Study on aging strengthening of Fe-22Mn-0.6C-3.5Cu-0.3V high-manganese TWIP steel
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摘要: 对熔炼制备的Fe-22Mn-0.6C-3.5Cu-0.3V高锰TWIP钢进行固溶和时效处理，研究该钢的时效析出行为和强化机理。结果表明：固溶态和时效态高锰TWIP钢的基体均为奥氏体组织，经时效处理后在奥氏体基体中析出纳米级的富Cu相和VC碳化物，它们均与基体存在立方取向关系，其中富Cu相与基体之间的界面是共格的，而VC碳化物是非共格的；室温拉伸力学性能显示富Cu相和VC碳化物的析出显著提高了高锰TWIP钢的屈服强度，与固溶态钢相比，时效态钢的屈服强度提高了60.6%；根据析出强化理论计算得到的屈服剪切应力增量与试验的结果相符合，其中来源于富Cu相位错切过强化机制的强度贡献占增量的60.8%，而来源于VC碳化物位错绕过强化机制的强度贡献占增量的39.2%。Abstract: Solid solution and aging treatment had been conducted on Fe-22Mn-0.6C-3.5Cu-0.3V high-manganese TWIP steel prepared by melting, and the precipitation behavior during aging as well as the associated strengthening mechanisms had been investigated. The results show that the matrix in both solid solution and aging-treated high-manganese TWIP steels is austenitic structure. After aging treatment, nano-sized Cu-rich phases and VC carbides precipitate in the austenitic matrix, both of them show a cube-on-cube orientation relationship with the matrix. The interface between Cu-rich phase and austenitic matrix is coherent, while the VC carbide is non-coherent. The tensile properties at room temperature indicates the precipitation of Cu-rich phase and VC carbide can significantly increase the yield strength of high-manganese TWIP steel. The yield strength of aging-treated steel is increased by 60.6% higher than that of solid solution-treated steel. The yield shear stress increment calculated based on the precipitation strengthening theory is good agreement with the experimental results. The strength contribution from dislocation shear strengthening mechanism of Cu-rich phase accounts for 60.8% of the increment, while that from dislocation bypass strengthening mechanism of VC carbide accounts for 39.2% of the increment.
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图 2 高锰TWIP钢的XRD与OM结果
(a) XRD图谱; (b) 固溶态样品的OM照片; (c) 时效态样品的OM照片
Figure 2. XRD and OM results of high-manganese TWIP steel after heat treated under different conditions
图 3 高锰TWIP钢的TEM结果
(a) 固溶态样品的TEM照片; (b) 时效态样品晶粒内部球形析出相的TEM照片; (c) 富Cu相的高分辨TEM照片; (d) 富Cu相高分辨TEM照片的FFT图; (e) 时效态样品晶粒内部多边形析出相的TEM照片; (f) VC碳化物的高分辨TEM照片; (g) VC碳化物高分辨TEM照片的FFT图
Figure 3. TEM results of high-manganese TWIP steel after heat treated under different conditions
图 4 Fe-22Mn-0.6C-3.5Cu-0.3V高锰TWIP钢的室温拉伸工程应力-应变曲线
Figure 4. Room-temperature tensile engineering stress-strain curves of high-manganese TWIP steel
表 1 高锰TWIP钢的化学成分
Table 1. Chemical compositions of high-manganese TWIP steel
% Element Mn C Cu V Fe Nominal composition 22 0.6 3.5 0.3 Bal. Measured composition 23.69 0.59 3.60 0.31 Bal. 
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表 2 高锰TWIP钢的室温拉伸力学性能
Table 2. Room-temperature tensile properties of high-manganese TWIP steel
Sample Rp0.2 Rm A/% Solution treatment 303.5 740.1 77.2 Aging treatment 487.4 833.1 36.3
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