薄带连铸304不锈钢碳化物析出及溶解过程的原位观察

王成全;于艳;方园;李廷举

钢铁研究学报 ›› 2007, Vol. 19 ›› Issue (9) : 42-0.

钢铁研究学报 ›› 2007, Vol. 19 ›› Issue (9) : 42-0.
材料研究

薄带连铸304不锈钢碳化物析出及溶解过程的原位观察

  • 王成全1,于艳1,方园1,李廷举2
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InSitu Observation of Carbide Precipitation and Dissolution in Strip Cast 304 Stainless Steel

  • WANG Chengquan1,YU Yan1,FANG Yuan1,LI Tingju2
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摘要

采用激光共焦扫描显微镜原位观察薄带连铸304不锈钢高温下碳化物的析出及溶解过程。结果表明,薄带连铸304不锈钢在600 ℃开始析出碳化物,首先从晶内析出,而后从晶界析出,碳化物析出量随温度升高逐渐增加,到900 ℃时,析出量最大;1 006 ℃时,碳化物开始溶解,1 049 ℃时,大部分碳化物迅速溶解,1 155 ℃时,碳化物完全分解溶入基体,其溶解过程为δ→M23C6+δ′→γ。碳化物析出与薄带连铸铸带凝固组织及后续冷却过程有关。

Abstract

The carbide in 304 stainless steel has great effect on the strip performance in strip casting process. The carbide precipitation and dissolution were insitu observed using a confocal scanning laser microscope in strip cast 304 stainless steel. It was found that carbide precipitating started at 600 ℃, first in grain interior, then in grain boundary, and carbide quantity increased with increasing the temperature, at 900 ℃reached its maximum quantities. The carbide was dissolved at 1 006 ℃; at 1 049 ℃ most carbide dissolved rapidly and at 1 155 ℃ dissolved completely. The principle of carbide precipitation and resolution is δ→M23C6+δ′→γ, which is related with the solidification microstructure and cooling process of strip casting.

关键词

304不锈钢 / 薄带连铸 / 碳化物 / 析出 / 溶解

Key words

304 stainless / strip casting / carbide / precipitation / dissolution

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导出引用
王成全;于艳;方园;李廷举. 薄带连铸304不锈钢碳化物析出及溶解过程的原位观察[J]. 钢铁研究学报, 2007, 19(9): 42-0
WANG Chengquan;YU Yan;FANG Yuan;LI Tingju. InSitu Observation of Carbide Precipitation and Dissolution in Strip Cast 304 Stainless Steel[J]. Journal of Iron and Steel Research, 2007, 19(9): 42-0

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