Transactions of Materials and Heat Treatment

Title：Study on recrystallization of earth anchor rods after mosaic forging

Authors： Zhang Louying Shu Xiyong Sun Shaodong Zhang Dianju Zhang Mingsheng

Unit： Huaian College of Information Technology Huaian Innovative Automation Equipment Co. Ltd.

KeyWords： earth anchor rod metal recrystallization mosaic forging utility strength

ClassificationCode：TG316

year,vol(issue):pagenumber：2016,41(2):17-20

Abstract：

For corrosion resistance of earth anchor rods, the necessity of mosaic forging was investigated. Tensile tests show that the utility strength of earth anchor rods is below 28.8 kN after mosaic forging, and failed to satisfy the design standard. Furthermore, the fracture occurs in the mosaic forging part of anchor rods near to the shackle porthole. The microstructure of anchor rods was examined by optical microscope (OM). The results show that the elongated grains induced by cold deformation transform into equiaxed grains after mosaic forging, where recrystallization occurs. Thus, work hardening after cold deformation disappears which resulting in the degradation of utility strength. Then, it is believed that the temperature rise caused by heat conduction from the shackle is the main reason for recrystallization. Therefore, with earth anchor rods dip coating into mixed liquid with fixed proportion before mosaic forging, the temperature after mosaic forging decreases below the recrystallization temperature. The following tensile tests show that no obvious degradation in utility strength is observed after mosaic forging. At the same time, recrystallization is also not found by OM.

Funds：

淮安市科技支撑计划项目（KA140205）

张楼英(1968-)，女，硕士，副教授

Reference：

[1] 李谋成, 林海潮, 曹楚南. 碳钢在土壤中腐蚀的电化学阻抗谱特征[J]. 中国腐蚀与防护学报, 2000, 20(2):111-117.Li M C, Lin H C, Cao C N. Study on soil corrosion of carbon steel by electrochemical impedance spectroscopy(EIS)[J]. Journal of Chinese Society for Corrosion and Protection, 2000, 20(2):111-117.

[2] 赵麦群, 雷阿丽. 金属的腐蚀与防护[M]. 北京:国防工业出版社, 2013.Zhao M Q, Lei A L. Corrosion and Protection of Steel[M]. Beijing: National Defend Industry Press, 2013.

[3] 王文忠. 钢铁件热镀锌[J]. 电镀与环保，2002, 22(2):15-16.Wang W Z. Hot dip galvanization of iron and steel[J]. Electroplating and Pollution Control, 2002, 22(2):15-16.

[4] 于宏, 田素贵, 耿新,等. 冷变形CrMo钢系列温度退火后的组织与性能[J]. 沈阳工业大学学报, 2001, 23(6):459-462.Yu H, Tian S G, Geng X, et al. Structure and properties of CrMo steel annealed in series of temperatures after cool deformation[J]. Journal of Shenyang University of Technology, 2001, 23(6):459-462.

[5] 李伟, 刘平, 马凤仓, 等. 时效与冷变形对Cu-Ni-Si 合金微观组织和性能的影响[J]. 稀有金属, 2011, 35(3):330-335.Li W, Liu P, Ma F C, et al. Effects of aging and cold deformation on microstructure and properties for Cu-Ni-Si alloy[J]. Chinese Journal of Rare Metals, 2011, 35(3):330-335.

[6] 伍来智, 陈军, 张鸿冰. 40Cr钢奥氏体动态再结晶及晶粒细化[J]. 上海交通大学学报, 2008, 42(5):786-790.Wu L Z, Chen J, Zhang H B. Dynamic recrystallization of austenite and grain refinement in 40Cr steel[J]. Journal of Shanghai Jiaotong University, 2008, 42(5):786-790.

[7] 李佳, 张秀芝, 刘建生.低合金钢Q345E高温热变形行为及动态再结晶图[J]. 锻压技术, 2013, 38(4):148-151.Li J, Zhang X Z, Liu J S. Hot deformation behavior and dynamic recrystallization diagram for low alloy Q345 steel at high temperature [J]. Forging ＆ Stamping Technology, 2013, 38(4):148-151.

[8] 杜敬霞, 李洪波, 张艳姝,等. 300 M高强钢的热变形本构关系研究[J]. 锻压技术, 2014 , 39(8):109-114.Du J X, Li H B, Zhang Y S, et al. Investigation on constitutive relationship of 300 M high strength steel during hot deformation[J]. Forging ＆ Stamping Technology, 2014, 39(8):109-114.

[9] 田素贵, 于宏, 耿新. 冷变形钢的再结晶温度及其影响因素[J]. 钢铁研究学报, 2003, 15(1):42-45.Tian S G, Yu H, Geng X. Recrystallization temperature of cold deformed steel and its influencing factors [J]. Journal of Iron and Steel Research, 2003, 15(1):42-45.

Service：

【This site has not yet opened Download Service】【Add Favorite】