厚板TC4鈦合金電子束焊接頭組織演變規(guī)律
發(fā)布時(shí)間：2018-11-06 10:52
【摘要】：針對(duì)厚板TC4鈦合金電子束焊接頭組織不均勻性,研究焊接熱輸入對(duì)20 mm厚TC4鈦合金的電子束焊接頭組織演變規(guī)律的影響.結(jié)果表明,采用中等熱輸入時(shí),鈦合金接頭在熔寬和熔深方向均存在較大的不均勻性,接頭上部的晶粒尺寸均大于中部和下部,焊縫上部和中部生成了晶間α相和粗大的魏氏組織,增加焊縫脆性,降低焊縫塑性.增大焊接熱輸入會(huì)使晶粒和組織粗化,但是可以減小組織的不均勻性;而減小焊接熱輸入,會(huì)使晶粒和組織細(xì)化,但是組織不均勻性增大,且增加了氣孔的數(shù)量.焊縫組織的不均勻性會(huì)導(dǎo)致力學(xué)性能的梯度較大,焊縫組織越粗大,抗拉強(qiáng)度越小.
[Abstract]:The effect of welding heat input on the microstructure evolution of electron beam welding joint of thick TC4 titanium alloy was studied in the light of the inhomogeneity of electron beam welding joint of thick plate TC4 titanium alloy, and the effect of welding heat input on microstructure evolution of electron beam welding joint of 20 mm thick TC4 titanium alloy was studied. The results show that the inhomogeneity of the width and penetration direction of the titanium alloy joint is larger than that of the middle part and the lower part of the joint, and the grain size of the upper part of the joint is larger than that of the middle part and the lower part of the joint. In the upper and middle part of the weld, the intergranular 偽 phase and the coarse Weiss structure are formed, which increases the brittleness of the weld and reduces the plasticity of the weld. Increasing welding heat input will coarsening the grain and microstructure, but it can reduce the inhomogeneity of microstructure, while decreasing welding heat input will refine the grain and microstructure, but increase the inhomogeneity of microstructure and increase the number of pores. The inhomogeneity of weld microstructure leads to a larger gradient of mechanical properties, and the larger the weld microstructure, the smaller the tensile strength.
【作者單位】： 南昌航空大學(xué)輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;
【基金】：輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室開(kāi)放基金(gf201501005) 南昌航空大學(xué)研究生創(chuàng)新專項(xiàng)資金(YC2015030)
【分類號(hào)】：TG457.19
[Abstract]:The effect of welding heat input on the microstructure evolution of electron beam welding joint of thick TC4 titanium alloy was studied in the light of the inhomogeneity of electron beam welding joint of thick plate TC4 titanium alloy, and the effect of welding heat input on microstructure evolution of electron beam welding joint of 20 mm thick TC4 titanium alloy was studied. The results show that the inhomogeneity of the width and penetration direction of the titanium alloy joint is larger than that of the middle part and the lower part of the joint, and the grain size of the upper part of the joint is larger than that of the middle part and the lower part of the joint. In the upper and middle part of the weld, the intergranular 偽 phase and the coarse Weiss structure are formed, which increases the brittleness of the weld and reduces the plasticity of the weld. Increasing welding heat input will coarsening the grain and microstructure, but it can reduce the inhomogeneity of microstructure, while decreasing welding heat input will refine the grain and microstructure, but increase the inhomogeneity of microstructure and increase the number of pores. The inhomogeneity of weld microstructure leads to a larger gradient of mechanical properties, and the larger the weld microstructure, the smaller the tensile strength.
【作者單位】： 南昌航空大學(xué)輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;
【基金】：輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室開(kāi)放基金(gf201501005) 南昌航空大學(xué)研究生創(chuàng)新專項(xiàng)資金(YC2015030)
【分類號(hào)】：TG457.19
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