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在低碳钢和低碳加铌、钒、钛微合金钢中,通过马氏体冷轧-回火的方法获得了尺寸为数百纳米的超细晶粒铁素体组织,研究了超细晶粒组的形成机制和热稳定性.通过马氏体相变在这些钢中引入了大量高密度位错,马氏体冷轧后位错进一步增殖,形成大量位错胞状结构;在500-600℃进行的60 min回火将上述胞状结构转变成具有清晰大角晶界的超细晶粒.在回火过程中形成的微合金元素碳化物对位错运动和晶界移动具有有效的“钉扎”作用,有助于获得超细晶组织并明显提高其热稳定性.
In the low carbon steel and low carbon plus niobium, vanadium and titanium microalloyed steel, the superfine grain ferrite structure with the size of hundreds of nanometers was obtained by the martensitic cold rolling-tempering method. The formation mechanism and the thermal stability of the grain group.A large number of high-density dislocations were introduced into these steels through the martensitic transformation and the dislocations were further multiplied after the cold-rolling of the martensite to form a large number of dislocation cell structures. The tempering at 600 ℃ for 60 min transformed the above cellular structure into ultrafine grains with sharp large-angle grain boundaries.The microalloyed carbides formed during tempering had effective “ Pinning ”role, help to obtain ultra-fine grain organization and significantly improve its thermal stability.