La含量对钼制品制备过程中组织和性能的影响

发布时间：2018-05-22 12:03

  本文选题：La含量 + 钼制品　； 参考：《粉末冶金材料科学与工程》2015年06期

【摘要】：利用金相显微镜(OM),扫描电子显微镜(SEM)及透射电镜(TEM)对钼制品制备过程中组织演变进行研究,并分析La含量对制备过程中组织和性能的影响。结果表明:随La含量升高,粉末的粒度变细,比表面积增加;添加微量La,可提高钼制品旋锻态的抗拉强度和伸长率,随La含量升高,钼制品旋锻态的抗拉强度升高,当添加1.0%La(质量分数)时达到最大值647.9 MPa,而伸长率先升高后降低,在0.1%La时达到最大值44.7%;透射电镜的分析显示,钼制品旋锻态中的第二相颗粒为分布在晶粒内部的La_2O_3颗粒,可阻碍和储存位错以提高材料的强度和韧性。钼制品拉拔态的抗拉强度则随退火温度的升高而降低,在各个温度退火后,添加0.03%La时的抗拉强度均为最高;并且纯钼制品拉拔态的再结晶温度为1 300℃,掺La钼制品拉拔态的再结晶温度高于1 700℃。
[Abstract]:The microstructure evolution of molybdenum products was studied by means of metallographic microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM). The effect of La content on the microstructure and properties of molybdenum products was analyzed. The results show that the particle size and specific surface area increase with the increase of La content, the tensile strength and elongation of molybdenum products can be increased by adding trace La, and the tensile strength of molybdenum products in rotary forging state increases with the increase of La content. When 1.0 La was added, the maximum value was 647.9 MPA, while the elongation increased first and then decreased, and reached the maximum value of 44.7 at 0.1%La. Transmission electron microscopy analysis showed that the second phase particles in molybdenum products were La_2O_3 particles distributed in the inner grain. Dislocations can be blocked and stored to improve the strength and toughness of materials. The tensile strength of molybdenum products decreased with the increase of annealing temperature, and the tensile strength of molybdenum products was the highest after annealing with 0.03%La, and the recrystallization temperature of pure molybdenum products was 1 300 鈩，

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