论文部分内容阅读
研究了2种Ti/Al比对新型Ni-Fe-Cr基合金GH984G在长达上万小时高温时效过程中γ′淀相的粗化行为及其拉伸性能的影响规律.结果表明:随时效温度从700℃升高至800℃,球形γ′沉淀相的粗化速率明显增大.在700和750℃长期时效过程中,高Ti/Al比和低Ti/Al比合金γ′沉淀相的粗化行为均符合Lifshitz-Slyozof-Wagner(LSW)理论,受扩散过程控制,高Ti/Al比合金中γ′沉淀相的粗化速率较高.800℃长期时效过程中,2种Ti/Al比合金γ′沉淀相的粗化行为偏离LSW理论.此外,时效时间小于3×103h时,高Ti/Al比合金的γ′沉淀相长大较快,进一步延长时效时间,低Ti/Al比合金的γ′沉淀相长大速率较快.Ti/Al比对合金标准热处理态和700~800℃时效10480 h后合金的700℃拉伸性能无明显影响.通过选取合适的Ti/Al比,可以控制γ′沉淀相的粗化行为,增强合金组织稳定性.
The effects of two Ti / Al ratios on the coarsening behavior and tensile properties of γ ’phase during aging at up to ten thousand hours were studied for the new Ni-Fe-Cr based alloy GH984G. The results show that with aging The coarsening rate of the spherical γ ’precipitates increased obviously when the temperature was increased from 700 ℃ to 800 ℃. The γ’ precipitates with high Ti / Al ratio and low Ti / Al ratio during the long-term aging at 700 and 750 ℃ The roughening behavior is in accordance with the Lifshitz-Slyozof-Wagner (LSW) theory and is controlled by the diffusion process. The γ ’precipitation phase in the high Ti / Al alloy has a higher coarsening rate. During 800 ℃ long-term aging, Compared with the LSW theory, the roughening behavior of the γ ’precipitates was deviated from that of the LSW.In addition, when the aging time is less than 3 × 103h, the γ’ precipitates of the high Ti / Al alloy grow faster and further extend the aging time, low Ti / Al ratio The γ ’precipitation rate of the alloy is relatively large, and the tensile / tensile properties of the alloy at 700 ℃ after aging at 700-800 ℃ for 10480 h have no obvious effect on Ti / Al ratio.After choosing suitable Ti / Al ratio, It can control the coarsening behavior of γ ’precipitates and enhance the stability of the alloy.