稀土钼合金制备工艺及强韧化机理研究现状

PRESENT RESEARCH STATUS OF PREPARATION TECHNOLOGY OF RARE EARTH MOLYBDENUM ALLOYS AND STRENGTHENING-TOUGHENING MECHANISM

钼合金作为新一代具有重要战略意义的稀有金属,具有熔点高、强度大、硬度高、高温性能优异、导电导热性好等优点,广泛应用于冶金、石油、机械、化工、钢铁工业、航空航天、核能技术等诸多领域。然而,由于钼的塑脆转变温度较高,当合金使用温度高于再结晶温度时,合金明显脆化及高温强度显著下降限制了其在诸多领域的应用。在钼中添加稀土可细化晶粒,降低钼的塑脆转变温度,提高钼的再结晶温度、高温强度,改善塑韧性及高温蠕变性能。本文综述了稀土掺杂钼合金制备方法体系的不同特点,总结了稀土掺杂钼合金的强韧化机理并进行了对比分析,展望了国内外稀土掺杂钼合金制备方法及强韧化机理的研究发展趋势,对目前稀土掺杂钼合金制品的应用现状进行了综合评述。

Molybdenum alloy, as a new strategically important generation of rare metals, is widely used in metallur-gy ,petroleum, machinery,chemical,iron and steel industry, aerospace,nuclear industry and other areas. Because the DBTT （ductile -brittle transition temperature） of molybdenum is high, its application in many fields is limited. When the temperature is at or above the recrystallization temperature, the alloy is obviously embrittled, and the high temperature strength decreases significantly. The addition of rare earth to molybdenum can refine the grain and reduce the DBTT, not only improve the recrystallization temperature and high temperature strength, but also improve the plastic toughness and high temperature creep performance. The different characteristics of preparation methods of rare earth doped molybdenum alloy are reviewed. The strengthening-toughening mechanism of rare earth doped molybdenum alloy is summarized and compared, then the development trends are discussed. Based on the analysis and review about the rare earth doped molybdenum alloy products, the current research status is conducted.