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对GH4720Li合金在1080~1180℃、应变速率为0.1s~(-1)条件下的双道次压缩过程的热变形行为进行研究。结果表明:动态再结晶是GH4720Li合金的主要软化机制。在双道次压缩间歇期内,合金发生亚动态再结晶、静态再结晶和晶粒长大;低于1120℃的变形间歇期,亚动态再结晶、静态再结晶和晶粒长大的速度缓慢;1120℃及以上温度的变形间歇期,亚动态再结晶、静态再结晶和晶粒长大的速度加快。随变形温度升高和第一道次变形量增大,道次间歇期的亚动态再结晶和静态再结晶速度加快。γ′相在热变形过程中发生协调变形,并发生细化。
The hot deformation behavior of GH4720Li alloy during two pass compression at 1080 ~ 1180 ℃ and strain rate of 0.1s ~ (-1) was studied. The results show that dynamic recrystallization is the main softening mechanism of GH4720Li alloy. The sub-dynamic recrystallization, static recrystallization and grain growth occurred during the two-pass compression intermission, while the intergranular deformation, sub-dynamic recrystallization, static recrystallization and grain growth slowed down below 1120 ℃ ; The intergranular deformation, sub-dynamic recrystallization, static recrystallization and grain growth at 1120 ℃ and above accelerated. With the increase of deformation temperature and the deformation of the first pass, the sub-dynamic recrystallization and static recrystallization accelerated at the intermittent pass. The γ ’phase co-deforms during the thermal deformation and refinement occurs.