机械工程材料
機械工程材料
궤계공정재료
Materials for Mechanical Engineering
2015年
11期
14-17
,共4页
钛合金%拉伸性能%固溶温度%时效温度
鈦閤金%拉伸性能%固溶溫度%時效溫度
태합금%랍신성능%고용온도%시효온도
titanium alloy%tensile property%solid-solution temperature%aging temperature
对Ti55531合金棒材和锻件进行不同工艺的固溶和时效热处理，研究了热处理工艺对其显微组织和拉伸性能的影响。结果表明：随着固溶温度升高(575~650℃)，棒材中的初生α相由颗粒状变为条状或短棒状，直至全部变为β晶粒，室温抗拉强度和屈服强度明显增大，伸长率和断面收缩率大幅下降；随着时效温度降低，短棒状或条状α相逐渐溶解并球化析出α颗粒，室温抗拉强度和屈服强度明显增大，伸长率和断面收缩率显著降低；为使钛合金棒材的室温强度和塑性达到最佳匹配，固溶温度应控制在相变点以下，时效温度宜选择在600~620℃区间；固溶温度在相变点以下，时效温度为600℃时，锻件的强度和塑性可满足相关标准的要求。
對Ti55531閤金棒材和鍛件進行不同工藝的固溶和時效熱處理，研究瞭熱處理工藝對其顯微組織和拉伸性能的影響。結果錶明：隨著固溶溫度升高(575~650℃)，棒材中的初生α相由顆粒狀變為條狀或短棒狀，直至全部變為β晶粒，室溫抗拉彊度和屈服彊度明顯增大，伸長率和斷麵收縮率大幅下降；隨著時效溫度降低，短棒狀或條狀α相逐漸溶解併毬化析齣α顆粒，室溫抗拉彊度和屈服彊度明顯增大，伸長率和斷麵收縮率顯著降低；為使鈦閤金棒材的室溫彊度和塑性達到最佳匹配，固溶溫度應控製在相變點以下，時效溫度宜選擇在600~620℃區間；固溶溫度在相變點以下，時效溫度為600℃時，鍛件的彊度和塑性可滿足相關標準的要求。
대Ti55531합금봉재화단건진행불동공예적고용화시효열처리，연구료열처리공예대기현미조직화랍신성능적영향。결과표명：수착고용온도승고(575~650℃)，봉재중적초생α상유과립상변위조상혹단봉상，직지전부변위β정립，실온항랍강도화굴복강도명현증대，신장솔화단면수축솔대폭하강；수착시효온도강저，단봉상혹조상α상축점용해병구화석출α과립，실온항랍강도화굴복강도명현증대，신장솔화단면수축솔현저강저；위사태합금봉재적실온강도화소성체도최가필배，고용온도응공제재상변점이하，시효온도의선택재600~620℃구간；고용온도재상변점이하，시효온도위600℃시，단건적강도화소성가만족상관표준적요구。
Heat treatement processes with different solid-solution and aging temperatures were carried on Ti5 5 5 3 1 titanium alloy bar and forging,and the effects of heat treatment processes on microstructure and tensile properties were studied.Results show that,with the increase of solid-solution temperature from 575 ℃ to 650 ℃, primaryαphase in bar changed from granulated shape to strip or short bar-like,and until to change toβgrains.The tensile strength and yield strength at room temperature obviously increased,the elongation and reduction of area dropped sharply with the increase of solid-solution temperature.With the decrease of aging temperature,the strip or short bar-likeαphase gradually dissolved and precipitated with granulated shape,and tensile strength and yield strength at room temperature obviously increased and elongation and reduction of area sharply decreased.In order to obtain a best match between strength and plasticity for the bar,the solid-solution temperature should below the phase transition point and aging temperature within the range of 600 ℃ to 620 ℃.Strength and plasticity of the forging could meet the requiements of relavant standard when the solid solution temperature was below phase transition point and aging temperature was 600 ℃.
