中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2014年
3期
682-689
,共8页
彭小娜%郭鸿镇%石志峰%秦春%赵张龙
彭小娜%郭鴻鎮%石誌峰%秦春%趙張龍
팽소나%곽홍진%석지봉%진춘%조장룡
TC4-DT钛合金%热机械处理%显微组织%拉伸性能
TC4-DT鈦閤金%熱機械處理%顯微組織%拉伸性能
TC4-DT태합금%열궤계처리%현미조직%랍신성능
TC4-DT titanium alloy%thermomechanical treatment%microstructures%tensile properties
研究热机械处理(两相区变形加普通退火、双重退火、固溶时效以及三重退火)对 TC4-DT 钛合金组织和力学性能的影响。结果表明，热机械处理对显微组织参数影响显著，随着退火和时效温度的升高及冷却速度的降低，初生α相的体积分数和原始β晶粒的尺寸降低，而晶界α和次生α相的宽度却升高。由于固溶时效处理获得了大量的β转变组织和细小的晶界α相和次生α相，合金强度最高，但伸长率不及其它条件的，其断裂强度、屈服强度、伸长率和断面收缩率分别为1100 MPa、1030 MPa、13%和53%，双重退火获得了良好的强度和塑性匹配，合金力学性能分别为940 MPa、887.5 MPa、15%和51%。组织参数和性能的关系表明，随着β转变组织的增多和原始β晶粒尺寸的增大，材料的强度和断面收缩率升高，而晶界α相和二次α相的宽度对力学性能的影响却呈相反趋势。此外，晶界α相含量的减少和原始β晶粒尺寸的降低有助于塑性的提高。
研究熱機械處理(兩相區變形加普通退火、雙重退火、固溶時效以及三重退火)對 TC4-DT 鈦閤金組織和力學性能的影響。結果錶明，熱機械處理對顯微組織參數影響顯著，隨著退火和時效溫度的升高及冷卻速度的降低，初生α相的體積分數和原始β晶粒的呎吋降低，而晶界α和次生α相的寬度卻升高。由于固溶時效處理穫得瞭大量的β轉變組織和細小的晶界α相和次生α相，閤金彊度最高，但伸長率不及其它條件的，其斷裂彊度、屈服彊度、伸長率和斷麵收縮率分彆為1100 MPa、1030 MPa、13%和53%，雙重退火穫得瞭良好的彊度和塑性匹配，閤金力學性能分彆為940 MPa、887.5 MPa、15%和51%。組織參數和性能的關繫錶明，隨著β轉變組織的增多和原始β晶粒呎吋的增大，材料的彊度和斷麵收縮率升高，而晶界α相和二次α相的寬度對力學性能的影響卻呈相反趨勢。此外，晶界α相含量的減少和原始β晶粒呎吋的降低有助于塑性的提高。
연구열궤계처리(량상구변형가보통퇴화、쌍중퇴화、고용시효이급삼중퇴화)대 TC4-DT 태합금조직화역학성능적영향。결과표명，열궤계처리대현미조직삼수영향현저，수착퇴화화시효온도적승고급냉각속도적강저，초생α상적체적분수화원시β정립적척촌강저，이정계α화차생α상적관도각승고。유우고용시효처리획득료대량적β전변조직화세소적정계α상화차생α상，합금강도최고，단신장솔불급기타조건적，기단렬강도、굴복강도、신장솔화단면수축솔분별위1100 MPa、1030 MPa、13%화53%，쌍중퇴화획득료량호적강도화소성필배，합금역학성능분별위940 MPa、887.5 MPa、15%화51%。조직삼수화성능적관계표명，수착β전변조직적증다화원시β정립척촌적증대，재료적강도화단면수축솔승고，이정계α상화이차α상적관도대역학성능적영향각정상반추세。차외，정계α상함량적감소화원시β정립척촌적강저유조우소성적제고。
Influence of thermomechanical treatments (mill annealing, duplex annealing, solution treatment plus aging and triple annealing) on microstructures and mechanical properties of TC4-DT titanium alloy was investigated. Results showed that thermomechanical treatments had a significant influence on the microstructure parameters and higher annealing and aging temperature and lower cooling rate led to the decrease of the volume fraction of primaryαand the size of prior-βand the increase of the width of grain boundary αand secondary α. The highest strength was obtained by solution treatment and aging due to a large amount of transformedβand finer grain boundaryαand secondaryαat the expense of slight decrease of elongation and the ultimate strength, yield strength, elongation, reduction of area were 1100 MPa, 1030 MPa, 13%and 53%separately. A good combination of strength and ductility has been obtained by duplex annealing with the above values 940 MPa, 887.5 MPa, 15%and 51%respectively. Analysis between microstructure parameters and tensile properties showed that with the volume fraction of transformedβphase and the prior-βgrain size increasing, the ultimate strength, yield strength and reduction of area increased, but the elongation decreased. While the width of grain boundary α and secondary α showed a contrary effect on the tensile properties. Elimination of grain boundaryαas well as small prior-βgrain size can also improve ductility.
