论文部分内容阅读
研究了304不锈钢双辊薄带连铸中控制凝固组织的因素,观察到了从铁素体到亚稳态奥氏体最初凝固状态的转变,此转变是由于溶体在冷铸辊附近达到10~3KS~(-1)级相对高的冷速而过冷造成的。原始奥氏体凝固程度取决于不同的熔体装入置之间可能的合金成分的波动,且从临近带钢表面的一些局部奥氏体区到凝固带的完全奥氏体间会产生变化。作为原始铁素体的凝固区,发现了不均匀的Ni,Cr定向偏析,而作为原始奥氏体的凝固区发现了此两元素均匀的定向偏析。磁测量表明:铁素体体积百分数在原始铁素体凝固薄带中变化约为1.3到1.9体积百分数,而凝固为原始奥氏体的试样中,变化量约在0.1到0.2的体积百分数。
The factors that control the solidification structure in 304 stainless steel twin-roll strip casting were studied. The initial solidification state from ferrite to metastable austenite was observed. The change was due to the melt reaching 10-3KS near the chilled roll ~ (-1) level of relatively high cooling rate caused by the cold. The degree of austenite solidification depends on possible fluctuations in the composition of the alloy between the different melt deposits and changes from some localized austenite areas near the strip surface to complete austenite in the solidification zone. As the solidification zone of the original ferrite, uneven Ni and Cr orientation segregation was found, and as the solidification zone of the original austenite, uniform orientation segregation of these two elements was found. Magnetic measurements show that the volume fraction of ferrite varied from about 1.3 to about 1.9 volume percent in the original ferrite solidified strip and about 0.1 to 0.2 volume percent change in the sample solidified to the original austenite.