Influence of Austenite Conditioning on the Mechanical Properties of a Microalloyed Bainitic Steel
Influence of Austenite Conditioning on the Mechanical Properties of a Microalloyed Bainitic Steel
复制标题
DOI：
10.1002/srin.201800584
复制
发表时间：
2019-03
影响因子：
2.2
通讯作者：
M. Menzel;W. Bleck;Anastasia Höhne;Gerhard Gevelmann;A. Tomitz;J. Gibson;S. Korte-Kerzel
中科院分区：
文献类型：
--
作者：
M. Menzel;W. Bleck;Anastasia Höhne;Gerhard Gevelmann;A. Tomitz;J. Gibson;S. Korte-Kerzel
研究了不同热轧工艺参数对微合金化贝氏体钢相变及最终性能的影响。通过热机械试验分析了其对强度和韧性的影响。透射电子显微镜，纳米压痕，和电子探针显微分析被用来调查的微观结构特征及其对机械性能的影响。特别地，发现微合金钢的热机械处理导致强度、应变硬化和韧性的增加。这与受转变影响的微观结构、碳分配以及部分应变诱导沉淀有关。显著的应变硬化通过精细分散的马氏体/奥氏体岛实现。相反，粗马氏体/奥氏体成分降低韧性。此外，应变诱导的钛沉淀有助于高屈服强度。
The effects of different hot strip rolling process parameters on the phase transformation and the final properties of a microalloyed bainitic steel are investigated. Thermomechanical tests are conducted to analyze the influence on strength and toughness. Transmission electron microscopy, nanoindentation, and electron probe microanalysis are used to investigate the microstructural features and their impact on the mechanical properties. In particular, it is found that a thermomechanical treatment of the microalloyed steel leads to an increase in strength, strain hardening, and toughness. This is related to the microstructure influenced by the transformation, the carbon partitioning, and partly to strain‐induced precipitations. The pronounced strain hardening is achieved by finely dispersed martensite/austenite islands. In contrast, coarse martensite/austenite constituents reduce the toughness. Further, strain induced titanium precipitations contribute to the high yield strength.