Mo-La_2O_3波纹板显微结构与耐高温性能的构效关系
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摘要
本文研究La_2O_3第二相颗粒增强的钼镧合金(Mo-La_2O_3)波纹板高温环境中显微结构的变化规律,探明钼镧合金的显微结构与耐高温性能的构效关系。研究表明,新品波纹板中钼晶粒细小、TD方向晶粒度～48μm、RD方向～28μm;呈纳米尺度的La_2O_3颗粒主要分布于钼晶粒内,少量分布在钼晶界上,强化效果主要来源于氧化镧颗粒对位错运动的钉扎。随着入炉使用次数增多,钼晶粒由外向内逐渐长大直至将细小晶粒吞并、形成粗大显微结构。氧化镧颗粒在高温下与位错、晶界的交互作用能有效强化钼晶内和晶界,提高流变应力和蠕变应力的抗力,提高显微结构的稳定性,提高塑性变形能力。
In this paper, the microstructure changing law of Mo-La_2O_3 corrugated plate enhanced by La_2O_3 second phase particles in hot environment was studied. The structure-function relationship between microstructure and high temperature resistance of Mo-La_2O_3 was investigated. The results show that the molybdenum grain size in the new corrugated plate is small, as well as the grain size of TD direction was ～48 mm and RD direction ～28 mm, respectively. The nanoscale La_2O_3 particles are mainly distributed in the molybdenum grain, and a few are distributed on the molybdenum grain boundary. La_2O_3 can fix the dislocations effectively, and strengthen the Mo-La_2O_3 corrugated plate. As the number of times of tested increases, molybdenum grains grow from the outside to the inside until the fine grains are swallowed up to form a thick and large microstructure. The interaction of La_2O_3 particles with dislocation and grain boundary at high temperature can effectively strengthen the inner & boundary of molybdenum grain, improving the resistance of rheological stress and creep stress, enhancing the stability of microstructure, and increasing the plastic deformation ability.
In this paper, the microstructure changing law of Mo-La_2O_3 corrugated plate enhanced by La_2O_3 second phase particles in hot environment was studied. The structure-function relationship between microstructure and high temperature resistance of Mo-La_2O_3 was investigated. The results show that the molybdenum grain size in the new corrugated plate is small, as well as the grain size of TD direction was ～48 mm and RD direction ～28 mm, respectively. The nanoscale La_2O_3 particles are mainly distributed in the molybdenum grain, and a few are distributed on the molybdenum grain boundary. La_2O_3 can fix the dislocations effectively, and strengthen the Mo-La_2O_3 corrugated plate. As the number of times of tested increases, molybdenum grains grow from the outside to the inside until the fine grains are swallowed up to form a thick and large microstructure. The interaction of La_2O_3 particles with dislocation and grain boundary at high temperature can effectively strengthen the inner & boundary of molybdenum grain, improving the resistance of rheological stress and creep stress, enhancing the stability of microstructure, and increasing the plastic deformation ability.
引文
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[2]李敏.钼镧合金厚板材退火工艺对其热成形性影响研究[J].中国钨业,2018,33(03):41-45.
[3]刘涛,史振琦,白秋平,张航,王岗,赵冠寅.高镧钼合金稀土相研究[J].中国钨业,2015,30(06):63-66.
[4]聂祚仁,左铁镛,周美玲,王亦曼,王金淑,张久兴.High Temperature XPS/AES Investigation of Mo-La2O3CathodesⅡ.Variation of Lanthanum During Activation Processes[J].Journal of Rare Earths,2000(02):110-114.
[5]王艳,王国栋,武宇,谭栓斌,郭让民,赵鸿磊,刘建章.钼镧合金中稀土相的研究[J].稀有金属,2007(S1):50-53.
[6]INTERACTIONS BETWEEN La2O3particles and dislocations in Mo-La2O3alloys[J].Acta Metallurgica Sinica(English letters),2005(06):714-718.
[7]韩强.Mo-La2O3复合材料微观结构与力学性能的研究[J].中国钼业,2011,35(06):49-52.
[8]王海文,翟王齐,韩晓兰,等.核电乏燃料元件烧结用铝钢舟皿的热冲压工艺研究[J].锻压装备与制造技术,2016,51(6):52-56.
[9]刘宏亮,李晶,杨政伟,等.镧含量对钼镧合金厚板的高温力学性能的影响[J].中国钨业,2015,30(4):64-67.
[10]祁美贵,郑艾龙,黄志民,等.钼镧合金板材高温抗下垂性能的研究[J].中国钨业,2016,31(6):46-48.
[11]张威.纯钼及钼镧合金轧制工艺及组织性能研究[D].东北大学,2014.
[12]何欢承,王快社,胡平,等.掺杂稀土元素镧对TZM合金板材再结晶行为的影响[J].稀有金属材料与工程,2015,44(5):1297-1300.