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首页> 外文期刊>Journal of Materials Engineering and Performance >On the Microstructural and Mechanical Behavior of a Fe-0.3C-2.3Mn-0.22Si-0.5Cr-0.13Ti-0.005B Steel Intended for Automotive Applications
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On the Microstructural and Mechanical Behavior of a Fe-0.3C-2.3Mn-0.22Si-0.5Cr-0.13Ti-0.005B Steel Intended for Automotive Applications

机译：用于汽车应用的Fe-0.3C-2.3mn-0.22SI-0.5CR-0.13TI-0.005B钢的微观结构和力学行为

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摘要

The automotive industry is avid for improvements regarding the material's mechanical behavior. Specifically, a better balance of ultimate tensile strength (UTS) and elongation to fracture is desirable for safety enhancement. In this work, steel produced by vacuum induction melting was unidirectional hot rolled (UR) from 1150 to 870 degrees C. After UR, the plates were processed following two different routes: (1) water quenched (UR + WQ), and (2) water quenched plus a cryogenic treatment at - 180 degrees C (UR + WQ + CT). The latter route was proposed to completely transform the residual austenite and disperse the chromium carbides (CrxCy) and B-rich precipitates carbides into the martensite matrix. In both conditions, the microstructure revealed the presence of fine martensite with a lath-like morphology and [111]gamma habit plane indices. Relatively elevated mechanical properties were found such as a UTS of 1866.7 MPa for the UR + WQ steel. For the UR + WQ + CT condition, a UTS of 1744.8 MPa and an elongation of 30% were obtained. From the toughness exhibited by these steel conditions, they can be considered ideal candidates for the manufacture of automotive body parts such as side intrusion beams and bumper reinforcements.
机译：汽车行业渴望改善材料的机械性能。具体而言，提高安全性需要更好地平衡极限抗拉强度（UTS）和断裂伸长率。在这项工作中，通过真空感应熔炼生产的钢在1150到870摄氏度之间进行单向热轧（UR）。在UR之后，板材按照两种不同的路线进行加工：（1）水淬（UR+WQ）和（2）水淬加-180摄氏度的深冷处理（UR+WQ+CT）。后一种方法是完全转变残余奥氏体，并将铬碳化物（CrxCy）和富硼析出物碳化物分散到马氏体基体中。在这两种条件下，微观结构均显示出细小马氏体的存在，具有板条状形貌和[111]伽马惯习面指数。发现相对较高的机械性能，例如UR+WQ钢的UTS为1866.7 MPa。在UR+WQ+CT条件下，UTS为1744.8 MPa，伸长率为30%。从这些钢材条件所表现出的韧性来看，它们可以被认为是制造汽车车身零件（如侧防撞梁和保险杠加强件）的理想候选材料。

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