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重点研究钒微合金化高锰(20%~30%)TWIP钢的静态软化和应变诱导析出行为,考察了不同钒含量(0.1%、0.2%)和碳含量(0.2%、0.6%、1%)的影响,目标是确定钒在热轧后还能有进一步析出强化作用的条件(如:成分、热加工参数)。在700~1100℃温度范围内进行了双道次扭转试验,还对卷取进行了模拟(从700℃到550℃)。采用先进的分析方法,如通过EBSD来确定晶粒尺寸和再结晶分数,采用TEM来分析析出物。结果表明,在热加工温度范围内,钒的析出相对迟缓,而且只在20%Mn-0.6%C-0.2%V或30%Mn-1%C-0.1%V的成分条件下发生。将碳含量降低到0.2%时,只在650℃和700℃模拟卷取后才能观察到析出物。另外,在有应变诱导析出发生的情况下,回复、再结晶和应变诱导析出之间有着复杂的相互影响。静态再结晶被明显推迟,导致回复对软化动力学具有重要影响。
The static softening and strain-induced precipitation behaviors of vanadium microalloyed high-manganese (20% -30%) TWIP steels were studied. The effects of different vanadium content (0.1%, 0.2%) and carbon content (0.2%, 0.6%, 1% ), The goal is to determine the conditions under which vanadium can further precipitate strengthening after hot rolling (eg, composition, thermal processing parameters). A two-pass torsion test was carried out at a temperature in the range of 700 to 1100 ° C. The coiling was also simulated (from 700 ° C to 550 ° C). Advanced analytical methods, such as determining the grain size and recrystallization fraction by EBSD, were used to analyze the precipitates. The results show that precipitation of vanadium is relatively slow in the hot working temperature range and occurs only under the compositional conditions of 20% Mn-0.6% C-0.2% V or 30% Mn-1% C-0.1% V. When the carbon content was reduced to 0.2%, precipitates were observed only after simulated coiling at 650 ° C and 700 ° C. In addition, there is a complex interaction between recovery, recrystallization and strain induced precipitation in the presence of strain induced precipitation. Static recrystallization was significantly delayed, resulting in the recovery of softening kinetics has an important impact.