压缩量和时效制度对A286高温合金组织和性能的影响

Effects of compression and aging on microstructure and properties of A286 superalloy

对经过980℃×2 h固溶处理后的A286合金进行压缩变形和时效处理,利用X射线衍射仪(XRD)观察相的元素成分;利用光学显微镜(OM)、扫描电镜(SEM)观察其显微组织;利用硬度计测试维氏硬度,对其性能进行比较,以验证析出相对时效后A286合金性能的影响。结果表明,相同压缩条件下,随着时效时间的增加,A286合金析出相数量不断增加,析出相种类以弥散γ′相、碳化钛和碳化铬为主;相同时效条件下,随着变形量的增加,析出相的数量也在不断增加。在680℃时效时,随着时效时间的延长,同一压缩量合金的硬度呈增大趋势,但增幅逐渐趋缓;经35%压缩量的合金在720℃时效8 h时硬度达到峰值。

A286 alloy after solution treatment at 980℃ for 2 h was subjected to compression and aging treatment,and the element composition of the phase was observed by means of X-ray diffraction(XRD).Microstructure was observed by means of metallographic microscope(OM)and scanning electron microscope(SEM).Vickers hardness was measured by hardness tester,and the properties were compared to verify the effect of precipitation on properties of A286 alloy after aging.The results show that under the same compression conditions,with the increase of aging time,the number of precipitates increases,and the precipitates are mainly γ′phase,TiC and chromium carbide.Under the same aging conditions,with the increase of deformation,the number of precipitates also increases.When aged at 680℃,with the increase of aging time,the hardness of the alloy with same deformation shows an increasing trend,but the increasing rate gradually slows down.The hardness of the alloy with compression of 35%reaches the peak value when aged at 720℃ for 8 h.