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首页> 外文期刊>Journal of Materials Engineering and Performance >Development of Highly Ductile Spheroidized Steel from High C (0.61 wt.% C) Low-Alloy Steel
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Development of Highly Ductile Spheroidized Steel from High C (0.61 wt.% C) Low-Alloy Steel

机译：由高碳（0.61 wt。％C）低合金钢开发高延展性球化钢

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摘要

This research aims to develop a multiphase steel combining spheroidal cementite and bainite in ductile ferrite matrix possessing an optimal balance of reasonably high strength and excellent ductility. A high carbon (0.61 wt.%) high silicon (1.71 wt.%) EN45 spring steel was annealed to obtain ferrite pearlite microstructure. The samples were given 5 and 10% cold rolling followed by holding at temperature below Ac1 for about 3 h. The samples were then held in intercritical range at 770 degrees C temperature for different durations ranging from 5 to 20 min for partial re-austenitization followed by quenching in a salt bath maintained at 350 degrees C and holding for 10 min to get bainite. The samples were finally water quenched. Characterizations of the samples with the help of optical microscopy, x-ray diffraction, scanning electron microscopy, and atomic force microscopy were carried out. Optimal heat-treatment conditions were found out after correlating with tensile properties. The best combination of high tensile strength (similar to 800 MPa) with very high elongation (similar to 29%) was obtained. Effects of cold-rolled strain and holding time in the intercritical region on the mechanical properties and microstructural changes were studied. Finally, structural property correlation is established.
机译：本研究的目的是开发一种球状渗碳体和贝氏体相结合的延性铁素体基体的多相钢，该钢具有合理平衡的高强度和优良延性。对高碳（0.61 wt。％）高硅（1.71 wt。％）EN45弹簧钢进行退火，以获得铁素体珠光体显微组织。对样品进行5％和10％的冷轧，然后在低于Ac1的温度下保持约3小时。然后将样品在770°C的临界范围内保持5至20分钟的不同持续时间，以进行部分再奥氏体化，然后在保持在350℃的盐浴中淬火并保持10分钟以得到贝氏体。最后将样品用水淬灭。借助光学显微镜，X射线衍射，扫描电子显微镜和原子力显微镜对样品进行表征。在与拉伸性能相关之后，找到了最佳的热处理条件。获得了高拉伸强度（约800 MPa）和非常高的伸长率（约29％）的最佳组合。研究了临界区间冷轧应变和保持时间对力学性能和微观组织变化的影响。最后，建立了结构特性的相关性。

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