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通过设定合理的送进角和辗轧角,并应用有限元方法成功地模拟了空心双金属管坯的斜轧扩径过程,研究了双金属复合管坯变形各阶段的轧制力、等效塑性应变、温度场分布。结果表明,在稳定扩径阶段的扩径区出现轧制力最大值,是空心双金属复合管坯内外层材料最易发生缺陷的区域,工件内部的高温有利于内外层材料在界面处的协调变形。同时进行了空心双金属管坯斜轧扩径试验,金相、扫描电镜照片显示双金属复合无缝钢管界面冶金结合良好,充分证明了双金属管坯斜轧扩径工艺的可行性。
By setting a reasonable feed angle and rolling angle, and using finite element method to successfully simulate the expansion process of the hollow bimetallic tube slant rolling, the bimetallic composite tube blank deformation of the various stages of the rolling force, etc. Effective plastic strain, temperature field distribution. The results show that the maximum rolling force appears in the enlarged area during the steady expansion phase, which is the most prone to defects in the inner and outer layers of the hollow bimetal composite tube. The high temperature inside the workpiece is conducive to the coordination of the inner and outer layers at the interface Deformation. At the same time, the diameter-expanding experiment of hollow bimetallic tube was carried out. The metallographic and scanning electron micrographs showed the metallurgical bond between bimetallic composite and seamless steel tube well, which fully proved the feasibility of the biaxial expanding method of bimetallic tube.