Ti80合金中厚板沿厚度方向组织与性能的不均匀分布
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摘要
研究了Ti80合金中厚板沿厚度方向组织与性能分布的不均匀性。结果表明,热轧态Ti80合金中厚板表层晶粒被充分拉长破碎,且越靠近中心,晶粒破碎程度越低,等轴α晶粒越多。退火后板材表层具有较多的等轴α以及晶界α相,α片层组织比例较小,随着厚度加深,等轴α以及晶界α相数量逐渐减少,α片层比例明显增加,并在中心层达到最大。退火后Ti80合金中厚板表层与心部性能差异明显,表层强度及伸长率都要高于中心层,而中心层冲击性能要明显优于表层。
The microstructure and mechanical properties inhomogeneity distribution in thickness direction of Ti80 alloy medium plate was investigated. The results show that the surface grains are thoroughly broken and elongated by rolling,and the number of equiaxed α grain increases with the position nearing the center. More equiaxed α grain and grain boundary α phase are found in the surface layer,but the part of the secondary α lamellae is relatively smaller. The equiaxed α grain and grain boundary α phase decrease gradually from surface layer to the center,while the secondary α lamellae increases markedly and reaches its maximum in the center layer. After annealing,the mechanical properties between the surface and the center have a distinctive difference that the strength and ductility near the surface are greater,while the impact toughness of the center area is obviously better than the surface area.
The microstructure and mechanical properties inhomogeneity distribution in thickness direction of Ti80 alloy medium plate was investigated. The results show that the surface grains are thoroughly broken and elongated by rolling,and the number of equiaxed α grain increases with the position nearing the center. More equiaxed α grain and grain boundary α phase are found in the surface layer,but the part of the secondary α lamellae is relatively smaller. The equiaxed α grain and grain boundary α phase decrease gradually from surface layer to the center,while the secondary α lamellae increases markedly and reaches its maximum in the center layer. After annealing,the mechanical properties between the surface and the center have a distinctive difference that the strength and ductility near the surface are greater,while the impact toughness of the center area is obviously better than the surface area.
引文
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[2]孟祥军,陈春和,余巍,等.几种海洋工程用钛合金及其应用[J].中国造船,2004,45(S1):38-43.Meng Xiangjun,Chen Chunhe,Yu Wei,et al. Some kinds of marine projects use titanium alloy and its application[J]. Shipbuilding of China,2004,45(S1):38-43.
[3]王德宝,王越.高强IF钢板沿厚度方向的织构和显微组织[J].理化检验-物理分册,2010,46(6):348-351.Wang Debao,Wang Yue. Texture and microstructure of high-strength IF steel plate along thickness direction[J]. Physical Testing and Chemical Analysis(Part A:Physical Testing),2010,46(6):348-351.
[4]陈军洲,甄良,戴圣龙,等.晶粒形貌及织构对AA7055铝合金板材不同厚度层屈服强度的影响[J].稀有金属材料与工程,2008,37(11):1966-1969.Chen Junzhou,Zhen Liang,Dai Shenglong,et al. Effects of grain shape and texture on the through-thickness yield strength of AA 7055aluminum alloy plate[J]. Rare Metal Materials and Engineering,2008,37(11):1966-1969.
[5]邓超,刘施峰,姬静利,等.变形区形状参数对钽板组织均匀性的影响[J].稀有金属材料与工程,2014,43(8):2017-2022.Deng Chao,Liu Shifeng,Ji Jingli,et al. Influence of roll gap geometry on through-thickness uniformity of texture and microstructure in clockrolled tantalum[J]. Rare Metal Materials and Engineering,2014,43(8):2017-2022.
[6]李权,唐广波,刘正东,等.板带热轧变形过程中的非均匀应变问题分析[J].钢铁研究学报,2007,19(6):52-55.Li Quan,Tang Guangbo,Liu Zhengdong,et al. Analysis of nonuniform strain in hot strip rolling deformation process[J]. Journal of Iron and Steel Research,2007,19(6):52-55.
