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进行了有关强化控制轧制与加速冷却钢的冶金分析。与普通轧制相比较,采用加速冷却可强化具有铁素体-珠光体组织结构的低碳当量钢。这种强化来源于:①细微的铁素体晶粒;②铁素体自身强化;⑧珠光体体积百分率提高。而铁素体强化起因于铁素体的过饱和、细微弥散的碳化物以及铁素体晶粒位错诱导相变。此外,还对具有马氏体组织结构合金钢直接淬火后的强度进行了研究。在淬火工艺条件方面,将钢从非奥氏体再结晶区进行直接淬火与相同成分的加热-淬火钢相比,具有更高的强度。显然,这并非取决于钢材中的合金元素,而是由所保留的热轧马氏体引起晶格缺陷所决定。然而,与普通淬火钢水平相比较,回火后直接淬火钢的强化则受合金元素的影响。在直接淬火钢回火以及奥氏体区加工时,钼是最有效的合金元素,因其与抑制回火时位错消失密切相关。
Metallurgical analysis was conducted on intensive controlled rolling and accelerated cooling of steel. Compared with ordinary rolling, the use of accelerated cooling can be strengthened with ferrite - pearlite structure of low carbon equivalent steel. This strengthening comes from: ① fine ferrite grains; ② ferrite itself strengthened; ⑧ pearlite volume percentage increase. Ferrite strengthening results from ferrite supersaturation, finely dispersed carbides, and dislocation induced transformation of ferrite grains. In addition, the strength of the martensitic alloy steel after direct quenching was also studied. In quenching process conditions, direct quenching of the steel from the non-austenite recrystallization zone has higher strength than quenched steel of the same composition. Obviously, this does not depend on the alloying elements in the steel but rather on the lattice defects caused by the retained hot-rolled martensite. However, compared with ordinary hardened steel, the strengthening of direct hardened steel after tempering is affected by alloying elements. In the direct quenching of steel tempering and austenitic processing, molybdenum is the most effective alloying elements because it is closely related to the suppression of dislocation disappearance of tempering.