Themicrostructure of bonded zone consist of upper bainite and grain boundary ferrite.
接合部组织由晶界铁素体及晶内上贝氏体组成。
The welded metal consists of grain boundary ferrite, ferrite side plate and acicular ferrite.
焊缝组织主要由晶界铁素体、侧板条铁素体和针状铁素体组成；
The relative amount of IAF and the morphology of grain boundary ferrite in HAZ were the decisive factors affecting the strength and toughness of HAZ.
HAZ组织中IAF相对数量及晶界铁素体的形态是影响HAZ强韧性的决定性因素。
Experiments show that pearlitic nucleus can form on the austenitic grain boundary, and there is the orientation relationship between ferrite and cementite also.
实验表明，珠光体分解在奥氏体晶界形核，铁素体和渗碳体具有位向关系。
The presence of grain boundary allotriomorphic ferrite can increase the compatible deformation capability of duplex microstructure, improve the crack initiation energy under impact loading;
适量仿晶界型铁素体的存在增加了复相组织的协调变形能力，提高了裂纹形成功；
The presence of grain boundary allotriomorphic ferrite can increase the compatible deformation capability of duplex microstructure, improve the crack initiation energy under impact loading;
适量仿晶界型铁素体的存在增加了复相组织的协调变形能力，提高了裂纹形成功；
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