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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Study on Ferrite Intragranular Nucleation in a V-Microalloyed Steel
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Study on Ferrite Intragranular Nucleation in a V-Microalloyed Steel

机译：V微合金钢中铁素体晶内形核的研究

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摘要

The intragranular nucleation of ferrite has been studied in a V-microalloyed steel (C=0.102; Mn=1.479; V=0.140; N=0.016, %wt). By means of hot torsion tests, recrystallization-precipitation-time-temperature (RPTT) diagrams have been drawn which show the precipitation kinetics and the recrystallization-precipitation interaction at any temperature. RPTT diagrams were determined at two strains, 0.20 and 0.35 respectively. Deformation tests were carried out at 890℃ and different holding times, corresponding to moments before the start of precipitation, during precipitation and after precipitation had ended, respectively. In order to relate the precipitation state with the intragranular nucleation, the strengthening of austenite was measured taking into account the non-recrystallized austenite fraction prior to the phase transformation. In this way, the possibility of V-nitrides acting as nucleation sites was evaluated by comparison of ferrite grain size versus holding time. Thus it was found that the precipitate size and precipitated volume are influencing the intragranular nucleation, although this is not a strong influence.
机译：在V型微合金钢中已研究了铁素体的晶内形核（C = 0.102; Mn = 1.479; V = 0.140; N = 0.016，％wt）。通过热扭转试验，绘制了重结晶-沉淀-时间-温度（RPTT）图，该图显示了在任何温度下的沉淀动力学和重结晶-沉淀的相互作用。 RPTT图是在两个应变（分别为0.20和0.35）下确定的。分别在890℃和不同的保温时间下进行了变形试验，分别对应于开始沉淀之前，沉淀期间和沉淀结束之后的时刻。为了使析出状态与晶内形核相关，在相变之前考虑了未再结晶的奥氏体成分，对奥氏体的强化进行了测量。这样，通过比较铁素体晶粒尺寸与保持时间，评估了V型氮化物作为成核位点的可能性。因此发现，虽然这不是很强的影响，但沉淀物的大小和沉淀的体积正在影响颗粒内的形核。

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