Abstract：The dendritic crystal morphology，element segregation and precipitation behaviors of super austenitic stainless steel 654SMO ingot were investigated by means of Thermo-Calc calculation，optical microscope （OM） and scanning electron microscope （SEM）. Based on the alloy phase diagram and kinetic homogenizing curves，the homogenization treatments of 654SMO were proposed. Through the analysis of dendritic crystal morphology，residual segregation index and precipitates after different homogenization treatments，combined with forging experiments，the reasonable homogenization treatment of 654SMO has been determined. The results show that the segregation of Mo was the most serious during the solidification of 654SMO，and the degree of segregation in the center of ingot was greater than that of the edge. Mo mainly segregated at the dendrite core and promoted the precipitation of σ phase. After homogenizing at 1 280 ℃ for 16 h，the segregation of elements was basically eliminated，the dendrite was fully melted，the precipitates were fully dissolved，and the hot ductility of the ingot has been greatly improved.
收稿日期: 2018-02-09
出版日期: 2018-08-24
引用本文:
高建兵，范思鹏，张树才，姜周华，李花兵. 新型超级奥氏体不锈钢654SMO偏析行为及均匀化工艺[J]. , 2018, 53(8): 83-89.
GAO Jian-bing，FAN Si-peng，ZHANG Shu-cai，JIANG Zhou-hua，LI Hua-bing. Segregation behavior and homogenizing treatment of a new type super austenitic stainless steel 654SMO. Iron and Steel, 2018, 53(8): 83-89.
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2018, Vol. 53 
