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钢凝固两相区溶质元素的微观偏析及其对连铸坯表面纵裂纹的影响

蔡兆镇朱苗勇

金属学报

以Ueshima的正六边形横断面枝晶模型为原型, 采用有限差分方法建立了钢凝固过程伴随δ/γ相变的两相区溶质微观偏析模型, 确立了在冷却速率为10 ℃/s非平衡凝固条件下钢的脆性温度区间, 研究分析了各溶质元素在该温度区内的偏析特点及对脆性温度区间Δθ_B与热应变的影响规律, 定量计算了不同P, S含量下脆性温度区热应变随C含量的变化规律, 揭示了P, S含量的增加使连铸坯出现表面纵裂纹几率提高的机理.

关键词: 连铸 , microsegregation , longitudinal surface cracks , brittle temperature range , thermal strain

FRACTURE MECHANICS ANALYSIS OF THERMAL STRAIN FATIGUE LIFE FOR THE SINTERING MACHINE PALLET

LI Zhenzi and LI Ming (Department of Architectnre Engineering , Central South University of Technology , Changsha 410083 , China)LIAO Fuchang (Shenzhen School of Technology , Shenzhen 518029 , China)Manuscript received 10 August 1995 , in revised form 12 April 1996

金属学报(英文版)

In recent years elastic-plastic fracture mechanics has developed rapidly and is widely used to solve various engineering problems. The application of elastic-plastic fracture mechanics on the pallet of sintering machine is approached in detail for the first time in the present study. The theoretical results were compared with the actual data determined from sintering machine pallet. Results show that good agreement was achieved between the method suggested by the author and the actual data. The basis of determining design of the sintering machine pallet in iron and steel engineering has been provided and it will result in great economic benefits.

关键词: : pallet , null , null , null

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