论文部分内容阅读
在实际生产中大锻件不同部位因变形不均匀而导致晶粒尺寸不一。为了探究这一现象,利用Gleeble-1500D热模拟试验机在1000℃、应变速率0.1 s~(-1)、变形量5%~55%时模拟了大型低压转子用30Cr2Ni4MV钢的变形过程,研究了其在随后正火过程中晶粒大小随保温时间的变化规律。结果表明,与未变形试样相比,经过相同正火的变形试样的晶粒得到明显细化。在900℃正火的初期,变形量小于35%时,晶粒尺寸随变形量的增加而减小;当变形超过35%后,变形量对晶粒尺寸影响不大,且随保温时间的延长,不同变形量变形后试样的晶粒均会持续长大,正火5 h可以消除变形量对试样晶粒度的影响。
In the actual production of large parts forging deformation due to uneven deformation caused by different grain size. In order to explore this phenomenon, the deformation process of 30Cr2Ni4MV steel for large-scale low-pressure rotors was simulated with Gleeble-1500D thermal simulator at 1000 ℃, strain rate of 0.1 s ~ (-1) and deformation rate of 5% ~ 55% In the subsequent normalizing process, the grain size changes with the holding time. The results show that compared with the undeformed specimens, the grains of the deformed specimens after the same normalizing are obviously refined. In the initial stage of normalizing at 900 ℃, the grain size decreases with the increase of deformation when the deformation is less than 35%. When the deformation is over 35%, the deformation has little effect on the grain size. With the increase of holding time , The deformation of the sample deformation of the grain will continue to grow, normalizing 5 h can eliminate the deformation of the sample grain size.