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材料研究学报  2009, Vol. 23 Issue (5): 478-482    
  研究论文 本期目录 | 过刊浏览 |
取向电工钢的低温拉伸变形和断裂行为
安治国; 毛卫民
北京科技大学新金属材料国家重点实验室 北京 100083
Analysis on tensile deformation and fracture behaviors of grain oriented electrical steels at low temperature
AN Zhiguo; MAO Weimin
引用本文:

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, 23(5): 478-482.
, . Analysis on tensile deformation and fracture behaviors of grain oriented electrical steels at low temperature[J]. Chin J Mater Res, 2009, 23(5): 478-482.

全文: PDF(1051 KB)  
摘要: 

测量了普通取向电工钢室温至300℃的拉伸性能并观察了拉伸断口形貌. 对比分析和定量计算表明, 随着拉伸温度的升高P原子在晶界偏聚的程度逐渐降低, 使得断口形貌的沿晶特征减弱、解理特征增强. 拉伸温度超过100℃以后沿晶断裂特征消失, 基体的屈服强度逐渐低于解理强度, 使得断口形貌解理特征减弱、韧窝特征增强, 至190℃转变成完全的韧窝断口. 在100℃ --160℃范围内拉伸变形时位错滑移会拖曳柯垂尔气团随之迁移, 造成了随温度升高延伸率下降, 且屈服强度的降幅减缓.

关键词 金属材料取向电工钢拉伸变形断口形貌偏聚    
Abstract

Tensile properties of grain-oriented electrical steels up to 300 were investigated and the corresponding fractography characteristics were observed. It was found that the segregation of phosphor atoms on grain boundaries was decreased with increasing tensile temperature, which resulted in enhancing cleavage fractography with reducing intergranular fracture. The intergranular fracture disappeared at the temperature over 100, while the yield strength of the matrix became obviously lower than its cleavage strength, which led to reducing cleavage fractography with enhancing dimples fracture that prevailed at 190. The Cottrell atmosphere would be trailed by the moving dislocations during the tensile deformation between 100–160, which induced decreasing elongation and limited yield strength drop with increasing deformation temperature.

Key wordsmetallic materials    grain-oriented electrical steels    tension deformation    fracture surfaces    segregation
收稿日期: 2009-04-01     
ZTFLH: 

TG111

 
作者简介: 国家自然科学基金50871015资助项目.

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