Effect of tellurium on the deformation of sulfides in rolling process
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摘要: 采用扫描电镜对38MnVS6钢中Te的赋存状态进行了分析，采用Gleeble-3500模拟了轧制过程。对MnS夹杂和基体的硬度进行了检测，并对夹杂物进行了统计，由此对夹杂物的变形行为进行研究。结果表明，少量的Te首先固溶在MnS中，当Te含量超过130×10−6时开始析出MnTe。经过热压缩后，随着Te含量的增加，夹杂物的长宽比从2.3逐渐降低至1.8左右。钢中Te含量增加，夹杂物与钢基体的硬度比H夹/H钢基本为一个常数，不能造成夹杂物的抗变形能力增加。经过热压缩后，较小的夹杂物其长宽比也较小。钢中加Te后可使夹杂物尺寸减小，进而减小了夹杂物的变形量，抑制了轧制过程中夹杂物的变形。Abstract: Modification of MnS inclusion by Te is one of the most efficient methods to improve the morphology and distribution of MnS inclusions. However, previous researches did not generate acceptable opinions on the deformation behaviors of MnS inclusions during the rolling process after adding Te. In the present study, the existing form of Te in the 38MnVS6 steel was detected by SEM-EDS. Gleeble-3500 was employed to simulate the rolling process. The hardness of MnS inclusions and steel matrix was measured and the statistics of inclusions were performed to analyze the effect of Te on the deformability of inclusions. The results show that Te initially dissolves in MnS inclusion after adding a small amount of Te. When the Te content reaches 130 ×10−6, MnTe starts to generate. After hot-pressing, the inclusions were deformed. With the increase of Te content, the aspect ratio of inclusions decreases from 2.3 to approximately 1.8 and gradually reaches a constant value. The hardness determination result indicates that the deformation resistance of inclusions is not caused by the increase of inclusion hardness, since the hardness ratio
Hinclusion/ Hmatrix keeps relatively constant after adding different Te content. The statistics of inclusions prove that the inclusion with a small diameter shows low aspect ratio after hot-pressing. The addition of Te can reduce the size of inclusions, leading to less deformation of inclusions. -
Key words:
- 38MnVS6 /
- Te /
- MnS inclusion /
- Gleeble
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图 2 不同Te含量的钢中MnS夹杂中平均Te/S值
Figure 2. Te/S value in MnS inclusions in steels with different Te contents
图 6 模拟轧制后钢中夹杂物平均长宽比
Figure 6. Average aspect ratio of inclusions in steels after the simulation of rolling process
图 7 不同Te含量的钢中夹杂物及钢基体载荷-深度曲线
Figure 7. Load versus indenter displacement curve for inclusion and matrix in steels with different Te contents
图 8 不同Te含量的钢中夹杂物及钢基体硬度
Figure 8. Hardness of inclusion and matrix in steels with different Te contents
图 9 Te含量对夹杂物平均等效直径的影响
Figure 9. Effect of Te content on the average equivalent diameter of inclusions
图 10 不同尺寸范围内夹杂物的长宽比
Figure 10. Average aspect ratio of inclusions in different diameter ranges
表 1 原始38MnVS6钢成分
Table 1. Chemical compositions of original 38MnVS6 steel
% C Si Mn P S Cr V Al Ti Nb Ni 0.383 0.574 1.399 0.01 0.051 0.179 0.099 0.018 0.017 0.016 0.123 
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表 2 不同钢中Te含量×106
Table 2. Te content in different steels
1 2 3 4 5 6 7 8 9 10 0 3.4 8.5 22 38 46 130 230 320 400
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