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利用专门设计的厚度方向缺口四点弯曲试样，结合相应的弹塑性有限元计算结果，在液氮温度下测取了一种海洋平台用钢的６种微观组织分层面上的解理断裂应力σ＊ｆ．结果显示，均匀细小的铁素体＋贝氏体组织具有比铁素体＋带状珠光体为高的σ＊ｆ值．对于同一终轧温度，轧后冷速愈高，其得到的微观组织之σ＊ｆ值愈高．而对于同一轧后冷却制度，则终轧于Ａｒ３与再结晶停止温度之间者其得到的微观组织具有最高的σ＊ｆ值．讨论了各微观组织组成相的作用
Using specially designed four-point bending specimen with thickness-direction notch, and combining with the corresponding elastoplastic finite element calculation results, cleavage fracture stress at six microstructure layers of a marine platform steel was measured at liquid nitrogen temperature σ * f. The results show that the uniformly fine ferrite + bainitic tissue has a higher σ * f value than ferrite + banded pearlite. For the same finishing temperature, the higher the cooling rate after rolling, the higher the σ * f value of the obtained microstructure. However, for the same post-rolling cooling system, the resulting microstructure has the highest σ * f value for the final rolling between Ar3 and the recrystallization stop temperature. Discuss the role of each phase of the microstructure