高牌号无取向硅钢常化板不同温度下的力学性能研究
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摘要
检测了三种不同合金量高牌号无取向硅钢常化板在-20～300℃的拉伸性能并观察了断口形貌。合金量较低的材料在整个温度区间内断口均显现出较强的韧窝特征。3.2%含硅量材料在20℃以下表现出较强脆性,断口解理特征较明显,40℃至内耗温度范围内,断口韧窝特性增加,解理特性减少,随着温度继续升高,断口再次出现较强解理特征。随着温度升高,三种材料的抗拉强度与屈服强度逐渐降低,在内耗温度范围内拉伸变形时位错滑移会拖拽柯垂尔气团随之迁移,造成了随温度升高强度上升、延伸率下降的现象,在内耗温度以上,强度再次随温度上升而降低,延伸率也逐渐提高。
The tensile properties of three different high grade non-oriented silicon steel normalizing plate with different alloy contents at-20℃ ～300℃ were investigated and the corresponding fractography characteristics were observed.The materials with 3.2% alloy content exhibited more brittleness and enhancing cleavage fractography below 20℃.The inter-granular fracture reduced and dimples fracture became obvious at the temperature over 30℃,almost all the fractures were dimples at 40°C.The materials with lower alloy content show strong dimple characteristics in the fractures in the entire temperature range.As temperature rises,the tensile strength and yield strength of the material gradually decrease.The Cottrell atmosphere would be trailed by the moving dislocations during the tensile deformation at the internal friction temperature,which induced decreasing elongation and the strength increase.Above the internal friction temperature,the strength decreases again with rising temperature,and the elongation also gradually increases.
The tensile properties of three different high grade non-oriented silicon steel normalizing plate with different alloy contents at-20℃ ～300℃ were investigated and the corresponding fractography characteristics were observed.The materials with 3.2% alloy content exhibited more brittleness and enhancing cleavage fractography below 20℃.The inter-granular fracture reduced and dimples fracture became obvious at the temperature over 30℃,almost all the fractures were dimples at 40°C.The materials with lower alloy content show strong dimple characteristics in the fractures in the entire temperature range.As temperature rises,the tensile strength and yield strength of the material gradually decrease.The Cottrell atmosphere would be trailed by the moving dislocations during the tensile deformation at the internal friction temperature,which induced decreasing elongation and the strength increase.Above the internal friction temperature,the strength decreases again with rising temperature,and the elongation also gradually increases.
引文
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[2]王国栋.近年我国轧制技术的发展、现状和前景[J].轧钢,2017,34(1):1-8.
[3]罗阳,吕其春.3%Si-Fe热轧板脆变温区及其断口考察[J].金属学报,1977,(9):194-199.
[4]安治国,毛卫民.取向电工钢的低温拉伸变形和断裂行为[J].材料研究学报,2009,25(5):487-482.
[5] D.F.Stein,J.P.Low,Mobility of edge dislocations insiliconcrystals[J],Journal of Applied Physics,1960,31(2):362.
[6] GB/T 228-2015[S].金属材料.拉伸试验.北京:中国标准出版社,2015.
[7]李海丰.拉伸试验速率对冷轧薄板力学性能的影响[J].工程技术,2010,(15):31.
[8]齐俊杰,黄运华,张跃.微合金化钢[M].北京:冶金工业出版社,2006.
[9]王锋,朱志勇,郭海荣.常化工艺对高牌号无取向硅钢组织和织构的影响[J].轧钢,2017,34(6):28-32.
[10]束德林.工程材料力学性能[M].北京:机械工业出版社,2003.
[11]毛卫民,杨平.电工钢的材料学原理[M].北京:高等教育出版社,2013.
[12]夏雪兰,王立涛,裴英豪.环境温度对高牌号无取向硅钢力学性能的影响[J].金属功能材料,2017,24(4):50-53.
[13]哈宽富.力学性质的微观理论[M].北京:科学出版社,1983:75-95.
[14]矫志杰,孙涛,李建平.难变形材料轧制实验机开发及实验研究[J].东北大学学报(自然科学版),2017,38(2):229-233.