称楔横轧轧制单轴类件的成形过程。方法利用有限元技术仿真分析了非对称楔横轧轧制单轴类件的成形过程,获得了非对称楔横轧成形过程中轴的应力应变状态,以及轧制力与接触面积关系的变化曲线。结果仿真分析结果表明,单轴成形过程中,横截面切应变近似呈中心对称分布,由心部沿与水平方向夹角45°的方向呈半拉伸状态,呈椭圆成形特征。结论轧制楔入段需要较大的轧制力,克服材料塑性变形产生的抗力;展宽和精整段,轧制力和模具与轧件的接触面积呈线性增长趋势。 | 李凝 王子孝 杨克己 杨向勇 | 2014 | 精密成形工程2014，6，3： | 1 |
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