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首页> 外文会议>International Congress of Science and Technology of Metallurgy and Materials >Structural Evolution of Pearlite in Steels with Different Carbon Content under Drastic Deformation during Cold Drawing
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Structural Evolution of Pearlite in Steels with Different Carbon Content under Drastic Deformation during Cold Drawing

机译：冷绘时剧烈变形钢中珠光体在钢中珠光体的结构演变

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摘要

Steel wires, under severe cold drawing deformation, develop high strength. High carbon steel (00.80%) has a great demand in the steel market because of (he extremely high strength (5-6 GPa). For this reason it is relevant to increase the knowledge on the structural evolution and deformation mechanisms involved during wiredrawing process due to their critical applications, among which we can mention wires for: bridges, cranes and tire cord. The mechanical behaviour aptitude is determined by torsion test. When the fracture surface is flat, the wire is apt. On the opposite, an irregular fracture surface (delamination) means poor mechanical properties. This paper presents a comparative study on steel wires with different carbon contents (0.40% C and 0.80% C) in order to compare the structural evolution at high deformation and to verify the impact of carbon content on the pearlite deformation and cementite stability. Samples tested under torsion with and without delamination problems, were selected. The microstructural study was carried out applying light and scanning electron microscopy (SEM). Finally, the structural information was correlated with results of differential scanning calorimetry (DSC) and thermodynamic properties obtained by Fact Sage simulation. The structural study verified the presence of curling phenomenon in both steels grades, with different carbon content. The effect of the ferrite on deformation mechanisms during wiredrawing was clearly visualized. It was possible to verify differences (~ 26%) in the interlaminar spacing (X) of the pearlite between wires that present normal and delaminated behaviour under torsion test. The ductility loss (in the delaminated wire) is promoted by multiple causes: higher interlaminar spacing, high nitrogen content in the product and the presence of dynamic strain aging, which is promoted by cementite destabilization and the formation of e carbide.
机译：钢丝，在严重的冷拉伸变形下，发育高强度。高碳钢（00.80％）在钢铁市场上具有很大的需求，因为（他非常高的强度（5-6 GPA）。因此，它与在牵引过程中提高了对涉及的结构演变和变形机制的知识是相关的由于其关键应用，我们可以提及电线：桥梁，起重机和轮胎绳索。机械行为能力由扭转试验确定。当断裂表面平坦时，电线易于。相反，不规则的骨折表面（分层）意味着差的机械性能。本文介绍了不同碳含量（0.40％C和0.80％C）的钢丝的比较研究，以比较高变形的结构演变，并验证碳含量的影响选定珠光体变形和渗碳石稳定性。选择在扭转和没有分层问题的扭转下测试的样品。进行微观结构施加光和扫描宁电子显微镜（SEM）。最后，结构信息与差分扫描量热法（DSC）的结果相关，并通过事实验证仿真获得的热力学性质。结构研究验证了两个钢等级中卷曲现象的存在，具有不同的碳含量。铁素体对牵引期间变形机制的影响显现明显。在扭转试验下，可以验证珠光体之间的珠光体的间隔间距（X）中的差异（〜26％）。延展性损失（在分层线中）通过多种原因促进：较高的InterlaMinar间距，产品中的高氮含量以及动态应变老化的存在，其通过渗碳稳定化和E碳化物的形成促进。

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