固溶时效对Ti-5Al-3.5Fe-7Mo-4Cr合金组织与性能的影响

Effect of solution treatment and aging on microstructure and properties of Ti-5Al-3.5Fe-7Mo-4Cr alloy

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中文摘要：通过室温拉伸性能测试、EBSD、SEM、TEM及XRD等分析手段,研究了固溶时效处理对自主设计新型低成本高强β钛合金Ti-5Al-3.5Fe-7Mo-4Cr组织和拉伸性能的影响.结果表明:相比在单相区热处理,试验β钛合金在两相区进行热处理后性能更优;两种固溶处理制度下,随着时效温度的增加,次生α相析出量和合金强度均先增加后降低,伸长率呈增加趋势;时效温度较高时,针状次生α相长大,间距增大.经过820 ℃ ×0.5 h固溶和440℃×8h时效的钛合金达到良好的强-塑性匹配,抗拉强度为1257 MPa,屈服强度为1135 MPa,伸长率为4％,达到高强钛合金强度要求.试验β钛合金获得较高强度主要源于第二相强化,次生α相间距较小、α相体积分数增加和分层次尺寸结构对合金起到显著的强化效果.

外文摘要：A novel low-cost high-strength β titanium alloy Ti-5Al-3.5Fe-7Mo-4Cr was self-designed,and the effect of solution treatment and aging on its microstructure and tensile properties was investigated by means of room temperature tensile testing,EBSD,SEM,TEM and EDS analysis.The results show that compared with that solution treat in single-phase region and aging,the properties of the alloy solution treated in α+β two phase region and aged are better.Under these two different solution treatment systems,as the aging temperature increases,the precipitation amount of secondary α phase and strength of the alloy both increase first and then decrease,while the elongation shows an increasing trend.When the aging temperature is higher,the needle-like secondary α phase grows and its interspacing increases.After solution treatment at 820 ℃ for 0.5 h and aging at 440 ℃ for 8 h,the tested titanium alloy achieves good strength-plasticity match,with the tensile strength of 1257 MPa,yield strength of 1135 MPa,and elongation of 4％,meeting the strength requirements of high-strength titanium alloys.The high strength of the tested β titanium alloy is mainly due to the second phase strengthening,smaller secondary αphase interspacing,the increase in volume fraction of α phase and hierarchical size structure having a significant strengthening effect on the alloy.

外文关键词：

Ti-Al-Fe-Mo-Cr β titanium alloysolution treatment and agingmicrostructuretensile properties

作者：

赵倩、董福宇、吴福川、张悦、徐欣

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作者单位：

扬州市职业大学机械工程学院,江苏扬州 225012

沈阳工业大学材料科学与工程学院,辽宁沈阳 110870

关键词：

Ti-Al-Fe-Mo-Cr β钛合金固溶时效组织拉伸性能

基金：

辽宁省教育厅基本科研项目辽宁省自然科学基金江苏省科技副总项目沈阳市中青年创新支持计划扬职大优秀青年骨干教师资助项目扬职大科研项目

项目编号：

LJKMZ202204662021-KF-15-01FZ20211306LQGD20190012023XJ11

出版年：

2024

DOI：

10.13251/j.issn.0254-6051.2024.05.016

金属热处理

北京机电研究所中国机械工程学会热处理学会中国热处理行业协会

金属热处理

CSTPCD北大核心

影响因子：0.546

ISSN：0254-6051

年,卷(期)：2024.49(5)