Research on hot deformation behavior of MnS inclusions in gear steel
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摘要: 利用Gleeble-1500热-力学模拟试验机对齿轮钢试样进行压缩试验，研究了不同变形温度、变形量对钢中硫化锰夹杂物形貌、尺寸及相对塑性的影响。研究发现，在变形过程中，硫化物的碎化与长大现象交替进行，变形温度与变形量对硫化锰夹杂物的尺寸影响较大。随着变形量的增加，低温时长宽比小于2的硫化物数量呈先降低后增多的趋势，同时相对塑性呈现降低的趋势，高温时长宽比小于2的硫化物数量呈先增大后降低的趋势，相对塑性呈现增加的趋势。在实际轧制过程中选择低温大变形量或高温小变形量轧制制度，能够获得数量较多，长宽比较小的硫化锰夹杂物。Abstract: A compression test was conducted via a Gleeble-1500 thermo-mechanical simulator. The effects of different deformation temperatures and deformation on the size and relative plasticity of MnS inclusions in steel were studied. It is found that fragmentation and growth of MnS occurred alternately during the deformation process, and the temperature and the deformation greatly influence the size of MnS. With the increase of deformation, the quantity of MnS with an aspect ratio of less than two decreases first and then increases. The relative plasticity shows a trend to decrease at low temperatures. Nevertheless, the quantity and relative plasticity of MnS changed oppositely when gear steel was deformed at high temperatures. Choosing large deformation at low temperature or small deformation at the high-temperature rolling system in actual production can obtain many MnS inclusions with a small aspect ratio.
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Key words:
- gear steel /
- MnS inclusions /
- deformation /
- deformation temperature /
- relative plasticity
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图 1 Gleeble-1500热-力学模拟试验机加热及变形制度
Figure 1. Heating and deformation schedule of Gleeble-1500 thermo-mechanical simulator
图 2 变形温度和变形量对MnS夹杂物形貌的影响
Figure 2. Effect of deformation temperature and deformation amount on morphology of MnS inclusions
图 3 热变形参数对硫化物长宽比分布的影响
Figure 3. Effect of thermal deformation parameters on the aspect ratio distribution of sulfide
图 5 变形参数对硫化物相对塑性的影响
Figure 5. Effect of deformation parameters on relative plasticity of sulfide
表 1 试验钢化学成分
Table 1. Chemical composition of test steel
% C Si Mn P S Nb+Ti+Cr+Mo Fe ≤0.25 ≤0.6 ≤2.0 ≤0.018 ≤0.01 ≤0.2 余量 
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