固溶處理對近β鍛TC21合金組織的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-01-18
通過對TC21合金進(jìn)行近β鍛，獲得典型的雙態(tài)組織。通過X射線衍射(XRD)、光學(xué)顯微鏡(OM)和掃描電鏡(SEM)分析了固溶處理對雙態(tài)TC21合金組織的影響。
固溶處理對近β鍛TC21合金組織的影響Effect of solution treatment on?morphology of near β forged TC21 alloy通過對TC21合金進(jìn)行近β鍛，獲得典型的雙態(tài)組織。通過X射線衍射(XRD)、光學(xué)顯微鏡(OM)和掃描電鏡(SEM)分析了固溶處理對雙態(tài)TC21合金組織的影響。XRD分析表明：隨著固溶溫度的降低，TC21合金固溶水冷處理后的亞穩(wěn)定相組成依次為α″(≥Tβ)、α+α″(Tβ≈935 ℃)、α+α″+β(915、855 ℃)、α+β(≤835 ℃)。分別對TC21合金進(jìn)行895 ℃, 2 h，AC、QFC(慢爐冷)、FC+(610 ℃, 4 h，AC)熱處理，研究固溶冷卻速率對合金組織性能的影響。結(jié)果表明：隨著冷卻速率的增加，等軸α相基本保持不變，次生α相含量減少，合金強(qiáng)度增加，塑性減小。此外，分別對TC21合金在915、905、895、870和835 ℃進(jìn)行2 h, AC固溶處理，金相分析表明：隨著固溶溫度的降低，等軸α相相含量及尺寸基本保持不變，次生α條所占比例增加，α條變寬。
Two-state microstructure of TC21 alloy was obtained by near β forging process. The effect of different solution treatments on the microstructure of TC21 alloy was analyzed by X-ray diffractometry (XRD), optical microscopy (OM) and electron microscopy (SEM). The XRD analysis reveals that with the decrease of solution treatment temperature, the phase compositions of TC21 alloy are α″ (≥Tβ), α+α″(Tβ≈935 ℃), α+α″+β (915, 855 ℃), α+β (≤835 ℃). The morphology and mechanical properties of TC21 alloy solution treated at 895 ℃ for 2 h with different solution cooling rate (air cooling, quick furnace cooling, furnace cooling) and then aged by 610 ℃, 4 h, AC was analyzed. As a result, with the increase of solution cooling rate, there is no obvious change on the primary equiaxed α phase, the content of secondary α phase decreases, the strength of the alloy increases, and the plasticity decreases at the same time. TC21 alloy was solution treated at 915, 905, 895, 870 and 835 ℃ for 2 h followed by air cooling, respectively. With the decrease of solution treatment temperature, the width and content of lamellar α phase increase, and there is no difference between the equiaxed α phase of TC21 alloy solution treated at different temperatures.
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