1.2%Si冷轧无取向电工钢铸坯高温延塑性研究  

Research on High Temperature Ductility of 1.2%Si Cold Rolled Non-oriented Electrical Steel Slab

作　　者：胡少东[1,2] 项利[2] 赖朝彬[1] 仇圣桃[2] 贾彩霞[3] 谢森林[1] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]钢铁研究总院国家连铸中心,北京100081 [3]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《钢铁钒钛》2012年第3期77-81,共5页Iron Steel Vanadium Titanium

摘　　要：采用Gleeble1500应力/应变热模拟试验机对1.2%Si冷轧无取向电工钢铸坯进行了高温延塑性测试;在1 300～600℃的试验温度下,得到了试样的热塑性和强度曲线,并通过对不同温度下试样的断口形貌及脆性区夹杂物的观察,分析其在脆性温度区域的脆性断裂的机理。研究结果表明:1.2%Si冷轧无取向电工钢铸坯在1.0×10-3/s应变速率下,测试温度在1 300～600℃范围内,存在1 220℃以上的第Ⅰ脆性温度区域和780～600℃的低塑性温度区域。1.2%Si冷轧无取向电工钢780～600℃时塑性降低的原因:一方面是动态再结晶困难;另一方面是铁素体低温区域发生的氮化物(AlN)及硅铝酸盐的析出产生的晶界脆化。High temperature ductility test for 1.2% Si cold-rolled non-oriented electrical steel slab at 600~1 300 ℃ has been carried out by Gleeble1500 stress/strain thermomechanical simulator.Thermoplasticity and intensity curve of samples under testing temperatures was obtained,then through the observation of inclusions in the brittleness area and the fracture surface of samples at different temperatures,the mechanism of the brittle fracture in its brittleness temperature zone was analyzed.The results show that there exist a brittleness temperature zone Ⅰat above 1 220 ℃ and a low-plasticity temperature zone between 600 ℃ and 780 ℃ in 1.2% Si cold-rolled non-oriented electrical steel slab at strain rate of 1.0×10-3s-1 and test temperature of 600~1 300 ℃.One reason for the decrease of plasticity of 1.2% Si cold-rolled non-oriented electrical steel at the temperature between 600 ℃ and 780 ℃ is that it is very difficult to recrystallize,and another is the existence of AlN from ferrite in low temperature zone and crystal embitterment due to the precipitation of aluminosilicate.

关 键 词：无取向电工钢 1.2%Si 铸坯 高温延塑性 

分 类 号：TG335.12[金属学及工艺—金属压力加工]