High temperature mechanical properties and hot working properties of high magnetic orientation silicon steel
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摘要: 采用Gleeble3800热模拟试验机对高磁感取向硅钢铸坯进行高温拉伸和高温压缩试验，研究温度对高磁感取向硅钢的高温力学性能（抗拉强度和断面收缩率）的影响关系，同时研究了高磁感取向硅钢的热加工性能。结果表明，高磁感取向硅钢的第Ⅰ脆性区温度为熔点～1200 ℃，第Ⅲ脆性区温度为750 ℃附近，不存在第Ⅱ脆性区；750 ℃试样断裂机制为沿晶脆性，且在断口处存在Al、Si等的氧化夹杂物；当形变量和温度一定的情况下，试样随应变速率增大，变形抗力大幅提高。Abstract: In this paper, Gleeble3800 thermal simulation test machine was used to conduct high temperature tensile and high temperature compression experiments on high magnetic induction oriented silicon steel billets. The influence of temperature on high temperature mechanical properties (tensile strength and section shrinkage) of high magnetic induction oriented silicon steel, and the hot working properties of high magnetic induction oriented silicon steel were studied. The results showed that the temperature of the first brittle zone of high magnetic orientation silicon steel was around the melting point ～1200 ℃, and the temperature of the third brittle zone was about 750 ℃, and there was no second brittle zone. The fracture mechanism of the sample at 750 ℃ is intergranular brittle fracture, and there are Al, Si and other oxidation inclusions at the fracture surface. When the shape variable and temperature are constant, the deformation resistance of the specimen increases with the increase of strain rate.
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图 1 抗拉强度和断面伸缩率随温度的变化曲线
Figure 1. Variation of tensile strength and section shrinkage with temperature
图 2 少量C对Fe-Si相图中α和γ相线的影响
Figure 2. Effect of a small amount of C on α and γ phase lines in Fe-Si phase diagram
图 3 试样在不同温度拉断时断口宏观形貌照片
Figure 3. Macroscopic morphology of the specimens pulled at different temperatures
图 4 试样在不同温度拉断时断口微观形貌照片
Figure 4. Fractograph of the samples pulled at different temperatures
图 5 750 ℃时试样断口形貌扫描电镜照片与能谱
Figure 5. SEM images and energy spectrum of the fracture morphology at 750 ℃
图 6 1 s−1和5 s−1应变速率下变形量对高温变形抗力的变化曲线
Figure 6. Variation curves of high temperature deformation resistance at strain rates 1 s−1 and 5 s−1
图 7 不同应变速率下高温变形抗力的变化曲线
Figure 7. Variation curves of high temperature deformation resistance at different strain rates
表 1 试样的主要化学成分
Table 1. Main chemical composition of samples
% C Si Mn P S Cr 0.05～0.06 3.0～3.3 0.08～0.1 0.02～0.03 0.005～0.009 ＜0.15 
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表 2 拉伸试验数据
Table 2. Tensile tests data
测试温度/℃ 断后总长度/mm 断面收缩率/％ 抗拉强度/MPa 650 124.93 67.60 106.7 700 124.95 68.27 76.4 750 123.53 53.76 78.2 800 125.21 70.66 56.3 850 127.49 83.66 42.2 900 127.34 82.22 35.7 950 127.56 86.86 25.9 1000 127.20 82.60 27.8 1050 124.83 74.41 16.8 1100 124.42 72.09 15.0 1150 124.35 72.35 11.7 1200 122.54 45.73 8.2
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