[7]毛宇成,刘施峰,范海洋,等.高纯钽交叉轧制过程中微观结构和织构梯度的演变[J].电子显微学报,2017,36(1):7-13.Mao Yucheng,Liu Shifeng,Fan Haiyang,et al. Evolution of texture gradient and microstructure of high purity tantalum in clock-rolling process[J]. Journal of Chinese Electron Microscopy Society,2017,36(1):7-13.
[8]马凡蛟,杜予晅,陈海生,等.退火工艺对Ti80合金组织与性能的影响[J].金属热处理,2012,37(4):88-91.Ma Fanjiao,Du Yuxuan,Chen Haisheng,et al. Effect of annealing process on microstructure and properties of Ti80 alloy[J]. Heat Treatment of Metals,2012,37(4):88-91.
[9]王蕊宁,王兴,邓家彬,等. TA15钛合金片层状组织的球化行为[J].热加工工艺,2014,43(22):57-59.Wang Ruining, Wang Xing, Deng Jiabin, et al. Microstructure globularization of TA15 alloy with lamellar structure[J]. Hot Working Technology,2014,43(22):57-59.
[10]万亚昌,李鑫,鲁世强,等.变形参数对TC21钛合金片层组织球化行为的影响[J].精密成形工程,2016,8(1):79-83.Wan Yachang,Li Xin,Lu Shiqiang,et al. Effect of deformation parameters on globularization behavior of titanium alloy TC21 with lamellar microstructure[J]. Journal of Netshape Forming Engineering,2016,8(1):79-83.
[11]周军,曾卫东,舒滢,等.热变形参数对Ti-17合金的片状α球化过程的影响[J].热加工工艺,2005(1):16-18.Zhou Jun,Zeng Weidong,Shu Ying,et al. Influence of hot processing parameters on globularization of lamellarαin Ti-17 alloy[J]. Hot Working Technology,2005(1):16-18.
[12]贺飞,陈海峰,王玉会,等.显微组织对TA15合金高温拉伸性能的影响[J].材料工程,2012(2):13-15.He Fei,Chen Haifeng,Wang Yuhui,et al. Effect of Microstructure on high temperature tensile properties of TA15 titanium alloy[J].Journal of Materials Engineering,2012(2):13-15.
[13]张利军,田军强,周中波,等.热处理制度对TC21钛合金锻件组织及力学性能的影响[J].中国材料进展,2009,28(9/10):84-87.Zhang Lijun,Tian Junqiang,Zhou Zhongbo,et al. Effects of heat treatment on microstructures and mechanical performances of TC21titanium alloy forgings[J]. Materials China,2009,28(9/10):84-87.
[14]段锐,蔡建明,李臻熙,等.初生α相含量对近α钛合金TG6拉伸性能和热稳定性的影响[J].航空材料学报,2007,27(3):17-22.Duan Rui,Cai Jianming,Li Zhenxi,et al. Effect of primaryαphase volume fraction on tensile property and thermal stability of near-alpha TG6 titanium alloy[J]. Journal of Aeronautical Materials,2007,27(3):17-22.
[15]张旺峰,曹春晓,李兴无,等.加载方式与初生α相对钛合金裂纹扩展行为的影响[J].钛工业进展,2004,21(4):26-29.Zhang Wangfeng,Cao Chunxiao,Li Xingwu,et al. Effect of loading mode and primaryαphase on crack propagation behavior of titanium alloy[J]. Titanium Industry Progress,2004,21(4):26-29.
[16]陈军,赵永庆,曾卫东,等.退火工艺对Ti700钛合金冲击韧性的影响[J].金属热处理,2007,32(7):69-71.Chen Jun, Zhao Yongqing, Zeng Weidong, et al. Influence of annealing process on impact toughness of Ti700 titanium alloy[J].Heat Treatment of Metals,2007,32(7):69-71.
[17]杨治军,郭爱红,吴义舟,等. Ti6321钛合金退火处理过程中组织演变及其对冲击韧性的影响[J].中国有色金属学报,2013,23(7):512-516.Yang Zhijun,Guo Aihong,Wu Yizhou,et al. Microstructure evolution of Ti6321 titanium alloy during annealing treatment and its effect on impact toughness[J]. The Chinese Journal of Nonferrous Metals,2013,23(7):512-516.