摘要
用金相显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)和背散射电子衍射(EBSD)等实验技术,研究了压力容器钢板SA516Gr70的显微组织和晶粒取向分布。根据多晶体塑性变形模型,预测了钢板的屈服表面。实验和计算结果表明,钢板的显微组织均为铁素体和珠光体,心部晶粒尺寸明显大于表层晶粒尺寸;钢板热轧后的主要织构组分是{111}<110>、{111}<112>和{001}<110>;限制条件对屈服表面影响较大,随着松弛限制的晶粒体积分数增加,屈服表面缩小,沿轧向的平面应变屈服应力逐渐大于沿横向的平面应变屈服应力。
The microstructure and grain orientation distribution of SA516Gr70 steel plate were investigated by means of optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD) and electron backscatter diffraction(EBSD) techniques.The yield surface of the steel plate was predicted based on the polycrystalline plastic deformation model.The results show that the microstructure is ferrite and pearlite for both normalized and tempered after normalized,and the grain size in the center is bigger than that of in the surface.The dominant texture component is {111}<110>,{111}<112> and {112}<110> texture according to the results of experiments.The constraint conditions have significant effects on the yield surfaces.The yield surfaces shrinked as the augmentation of volume fraction relaxed constraints and yield stress along RD is greater than that of along TD.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第S1期102-107,共6页
Transactions of Materials and Heat Treatment
