摘要
针对钼的变形抗力大、韧性差、脆性明显以及高温氧化等特点,本文采用了等温锻造与粉末包套锻造相结合的工艺来提高钼制品的性能。运用DEFORM-2D软件对钼粉烧结体近等温包套镦粗成形过程进行数值模拟,研究不同工艺参数对坯料致密度、变形均匀性和表面平整度的影响规律。近等温包套锻造工艺对钼粉烧结体有较好的致密效果,锻后坯料接近全致密,且密度分布较均匀。随锻造温度的升高,坯料的平均相对密度差异较小,密度分布均匀性逐渐变好。变形速度对坯料变形的影响不显著。随摩擦系数的增加坯料平均相对密度逐渐增大,密度分布均匀性变差,且坯料的平整度降低,外观质量变差。通过正交试验分析得知,锻造温度对平均相对密度和变形均匀性影响最显著,摩擦系数是影响坯料平整度的主要因素。
In this study,aimed at its high deformation resistance,low toughness,high brittleness and easily oxidized at high temperature,a new technology which combines isothermal forging and powder-sheathed forging is employed to improve the forming property of molybdenum（Mo） products.The numerical simulation is implemented using FEM software DEFORM-2 D to study the influence on density,uniform deformation and surface flatness.Near-isothermal canning powder forging process has very good density effect on molybdenum powder sinter.The relative density is close to 1 and its uniformity is very good.Average relative density is stable first and then reduce gradually with the increasing temperature.The effect of different velocity on deformation is not remarkable.The average relative density increases.density uniformity gets worse,the flatness is reduced,the appearance quality becomes poor with the friction coefficient increasing.The effect of different temperature on average relative density and deformation uniformity is remarkable.The friction coefficient is the main factors on flatness.
出处
《金属功能材料》
CAS
2013年第2期40-44,共5页
Metallic Functional Materials
关键词
钼粉末烧结体
数值模拟
近等温包套镦粗
工艺参数
molybdenum powder sinter
numerical simulation
near-isothermal canning forging
process parameter
