摘要
采用热模拟试验机研究了含Cr高碳钢82B的连续冷却组织转变过程,然后采用ANSYS有限元软件模拟分析了不同规格盘条的控制冷却过程及规格效应。结果表明:当冷速小于5℃/s时,索氏体含量随冷却速率的增加而增加较快,而在5~10℃/s的冷速范围内变化较为平缓,在10℃/s时达到最大值94.3%,之后呈现线性下降趋势;索氏体片层间距S_(P)与过冷度ΔT之间满足关系:S_(P)^(-1)=2.6459+0.0726×ΔT;小规格盘条采用水冷加Stelmor风冷的方式可以获得较高的索氏体化率和较小的片层间距,且组织均匀性也较好;而随着盘条规格增大,吐丝前轧件内外的温差变大,相变前的冷速降低,相变开始温度升高,相变持续时间增加且温升变大,造成索氏体化率降低,片层间距增加,组织均匀性降低。
The continuous cooling microstructure transformation process of high carbon steel 82B containing Cr was studied using a thermal simulation testing machine,and then the controlled cooling process and specification effect of different specifications of wire rods were simulated and analyzed using ANSYS finite element software.The results show that when the cooling rate is less than 5℃/s,the content of sorbite increases rapidly with the increase of cooling rate,the change becomes relatively gentle within the cooling rate range of 5-10℃/s,and it reaches the maximum value of 94.3%at 10℃/s and then shows a linear downward trend.There is a relationship between the interlamellar spacing of sorbite(S_(P))and the undercooling(ΔT):SS_(P)^(-1)=2.6459+0.0726×ΔT.The use of water cooling combined with Stelmor air cooling for small-sized wire rods can achieve higher sorbite transformation rate and smaller interlamellar spacing,and the uniformity of the microstructure is also good.As the size of the wire rod increases,the temperature difference between the inside and outside of the rolled piece before spinning increases,the cooling rate before phase transformation decreases,the starting temperature of phase transformation increases,the duration of phase transformation increases,and the temperature rise increases,resulting in a decrease in the sorbite transformation rate,an increase in interlamellar spacing,and a decrease in microstructure uniformity.
作者
余世超
曹杰
梁磊
沈晓辉
王会廷
潘红波
YU Shi-chao;CAO Jie;LIANG Lei;SHEN Xiao-hui;WANG Hui-ting;PAN Hong-bo(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,China;Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology),Ministry of Education,Ma’anshan 243002,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2024年第12期191-200,共10页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1860105)。
关键词
高碳钢
控制冷却
组织转变
规格效应
有限元模拟
high carbon steel
controlled cooling
microstructure transformation
specification effect
finite element simulation
