铝合金钻杆管体动态再结晶的不均匀分布研究

发布时间：2018-06-06 05:36

  本文选题：铝合金钻杆 + 等效应变　； 参考：《塑性工程学报》2017年06期

【摘要】：采用DEFORM-3D有限元分析软件,以Yada为动态再结晶模型,对Φ73 mm×9 mm双端内加厚7075铝合金钻杆管体挤压成形的动态再结晶进行模拟,研究管体上动态再结晶百分数及其晶粒平均尺寸的分布规律,通过Φ73 mm×16 mm的前端加厚段、Φ73 mm×9 mm的主体管段挤压实验得到管体各部位的金相图,以验证数值模拟结果,并经测试获得前端加厚段与主体段内、外表面维氏硬度,得到动态再结晶不均匀分布对管体力学性能的影响。结果表明:径向上,管体前端加厚段内表面最大动态再结晶百分数及其晶粒平均尺寸分别为12.56%、17.58μm,分别比外表面高5.63%、12.26%;主体段内表面的最大动态再结晶百分数及其晶粒平均尺寸分别为15.46%、16.98μm,分别比外表面低72.51%、21.93%;后端加厚段内表面最大动态再结晶体积分数及其晶粒平均尺寸分别为17.89%、19.70μm,分别比外表面低78.57%、24.55%。轴向上,随着挤压的进行,后端加厚段外表面动态再结晶百分数及其晶粒平均尺寸最大,分别达到83.48%、26.11μm;主体段动态再结晶百分数及其晶粒平均尺寸次之,分别达到56.24%、21.75μm;前端加厚段动态再结晶百分数及其晶粒平均尺寸最小,分别为13.29%、18.42μm。外表面维氏硬度较内表面增加了5.811%,主体段维氏硬度较前端加厚段增加了9.323%。
[Abstract]:The dynamic recrystallization of 桅 73 mm 脳 9 mm double end inner thickened 7075 aluminum alloy drill pipe was simulated by using DEFORM-3D finite element analysis software and Yada as dynamic recrystallization model. The distribution law of dynamic recrystallization percentage and average grain size on tube body is studied. The metallographic diagrams of various parts of tube body are obtained by extrusion experiments of 桅 73 mm 脳 16 mm front end thickening section and 桅 73 mm 脳 9 mm main tube segment, so as to verify the numerical simulation results. The Vickers hardness of the front end thickening section and the inner and outer surface of the main segment were obtained, and the effect of dynamic recrystallization uneven distribution on the mechanical properties of the pipe was obtained. The results show that: radial, The maximum dynamic recrystallization percentage and the average grain size of the inner surface of the thickened section of the tube body are 12.56 ~ 17.58 渭 m, 5.630.26 渭 m higher than those of the outer surface, respectively, and the maximum dynamic recrystallization percentage and the average grain size of the inner surface of the main segment are 15.46 渭 m and 16.98 渭 m, respectively. The maximum dynamic recrystallization volume integral number and the average grain size of the inner surface in the back-end thickening section are 17.89 and 19.70 渭 m, respectively, which are 78.57 and 24.55 渭 m lower than those on the outer surface, respectively. In axial direction, with the extrusion, the dynamic recrystallization percentage and the average grain size of the outer surface of the thickening segment are the largest, reaching 83.48 ~ 26.11 渭 m respectively, while the dynamic recrystallization percentage of the main segment and the average grain size of the main segment are the second. The dynamic recrystallization percentage and the average grain size of the front thickening section are the smallest, 13.29 and 18.42 渭 m, respectively. The Vickers hardness of the outer surface is 5.811 higher than that of the inner surface, and the Vickers hardness of the main segment is 9.32323% higher than that of the thickening section of the front end.
【作者单位】： 西南石油大学材料科学与工程学院;
【基金】：四川省教育厅重点项目(13ZA0181) 油气田材料重点实验室开放基金(X151516KCL22) 国家重点技术研发计划(2012BAF09B04)
【分类号】：TE921.2;TG146.21
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本文编号：1985365