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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Microstructure and Mechanical Properties of Thermomechanically Processed and Bake-Hardened Nb-Mo-Al TRIP Steel
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Microstructure and Mechanical Properties of Thermomechanically Processed and Bake-Hardened Nb-Mo-Al TRIP Steel

机译：Nb-Mo-Al TRIP热机械加工和烘烤硬化的显微组织和力学性能

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摘要

The effect of bake hardening and pre-straining plus bake-hardening on the microstructure, and mechanical properties has been investigates in a thermomechanically processed (TMP) TRIP steel alloyed with Nb, Mo and Al. The steel was characterised before and after bake hardening by transmission electron microscopy (TEM), X-ray diffraction.(XRD), atom probe tomography (APT) and tensile tests. The microstructure of the thermomechanically processed TRIP steel consisted of polygonal ferrite, bainite, retained austenite and martensite. Fine Nb carbides were detected in the microstructure by TEM. In addition, APT has revealed the presence of Nb-, Mo-, Fe-, C- containing clusters. Bake hardening was performed on samples with and without 4% pre-strain. The observed higher yield strength of bake-hardened samples in comparison with the TMP samples was due to the interaction of dislocations with the iron and niobium carbides, as well as C-Nb-Mo-Fe clusters. The pre-straining and bake-hardening treatment led to the further increase in the yield strength due to the increase in the number density of dislocations, fine particles and clusters.
机译：在含Nb，Mo和Al的热机械加工（TMP）TRIP钢中，已经研究了烘烤硬化和预应变加上烘烤硬化对显微组织和机械性能的影响。通过透射电子显微镜（TEM），X射线衍射（XRD），原子探针断层扫描（APT）和拉伸试验对烘烤硬化前后的钢进行了表征。热机械加工的TRIP钢的显微组织由多边形铁素体，贝氏体，残余奥氏体和马氏体组成。通过TEM在显微组织中检测到细小的Nb碳化物。此外，APT还揭示了含Nb，Mo，Fe，C的团簇的存在。在有和没有4％预应变的样品上进行烘烤硬化。与TMP样品相比，观察到烘烤硬化的样品具有更高的屈服强度，这是由于位错与铁和铌碳化物以及C-Nb-Mo-Fe团簇的相互作用所致。由于位错，细小颗粒和团簇的数量密度增加，预应变和烘烤硬化处理导致了屈服强度的进一步提高。

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