【摘要】 研究了Ti 3 5V 15Cr(A)和Ti 2 5V 15Cr(B)两种合金 ,在不同温度下暴露 10 0h的热稳定性能。结果表明 ,随热暴露温度升高 ,合金性能恶化。60 0℃热暴露 ,B合金性能恶化的根本原因是表面氧化 ,A合金则是由于表面氧化与组织变化的共同作用。高V含量的A合金中α相比B合金中的α相更易聚集于晶界。在 45 0～ 5 40℃两合金中α相的析出及长大 ,尤其是晶界α相的析出和长大 ,是合金性能恶化并发生沿晶断裂的主要原因。更多还原

【Abstract】 The thermal stability of Ti-35V-15Cr(A) and Ti-25V-15Cr(B) alloys exposure at different temperatures from 450 to 600 ℃ for 100 h was studied. The results show that post-exposure tensile properties deteriorate with the increase of exposure temperature. When exposed at 600 ℃, the reduction of thermal stability of B alloy radically comes from surface oxidation, while that of A resulted from the combination of surface oxidation and microstructural changes. There is a tendency that more α phase agglomerated on boundaries in A with high V content than in B, which contributes a lot to the worse thermal stability of A. Precipitation and growth of α phase in A and B, especially on boundaries, are the main reasons for alloys′ property worsening and inter-granular cracking when exposed at 450～540 ℃.更多还原