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SA516 Gr70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.
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