Improved Mechanical Properties by Control of Bainite Transformation
Improved Mechanical Properties by Control of Bainite Transformation
复制标题
通过控制贝氏体转变提高机械性能
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
F. Gerdemann
中科院分区：
文献类型：
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作者：
W. Bleck;F. Gerdemann
术语贝氏体描述了可以通过连续冷却或等温热处理产生的各种不同的微观结构。基于系统的显微组织调查，贝氏体表征方案已开发出不同的基本结构和子结构之间的区别，后者被描述的位置，类型和形式。根据该详细描述，已经使用光学显微镜（LOM）、扫描电子显微镜（SEM）和电子束背散射衍射（EBSD）技术定量分析了微观结构。一些微观结构特征可以进一步通过纳米硬度测量来表征。用扫描电镜研究了不同贝氏体形态的相变动力学。动力学的显着不同，这取决于在相变过程中所涉及的扩散量。几种数值方法已经过测试和严格评估，以描述的动力学。此外，对于不同的钢组，显微组织与性能的关系进行了研究，重点是裂纹的发展。由此，可以推导出具有改进的强度和延展性的平衡以及改进的韧性的优化贝氏体钢的建议。
The term bainite describes a variety of different microstructures that can be generated by continuous cooling or isothermal heat treatments. Based on systematic microstructural investigations, a bainite characterization scheme has been developed that distinguishes between different basic structures and substructures, the latter being described by location, type, and form. According to this detailed description, microstructures have been quantitatively analyzed using light optical microscope (LOM), scanning electron microscope (SEM), and electron beam backscatter diffraction (EBSD)-techniques. Some of the microstructural features can be further characterized by nano-hardness measurements. The transformation kinetics of different bainite forms has been determined by dilatometer studies. The kinetics differs significantly depending on the amount of diffusion involved during the phase transformation. Several numerical approaches have been tested and critically evaluated in order to describe the kinetics. Furthermore, for various steel groups, microstructure-property relations have been investigated with a focus on the development of cracks. By this, recommendations for optimized bainitic steels with improved balance of strength and ductility as wells as improved toughness can be deduced.