304奥氏体不锈钢亚快速凝固组织演化和形成机理

特殊钢 ›› 2012, Vol. 33 ›› Issue (4): 53-56.

304奥氏体不锈钢亚快速凝固组织演化和形成机理

申丽娟^1,2, 邢淑清¹, 麻永林¹, 白亮¹, 李德发¹, 李建飞¹

1内蒙古科技大学材料与冶金学院，包头014010；
2济源钢铁集团公司，济源459000

收稿日期:2012-01-19 出版日期:2012-08-01 发布日期:2022-10-25
通讯作者: 通讯作者：邢淑清，教授，内蒙古科技大学材料和冶金学院，包头014010
作者简介:申丽娟(1986-) ，女，硕士研究生，凝固组织的分析和研究。
基金资助:
国家自然科学基金项目资助(51044002)、国际科技合作项目(Z010DFB70630)

Formation Mechanism and Structure Evolution of Austenitic Stainless Steel 304 during Solidification with Near-Rapid Rates

Shen Lijuan^1,2, Xing Shuqing¹, Ma Yonglin¹, Bai Liang¹, Li Defa1 and Li Jianfei1

1 Materials and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010;
2 Jiyuan Iron and Steel Group Co, Jiyuan 459000)

Received:2012-01-19 Published:2012-08-01 Online:2022-10-25

摘要/Abstract

摘要： 通过感应炉熔化的304钢(/%:0.053C、0.55Si、1.50Mn、0.030P、0.002S、17.02Cr、8.01 Ni、0.50Cu、0.08Mo)直接浇铸在水冷铜模上得到厚7 mm直径25 mm的圆形试样,研究了Cr、当量/Ni当量和1.5～1 000℃/s的冷却速率对奥氏体不锈钢铸态凝固组织形态和分布的影响。结果表明,随冷却速率增加至75～90℃/s,该钢的凝固模式由FA(铁素体-奥氏体)模式向AF(奥氏体-铁素体)模式转变,初生相由枝晶铁素体转变成枝晶奥氏体,但冷却为～1 000℃/s时,观察到块状铁素体组织,并且枝晶状奥氏体转变成胞状奥氏体。

Abstract: The effect of Creq/Nieq and cooling rate (1.5 ~ 1 000 Y/s) on structure morphology and distribution of as- cast solidification structure of austenite stainless steel 304 (/% : 0. 053C, 0. 55Si, 1. 50Mn, 0. 030P, 0. 002S, 17. 02Cr, 8. 01 Ni, 0. 50Cu, 0. 08Mo) is studied by induction furnace melting the steel and direct-casting on a water-cooling copper mold to get a sample with 7 mm thickness and 25 mm diameter. Results show that with increasing cooling rate to 75 ~ 90 ℃/s, the primary solidification mode of steel transferred from FA (ferrite-austenite) mode to AF (austenite-ferrite) mode, the primary phase is modified from dendritic ferrite to dendritic austenite, as the cooling rate is - 1 000℃/s, the blocky ferrite structure is observed, and the dendritic austenite is replaced by cellular austenite.

Key words: , Austenite Stainless Steel 304, Near-Rapid Solidification, Cr_eq/Ni_eq, Cooling Rate, Structure Morphology

申丽娟, 邢淑清, 麻永林, 白亮, 李德发, 李建飞. 304奥氏体不锈钢亚快速凝固组织演化和形成机理[J]. 特殊钢, 2012, 33(4): 53-56.

Shen Lijuan , Xing Shuqing , Ma Yonglin , Bai Liang, Li Defa, Li Jianfei. Formation Mechanism and Structure Evolution of Austenitic Stainless Steel 304 during Solidification with Near-Rapid Rates[J]. Special Steel, 2012, 33(4): 53-56.

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