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Structure-properties relationship of ultra-fine grained V-microalloyed dual phase steels

机译：超细晶粒V微合金化双相钢的结构性能关系

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摘要

The effect of vanadium microalloying on ultra-high strength dual phase (DP) ferrite-martensite steel micro-structure and properties was studied. It was found that the addition of 0.14 wt% V to a Fe-0.18C-l.5Mn-0.3Si-0.008N reference alloy introduced very significant ferrite grain size refinement in the cold rolled and annealed state. During continuous annealing the initial ferrite to austenite transformation kinetics were strongly retarded, however under slow cooling both pearlite and bainite transformations were suppressed indicating increased hardenability. After cold rolling and intercritical annealing at 750 ℃ intense V(C,N) precipitates (mean radius 3.7 nm) were observed in the ferrite phase whereas precipitates were scarce in martensite (austenite) and much larger (mean radius 6.7 nm). Significant gains in YS, UTS and work hardening rate were observed at low martensite fractions due to a combination of selective precipitation strengthening and grain refinement of ferrite. However, at higher martensite fractions (> 45%) the YS, UTS and work hardening rate became lower than the reference, primarily due to softening of the martensite. The latter was attributed to the fixing of solute carbon by V(C,N). The net increase in tensile strength with martensite content of the vanadium alloy was - 4 MPa/%cc' compared to ~ 16 MPa/%a' for the reference alloy. A recently developed size-sensitive mean field structure-properties model was extended to capture these microalloying effects. At iso-tensile strength both the fracture strain and hole expansion behaviour of the new microalloyed steel showed improved performance over the reference.
机译：研究了钒微合金化对超高强度双相铁氧体-马氏体钢组织和性能的影响。已经发现，在Fe-0.18C-1.5％Mn-0.3Si-0.008N参比合金中添加0.14wt％的V在冷轧和退火状态下引入了非常显着的铁素体晶粒尺寸细化。在连续退火过程中，最初的铁素体到奥氏体的转变动力学受到强烈阻碍，但是在缓慢冷却下，珠光体和贝氏体的转变均被抑制，表明淬透性增加。经过冷轧和在750℃进行临界退火后，在铁素体相中观察到了强烈的V（C，N）析出物（平均半径3.7 nm），而马氏体（奥氏体）中的析出物稀少且更大（平均半径6.7 nm）。由于选择性的析出强化和铁素体晶粒细化的结合，在低马氏体含量下观察到了YS，UTS和加工硬化率的显着提高。但是，在较高的马氏体含量（> 45％）下，YS，UTS和加工硬化率低于参考值，这主要是由于马氏体的软化。后者归因于通过V（C，N）固溶碳。钒合金的拉伸强度随马氏体含量的净增加为-4 MPa /％cc'，而参考合金为〜16 MPa /％a'。扩展了最近开发的尺寸敏感平均场结构-属性模型，以捕获这些微合金作用。在等拉伸强度下，新型微合金钢的断裂应变和扩孔行为均显示出优于参考文献的性能。

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