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使用不同的热处理工艺参数研究了11Cr3W3Co铁素体/奥氏体钢组织和力学性能的变化规律。结果表明,钢的强度随回火温度的升高而降低,并在550℃回火后的钢出现了明显的二次硬化。回火温度超过550℃后,强度快速下降。11Cr3W3Co钢经过不同热处理后均发现有大量的δ铁素体。高温回火后,δ铁素体的边界形成80~100 nm宽的M_(23)C_6碳化物析出带。同时,二次硬化是由于大量细小W_2C碳化物的析出造成的。随回火温度升高,晶粒内部出现位错胞,位错密度下降,从而使钢的强度降低。
The microstructure and mechanical properties of 11Cr3W3Co ferrite / austenitic steel were studied by using different heat treatment process parameters. The results show that the strength of the steel decreases with the increase of tempering temperature, and the steel after tempering at 550 ℃ has obvious secondary hardening. Tempering temperature exceeds 550 ℃, the rapid decline in strength. 11Cr3W3Co steel after different heat treatment are found in a large number of δ ferrite. After tempering at high temperature, the boundary of δ-ferrite forms a M_ (23) C_6 carbide precipitation zone with a width of 80-100 nm. At the same time, the secondary hardening is due to the precipitation of a large number of small W_2C carbides. With the tempering temperature increases, dislocation cells appear within the grains, dislocation density decreases, so that the strength of the steel decreases.