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亚共析钢搅拌摩擦加工组织与力学性能

王洪铎,王文,李霄,王快社

王洪铎,王文,李霄,王快社. 亚共析钢搅拌摩擦加工组织与力学性能[J]. 焊接学报, 2018, 39(10): 41-47. DOI: 10.12073/j.hjxb.2018390246
引用本文: 王洪铎,王文,李霄,王快社. 亚共析钢搅拌摩擦加工组织与力学性能[J]. 焊接学报, 2018, 39(10): 41-47. DOI: 10.12073/j.hjxb.2018390246
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WANG Hongduo, WANG Wen, LI Xiao, WANG Kuaishe. Microstructure and mechanical properties of friction stir processed hypoeutectoid steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(10): 41-47. DOI: 10.12073/j.hjxb.2018390246
Citation: WANG Hongduo, WANG Wen, LI Xiao, WANG Kuaishe. Microstructure and mechanical properties of friction stir processed hypoeutectoid steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(10): 41-47. DOI: 10.12073/j.hjxb.2018390246
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亚共析钢搅拌摩擦加工组织与力学性能

Microstructure and mechanical properties of friction stir processed hypoeutectoid steel

摘要

    摘要
  • 摘要: 采用K40钨钴硬质合金搅拌头对3 mm厚热轧退火态亚共析钢板进行了搅拌摩擦加工，对加工区域的宏观形貌、微观组织及力学性能进行了分析．结果表明，搅拌区和热力影响区为先共析块状铁素体、“针状”铁素体及珠光体，组织转变受动态再结晶和相变共同作用，热影响区组织为等轴状铁素体和片层状珠光体．搅拌摩擦加工对各区域中珠光体及析出渗碳体的分布形态影响显著．搅拌摩擦加工后试样显微硬度明显增加，抗拉强度相比母材提高8.2%，断裂位置位于母材处，加工前后试样断裂形式均为微孔聚合韧性断裂．固溶强化与相变强化对硬度和抗拉强度的提高起主要作用．
    Abstract: 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.
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    • 参考文献(13)
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  • 收稿日期:  2017-04-05

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