钛质量分数对LF2合金微观组织与性能的影响

Effect of Ti content on microstructure and performance of LF2 alloy

采用热力学计算软件对LF2合金中的析出相进行计算,采用扫描电子显微镜、透射电子显微镜、微细相分析以及拉伸试验,对不同钛质量分数的LF2合金的微观组织和力学性能进行了研究,结果表明:LF2合金中γ′相以近球形在晶内弥散析出,尺寸约为20 nm,Laves相在晶界以纤维状和块状析出;随钛质量分数增加,γ′相数量增加,钛质量分数增加了0.92%,γ′相的质量分数是原来的1.35倍;Laves相数量增多,由纤维状变为短棒状。随钛质量分数增加,LF2强度增加,γ′相强化效果相对减弱,但γ′相仍然是最主要的强化相。

Equilibrium precipitation phases of LF2 alloys were studied by using a thermodynamic Thermo-Calc soft-ware,microstructure and mechanical properties of LF2 alloys bearing different Ti content were studied by using scanning electron microscopy,transmission electron microscopy,subtle phase analysis and tensile test. The results show that γ′phase is diffusely distributed in transgranular substantially spherical which size is about 20 nm. Laves phase precipitated with fibrous and block in the grain boundary. With the increase of Ti content of,the content ofγ′phase increased,Ti con-tent has increased 0.92 percent,the quality percentage of Laves phase is 1.35 times of the original,the content of Laves phase increased,transforming fibrous into short clavate shape. With the increase of Ti content,the strength of LF2 alloys increases,strengthening effect ofγ′phase is relatively weak,butγ′phase is still the main strengthening phase.