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在备有拉伸装置的扫描电镜下,观察了层片型铁素体加马氏体双相组织的变形及断裂过程。结果表明,马氏体体积分量不同会引起层片型双相组织的早期变形和断裂行为发生某些变化。当马氏体体积分量较小时,层片型双相组织中存在有较多的块状铁素体,使早期变形以块状铁素体切变为主,裂纹易在变形棱带或夹杂物等处萌生。随着马氏体体积分量增大,铁素体多呈细片状分布在马氏体片层之间,形成各种片层取向不同的区域(类珠光体团)。这种层片型双相组织可通过类珠光体团切变协调变形,并使裂纹易在类珠光体团交界、夹杂物或类珠光体团断裂处萌生。
Under the scanning electron microscope with tension device, the deformation and fracture process of lamellar ferrite plus martensite dual phase structure were observed. The results show that the different volume fraction of martensite causes some changes in the early deformation and fracture behavior of the lamellar dual phase structure. When the volume fraction of martensite is small, there are more massive ferrite in the lamellar dual phase structure, so that the early deformation is dominated by massive ferrite shear. The cracks are easy to be deformed or deformed Other places such as initiation. With the increase of the volume fraction of martensite, ferrite is mostly distributed in the form of fine flakes between the martensite lamellae to form various zones with different lamellar orientations (pearlite-like clusters). The lamellar dual-phase structure can deform through the pearlite group shear deformation, and make the cracks easily pearlite group at the junction, inclusions or pearlite mass breakage initiation.