ECAP变形2J4合金的显微组织演变

Microstructure Evolution of 2J4 Alloy Deformed by ECAP

借助光学显微镜和透射电镜对2 J4合金等径弯曲通道变形(ECAP)组织进行了研究。结果表明,常温下2 J4合金ECAP变形的最大累积真应变达到3.0,相当于压下量达到90%。ECAP变形1道次后,晶粒由30μm转变为具有一定方向性、相互平行的宽约0.35μm、长约为2.5μm的马氏体板条组织。随着变形道次增加,马氏体进一步细化,且出现晶粒从大板条向小的板条及等轴晶转化的趋势。另外,α相转变量随着变形量的增大而增加。

The equal channel angular pressing （ECAP） of 2J4 alloy was studied at room temperature with route A in which the sample was not rotated after pressing one pass and entered directly the next pass. The evolution of microstructure of 2J4 alloy after ECAP was investigated by means of optical microscopy （ OM ） and transmission electron Microscopy （ TEM）. The results show that the total equivalent true strain of 2J4 alloy is about 3.0 after ECAP, which is corresponding to the depressing amount of 90%. After one pass ECAP, the grain of the alloy changed into the lath martensite of 0.35μm in width and 2. 5μm in length from 30μm in diameter. When the deformation pass increased, the martensite refined farther and the lath martensite transformed into the equiaxed grains. Moreover, the amount of α phase increased along with the increase of deformation amount.