机械工程材料
機械工程材料
궤계공정재료
Materials for Mechanical Engineering
2015年
10期
101-105
,共5页
TC21钛合金%时效温度%析出α相%长大速率
TC21鈦閤金%時效溫度%析齣α相%長大速率
TC21태합금%시효온도%석출α상%장대속솔
TC21 titanium alloy%aging temperature%αphase precipitation%growth rate
为研究 TC21钛合金时效时析出α相的长大动力学，采用 JMatPro 软件模拟计算得到了钛合金时效相平衡时α相和β相的化学成分与时效温度的关系，计算得到了在500~900℃下等温时效时析出α相的长大速率与温度的关系式，并进行了试验验证。结果表明：在750℃以下等温时效时，析出α相的长大速率较慢，时效温度高于800℃时，长大速率随温度升高而迅速增加，这是由合金元素的扩散系数随温度的变化而决定的；试验得到的 TC21钛合金在900℃等温时效时析出α相的长大速率与模拟计算得到的结果一致，析出α相的生长速率随温度升高不断增大。
為研究 TC21鈦閤金時效時析齣α相的長大動力學，採用 JMatPro 軟件模擬計算得到瞭鈦閤金時效相平衡時α相和β相的化學成分與時效溫度的關繫，計算得到瞭在500~900℃下等溫時效時析齣α相的長大速率與溫度的關繫式，併進行瞭試驗驗證。結果錶明：在750℃以下等溫時效時，析齣α相的長大速率較慢，時效溫度高于800℃時，長大速率隨溫度升高而迅速增加，這是由閤金元素的擴散繫數隨溫度的變化而決定的；試驗得到的 TC21鈦閤金在900℃等溫時效時析齣α相的長大速率與模擬計算得到的結果一緻，析齣α相的生長速率隨溫度升高不斷增大。
위연구 TC21태합금시효시석출α상적장대동역학，채용 JMatPro 연건모의계산득도료태합금시효상평형시α상화β상적화학성분여시효온도적관계，계산득도료재500~900℃하등온시효시석출α상적장대속솔여온도적관계식，병진행료시험험증。결과표명：재750℃이하등온시효시，석출α상적장대속솔교만，시효온도고우800℃시，장대속솔수온도승고이신속증가，저시유합금원소적확산계수수온도적변화이결정적；시험득도적 TC21태합금재900℃등온시효시석출α상적장대속솔여모의계산득도적결과일치，석출α상적생장속솔수온도승고불단증대。
In order to study the growth kinetics ofαphase precipitation in TC21 titanium alloy during ageing treatment,the relationship between the elemental composition ofβandαphase and aging temperature was obtained using JMatPro software.The equation between the αphase growth rate and aging temperature of 500-900 ℃ was also obtained by calculation and verified by experiment.The results show that when the aging temperature was below 750 ℃,the αphase growth rate increased slowly,while the temperature higher than 800 ℃,the growth rate increased rapidly with temperature rising,as the element diffusion coefficient increased with the aging temperature rising.The α phase growth rate obtained by observing the microstructure of TC21 titanium alloy after isothermal aged at 900 ℃ was consistent with the simulated result.Theαphase growth rate increased with the increase of aging temperature.
