Microstructure and mechanical properties of friction stir processed hypoeutectoid steel

被引：0
作者：
Wang H. [1 ,2 ]
Wang W. [1 ]
Li X. [2 ]
Wang K. [1 ]
机构：
[1] College of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an
[2] School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2018年 / 39卷 / 10期
关键词：
Friction stir processing; Hypoeutectoid steel; Mechanical properties; Microstructure;
D O I：
10.12073/j.hjxb.2018390246
中图分类号：
学科分类号：
摘要：
The hot-rolled annealed hypoeutectoid steel plates with a thickness of 3 mm was processed by friction stir processing using K40 cobalt tungsten carbide tool. The microstructures and mechanical properties of the processed zone were investigated. The results show that the microstructure of stir zone and thermo-mechanically affected zone were proeutectoid blocky ferrite, "acicular ferrite" and pearlite. Its transformation characteristic was dynamic recrystallization and phase transformation. However, heat-affected zone was characterized as equiaxed ferrite and lamellar pearlite, which was mainly controlled by recrystallization. Friction stir processing had significant effect on the morphologies of pearlite and the precipitation cementite in above different zones. Microhardness in the processed zone of hypoeutectoid steel sample obviously increased after friction stir processing and its ultimate tensile strength increased by 8.2% compared to that of the base material. As a result, the fracture location of tensile specimens appeared at the base material. The fracture mechanism of samples before and after friction stir processing treatment was dimple ductile fracture. Solid solution strengthening and phase transformation strengthening were the two factors for improving the hardness and the ultimate tensile strength of hypoeuectoid steel sample. © 2018, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
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页码：41 / 47
页数：6
相关论文
共 12 条
  • [1] Mishra R.S., Ma Z.Y., Friction stir welding and processing, Materials Science & Engineering R Reports, 50, 1, pp. 1-78, (2005)
  • [2] Gao X., Zhang Z., Wang K., Et al., The latest research progress of stirring friction processing on the superplastic magnesium alloy, Materials Review, 28, 5, pp. 138-142, (2014)
  • [3] Rai R., De A., Bhadeshia H.K.D.H., Et al., Review: friction stir welding tools, Science & Technology of Welding & Joining, 16, 4, pp. 325-342, (2011)
  • [4] Grewal H.S., Singh H., Agrawal A., Et al., Friction stir processing of mild steel to enhance its surface hardness, Advanced Materials Research, 620, pp. 117-121, (2012)
  • [5] Wang W., Wang Y., Gao D., Et al., Analysis of metallographic structure for low carbon steel Q235A welded joints by friction stir welding, Aerospace Manufacturing Technology, 5, pp. 42-44, (2005)
  • [6] Jafarzadegan M., Abdollah-Zadeh A., Feng A.H., Et al., Microstructure and mechanical properties of a dissimilar friction stir weld between austenitic stainless steel and low carbon steel, Journal of Materials Science Technology, 29, 4, pp. 367-372, (2013)
  • [7] Fu Z., He D., Zhou P., Et al., Structure investigation of friction stir welding of 7A52 aluminum alloy t, Transactions of the China Welding Institution, 27, 5, pp. 65-68, (2006)
  • [8] Zhao Y.H., Lin S.B., Shen J.J., Et al., 3D visualization of the material flow in friction stir welding process, China Welding, 14, 2, pp. 140-144, (2005)
  • [9] Lienert T.J., Jr W.L.S., Grimmett B.B., Et al., Friction stir welding studies on mild steel, Welding Journal, 29, 7, pp. 27-40, (2003)
  • [10] Liu L., Cai L., Zhao M., Et al., Formation of needle like proeutectiod ferrite and its influence on medium carbon steel wire properties, Material Science and Technology, 13, 6, pp. 659-661, (2005)
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