摘要
研究了(α+β)两相区轧制后TiB_(w)/TA15复合材料的固溶时效及双重退火的热处理工艺。结果如下:两相区固溶处理时,随着固溶温度的升高,初生α相含量减少,β转变组织中球状次生α_(s)相尺寸增加,含量减少,时效过程中αs重新以细小针状α相析出,显微硬度值随着两相区固溶温度的升高而增大;单相区固溶处理后复合材料基体组织为典型网篮状组织,β晶粒和α片层尺寸细小,复合材料整体显微硬度值较高;固溶时间对复合材料显微组织及硬度影响较小;复合材料在650~750℃温度范围内时效1~2h,组织中次生αs片层尺寸变化不明显,显微硬度值随片层的粗化略微下降;采用990℃/0.5h/AC+900℃/1h/AC和1100℃/0.5h/AC+900℃/1h/AC的双重退火工艺可明显细化α片层,提高复合材料显微硬度。TiB晶须在热处理过程中属于稳定相,热处理工艺的改变不会引起TiB晶须的明显变化;热处理过程中初生α_(p)含量、α_(s)尺寸、β晶粒尺寸以及α片层尺寸的变化是影响复合材料显微硬度值的关键因素。
The heat treatment process of solution aging and dual annealing of TiB_(w)/TA15 composite after rolling in the(α+β)region was studied.During the solution treatment in(α+β)region,as the solution temperature increases,the primaryαphase content decreases,the spherical secondaryαphase content in theβtransition tissue decreases,and the size increases.The secondaryαs phase was separated with small needleα,and the microhardness value increases with the consolidation temperature in the(α+β)region.After solution treatment in theβregion,composite matrix tissue is basketlike structure,βgrain andαlath are small,and the overall microhardness of the composite material is relatively high.Solution time has little effect on the microstructure and hardness of composite materials.The size change of secondaryαlath in the 650–750℃temperature range,and the microhardness decreases slightly with the roughening of the lath.The dual annealing process of 990℃/0.5h/AC+900℃/1h/AC and 1100℃/0.5h/AC+900℃/1h/AC can significantly refine theαlath and improve the microhardness of the composite materials.TiB whiskers are stable phase during heat treatment,and the change of heat treatment process will not cause obvious changes in TiB whiskers.Changes of primaryαphase content,secondaryαphase size,βgrain size andαlath size are the key factors affecting the microhardness of composite materials.
作者
刘莹莹
付明杰
王富鑫
曾元松
LIU Yingying;FU Mingjie;WANG Fuxin;ZENG Yuansong(AVIC Manufacturing Technology Institute,Beijing 100024,China)
出处
《航空制造技术》
CSCD
北大核心
2021年第14期40-48,共9页
Aeronautical Manufacturing Technology
