累积叠轧技术的研究现状与展望

对采用累积叠轧工艺制备超细晶组织的技术进行详细的综述,介绍了累积叠轧技术的原理、ARB材料的组织与力学性能特征,并对ARB变形过程中的剪切变形、晶粒细化机制和强化机制进行分析。采用ARB技术可以制备大尺寸的超细晶组织材料,其室温抗拉强度通常比粗晶材料的高2～4倍。ARB材料的强化源于晶粒细化、位错强化、在大变形轧制时形成的稳定基面织构、表面的氧化膜以及内生原有夹杂物在强烈塑性变形情况下的破碎与弥散分布。分析了ARB技术的优越性,对其在制备超细晶材料领域的应用进行了展望。

Status and expectation of research on accumulative roll-bonding

The process of accumulative roll-bonding was reviewed. The principle of ARB, the ARB processed microstructure and mechanical properties were described in detail. The shear strain, mechanism of grain refining and strengthening were analyzed. Large size materials with ultrafine grains can be achieved easily by ARB process, whose tensile strength is usually 2-4 times compared with those of coarse grain materials. The strengthening can be attributed to the ultrafine grains, dislocation and texture developed during ARB process, as well as the dispersed oxide films and inclusions on the surfaces by repetition. According to its advantages on the manufacture of high-strength bulk materials at a high level of productivity, ARB is a promising process in preparing materials with UFG microstructure.