Mo对650℃高温钛合金组织和性能的影响
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摘要
研究了Mo对650℃高温钛合金组织和性能的影响。研究表明:Mo可以细化钛合金的显微组织,且能在较小幅度降低其室温塑性的前提下,显著提高其室温强度;Mo对钛合金650℃高温强度和塑性影响不显著;合金的高温持久性能和蠕变性能具有强烈的组织和温度敏感性,初生α相含量和温度对钛合金高温持久性能和蠕变性能的影响远大于Mo;在较高温度下(初生α相体积分数约为15%),Mo的质量分数为0.6%时,对钛合金热稳定性能有很好的改善作用。
In the paper,effect of molybdenum on microstructure and mechanical properties of high temperature titanium alloy used at 650℃ was studied.The results show that molybdenum can refine the microstructure of the alloy,and can significantly increase the room temperature strength of the material without significantly reducing the room ductility intensively.But it has no significant effect on the elevated temperature strength and ductility at 650℃.Endurance and creep property of this alloy are dependent on the microstructure and testing temperature.In some sense,the volume fraction of priorαphase in the microstructure has a larger contribution to the endurance and creep property than molybdenum element for this alloy.Based on this work,a suggested treatment for this alloy with favorable heat endurance property is to be treated at higher solution temperature.In this case,the volume fraction of priorαin the treated microstructure was about 15%and the Mo content was 0.6%.
In the paper,effect of molybdenum on microstructure and mechanical properties of high temperature titanium alloy used at 650℃ was studied.The results show that molybdenum can refine the microstructure of the alloy,and can significantly increase the room temperature strength of the material without significantly reducing the room ductility intensively.But it has no significant effect on the elevated temperature strength and ductility at 650℃.Endurance and creep property of this alloy are dependent on the microstructure and testing temperature.In some sense,the volume fraction of priorαphase in the microstructure has a larger contribution to the endurance and creep property than molybdenum element for this alloy.Based on this work,a suggested treatment for this alloy with favorable heat endurance property is to be treated at higher solution temperature.In this case,the volume fraction of priorαin the treated microstructure was about 15%and the Mo content was 0.6%.
引文
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[14]MA F C,ZHENG B,LIU P,et al.Modeling of effects of thermomechanical processing on elevatedtemperature mechanical properties of in situ(TiB+TiC)/Ti-1100 composite[J].Journal of Materials Science,2016,51(16):7502-7511.
[15]COLLINGS E W,WELSCH G.Materials properties handbook:titanium alloys[M].Materials Park:ASM International,1994.
[2]魏寿庸,何瑜,王青江,等.俄航空发动机用高温钛合金发展综述[J].航空发动机,2005,31(1):52-58.
[3]张喜燕,赵永庆,白晨光.钛合金及应用[M].北京:化学工业出版社,2005.
[4]赵永庆.高温钛合金研究[J].钛工业进展,2001,18(1):33-39.
[5]王清江,刘建荣,杨锐.高温钛合金的现状与前景[J].航空材料学报,2014,34(4):1-26.
[6]卢金文,赵永庆,葛鹏,等.合金元素Mo对钛合金相析出行为的影响[J].钛工业进展,2012,29(2):10-14.
[7]麻西群,孙巧艳,曹伟产,等.α钛合金在室温和低温的冲击韧性[J].稀有金属快报,2006,26(5):18-21.
[8]张久来,魏海荣.添加少量β稳定元素对纯钛室温拉伸性能的影响[J].稀有金属,1997,21(增刊1):48-52.
[9]魏寿庸,石卫民,郭佳林,等.β稳定元素Mo对600℃高温钛合金组织和性能的影响[J].中国有色金属学报,2013,23(增刊1):120-124.
[10]MA F C,LU S Y,LIU P,et al.Evolution of strength and fibers orientation of a short-fibers reinforced Timatrix composite after extrusion[J].Materials&Design,2017,126:297-304.
[11]MA F C,LU S Y,LIU P,et al.Microstructure and mechanical properties variation of TiB/Ti matrix composite by thermo-mechanical processing in beta phase field[J].Journal of Alloys and Compounds,2017,695:1515-1522.
[12]MA F C,ZHOU J J,LIU P,et al.Strengthening effects of TiC particles and microstructure refinement in situ TiC-reinforced Ti matrix composites[J].Materials Characterization,2017,127:27-34.
[13]MA F C,LIU P,LI W,et al.The mechanical behavior dependence on the TiB whisker realignment during hot-working in titanium matrix composites[J].Scientific Reports,2016,6:36126.
[14]MA F C,ZHENG B,LIU P,et al.Modeling of effects of thermomechanical processing on elevatedtemperature mechanical properties of in situ(TiB+TiC)/Ti-1100 composite[J].Journal of Materials Science,2016,51(16):7502-7511.
[15]COLLINGS E W,WELSCH G.Materials properties handbook:titanium alloys[M].Materials Park:ASM International,1994.