高牌号无取向硅钢70mm连铸板坯-Φ13mm锻材的高温力学性能  

Elevated-Temperature Mechanical Properties of Φ13 mm Bar Forged from 70 mm Casting Slab of High Grade Non-Oriented Silicon Steel

作　　者：花艳侠 张晨[2] 马良[2] 荣哲[2] 项利[2] 仇圣桃[2] 

机构地区：[1]辽宁科技大学,鞍山114000 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《特殊钢》2015年第1期62-64,共3页Special Steel

摘　　要：通过Gleeble-1500应力-应变热模拟试验机测试了由70 mm连铸坯锻成的Φ13 mm棒材的高牌号无取向硅钢(/%:0.002 7C,3.06Si,0.32Mn,0.013P,0.004S,0.50Al,0.002 7Ti,0.004 2 N)的高温(600~1 250℃)力学性能。结果表明,在应变速率为1×10^(-3)s^(-1)时,高牌号无取向硅钢中仅存在第Ⅰ脆性温度区(1 250℃至熔点),第Ⅱ脆性温度区和第Ⅲ脆性温度区均未出现,主要原因是超低碳(≤50×10^(-6))、高硅(3%Si)致使硅钢凝固冷却过程中不经历α-γ-α相变,避免了固溶的硫、氧等元素以(Fe,Mn)O、(Fe,Mn)S、Al_2O_3等形式在奥氏体晶界沉淀和长大导致晶界强度降低,产生裂纹。The mechanical properties of Φ13 mm bar forged from 70 mm casting thin slab of high grade non-oriented silicon steel（/%：0.0027 C,3.06 Si,0.32 Mn,0.013 P,0.004 S,0.50A1,0.0027 Ti,0.0042N） at elevated temperature 600 ~1 250 ℃ are measured by Gleeble-1500 stress-strain thermal simulation machine.Results show that with strain rate 1 × 10^-3s^-1,only Ⅰ britde zone（1 250 ℃ to melting point） exists in the high grade non-oriented silicon steel,and the Ⅱ britde zone and Ⅲ britde zone are all of no-occurrence.The main cause is that the extra-low carbon content（≤50 × 10^-6） and high silicon content（3%Si） in steel lead to no-course of α-γ-α phase transformation during silicon steel solidifying and cooling process to avoid the sulfur,oxygen etc elements in solid solution status in forms of（Fe,Mn）O,（Fe,Mn） S and Al2O3 precipitated and grown at austenite grain boundary resulting in the strength of grain boundary decreasing and the cracks occurring.

关 键 词：高牌号无取向硅钢 70mm连铸板坯 高温力学性能 相变 

分 类 号：TG142.1[一般工业技术—材料科学与工程]