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Ti-662鈦合金棒材的組織和性能
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時(shí)間：2015-08-27
對(duì)Ti-662鈦合金棒材進(jìn)行鍛造、固溶及時(shí)效處理，利用光學(xué)顯微鏡、SEM 及力學(xué)性能試驗(yàn)對(duì)該合金3種狀態(tài)下的顯微組織和力學(xué)性能進(jìn)行研究。
Ti-662鈦合金棒材的組織和性能Microstructure and properties of Ti-662 alloy bars
對(duì)Ti-662鈦合金棒材進(jìn)行鍛造、固溶及時(shí)效處理，利用光學(xué)顯微鏡、SEM
及力學(xué)性能試驗(yàn)對(duì)該合金3種狀態(tài)下的顯微組織和力學(xué)性能進(jìn)行研究。結(jié)果表明：Ti-662鈦合金鍛棒的組織為初生等軸α+β轉(zhuǎn)變組織，其強(qiáng)度較高，伸長(zhǎng)率較大，抗拉強(qiáng)度達(dá)到1
149
MPa，伸長(zhǎng)率為16.5%；合金經(jīng)固溶熱處理后初生α相明顯增多，主要組織為初生α相、馬氏體轉(zhuǎn)變的α′相和亞穩(wěn)β相，合金強(qiáng)度和伸長(zhǎng)率有所降低，但斷面收縮率有所提高，說(shuō)明固溶處理有一定的軟化作用；經(jīng)固溶處理后的棒材在時(shí)效處理過(guò)程中，亞穩(wěn)態(tài)組織析出細(xì)小彌散的次生α相，使合金強(qiáng)度明顯強(qiáng)化，塑性略有降低，且隨著時(shí)效溫度的升高，強(qiáng)化效果下降，塑性隨之提高。
The microstructure and properties of Ti-662 alloy under
three conditions were investigated by using optical microscopy (OM), scanning
electron microscopy (SEM) and measurements of mechanical properties for the bars
processed by forging, solution and aging treatment. The results show that the
as-forged microstructures of Ti-662 alloy bars are fine isothermal primary α and
transition β phases, the strength and elongation are higher, the tensile
strength and elongation of the alloy are 1 149 MPa and 16.5%, respectively.
After solution heat treatment, the quantity of primary α phase of the alloy
increases significantly, and the microstructures are mainly composed of
isothermal primary α, martensite α′ and metastable β phases. The strength and
elongation decrease, but the reduction of area increases, which indicate that
solution treatment has a softening effect. Fine dispersion secondary α phase
precipitates from the metastable structures after solution and in aging process,
and the alloy can be strengthened significantly with slightly reduced
plasticity. With the increase of the aging temperature, the strengthening effect
reduces, and the plasticity increases.
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