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雙重退火對BTi-6431S合金板材組織與性能的影響
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更新時(shí)間：2015-09-09
采用光學(xué)顯微鏡、室溫和高溫拉伸實(shí)驗(yàn)研究熱處理對BTi-6431S合金板材微觀組織和力學(xué)性能的影響。
雙重退火對BTi-6431S合金板材組織與性能的影響Effect of double annealing on microstructure and mechanical properties of BTi-6431S plate
采用光學(xué)顯微鏡、室溫和高溫拉伸實(shí)驗(yàn)研究熱處理對BTi-6431S合金板材微觀組織和力學(xué)性能的影響。結(jié)果表明：升高第一階段的退火溫度，塊狀初生α相粗化，趨于等軸狀，體積分?jǐn)?shù)逐漸降低。β相和次生α相的體積分?jǐn)?shù)增加。室溫強(qiáng)度和塑性變化不大。高溫強(qiáng)度隨第一級(jí)退火溫度的升高而逐漸上升，塑性下降。在相同第一階段退火溫度下，第二階段退火溫度的升高使得初生α相含量急劇增加，趨于板條狀，β轉(zhuǎn)變組織含量降低，室溫和高溫拉伸性能同時(shí)下降。通過合理的控制雙重退火的溫度，可使BTi-6431S合金具有良好的高溫強(qiáng)度和室溫塑性的匹配。
The influence of variant heat treatment processing (double annealing) on the microstructure and mechanical properties of the BTi-6431S plate were investigated by optical microscope and tensile tests at room and elevated temperatures. The results show that, with the first stage annealing temperature increasing, the shape of primary α phase (αp) becomes coarse, changes into equiaxial, and its volume fraction decreases gradually, while the volume fractions of β-matrix (βt) and secondary α phase increase. The room temperature strength and ductility have not obvious variation, but the high temperature strength increases and the ductility decreases. However, after the first annealing at the same temperature, increasing secondary aging temperature promotes αp?transforming into lath-shape, meanwhile reducing the volume fraction of βt, resulting in the mechanical properties decreasing. The best alloy microstructure with good high temperature strength and room temperature plasticity can be obtained by choosing double annealing temperature parameter reasonably.
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