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针对大型锻造支承辊轴颈密集夹杂性缺陷产生原因开展理化检验和数值模拟分析,采用锻造过程有限元数值模拟中的节点反向跟踪技术,确定支承辊夹杂物缺陷在钢锭中的初始位置。研究结果表明,大型支承辊轴颈密集夹杂性缺陷为硅酸盐和氧化铝的复合型夹渣,来源为距钢锭底面450 mm、距钢锭外表面70 mm的196 mm×150 mm矩形区域内。
Physical and chemical tests and numerical simulation were carried out in view of the causes of the dense inclusion defects in the forging journal of large forged backup rollers. The back tracking technique was used in the numerical simulation of forging process to determine the initial position of the support roller inclusion defect in the ingot. The results show that the dense inclusion defects of the large support roller journal are complex inclusions of silicate and alumina originating from a rectangular area of 196 mm × 150 mm, 450 mm away from the ingot bottom surface and 70 mm from the ingot outer surface.