材料期刊网

为解决Fe-Ni-Co-Cu系合金应用中因高温退火晶粒粗大而引起的质量问题,研究了Zr对此类合金再结晶过程中晶粒长大特性的影响。结果表明,Zr可有效地细化合金的晶粒。经1050℃退火后,合金晶粒度为5—6级。 本文研究了Zr在合金中存在的形式,以探明Zr抑制高温晶粒长大的原因。分析了添加Zr形成的第二相质点类型、尺寸对抑制晶界推移的作用,并讨论了影响Zr抑制晶粒长大效果的因素。 实验结果表明,Zr可使与合金晶粒度有关的性能(如抗焊料渗透性、热加工性、化学稳定性及抗应力腐蚀开裂性能等)得到改善,而对合金的热膨胀性能、力学性能、氩弧焊可焊性等均无大的影响。合金的应用试验表明,添加适量Zr后,使用性能良好。

In order to control the quality induced by the grain growth during high temperature annealing of Fe-Ni-Co-Cu type alloys, Zr modification can effectively control the grain size to ASTM grade 5 to 6 during annealing at 1050℃.The form of existence of Zr in the alloys is investigated to search for the mechanism of grain growth retarded by Zr.The effect of the structure and size of particles formed by Zr on retarding the grain boundary mobility is analyzed and the factors influencing the effect of Zr retarding grain growth are discussed.It is shown that the addition of Zr in these alloys has improved the properties concerned with grain refinement, such as the characteristics of the grain boundary penetration by brazing alloys, workability, chemical stability, anti-SCC ability etc., and had little effect on its thermal expansion, mechanical properties and weldability by of TIG welding. These alloys modified by proper amount of Zr showed good performance during application to instruments and apparatus.