论文部分内容阅读
一、前言船体钢在海水中的腐蚀疲劳是船舶结构破坏的主要形式。设计舰船壳体阴极保护系统时通常着眼于防腐蚀效果,并不考虑对船体结构强度的影响。已有的研究资料指出,阴极保护可提高光滑试佯的腐蚀疲劳强度,但对疲劳裂纹扩展速率影响的看法存在分岐。有人认为,阴极保护加速疲劳裂纹扩展;也有人认为,在一定条件下阴极保护会阻碍疲劳裂纹扩展。本工作在实验室条件下研究介质和阴极保护电位对长、短疲劳裂纹扩展行为的影响。二、材料及试验方法试材采用调质态12CrNi3MoV钢,化学成份见表1,机械性能见表2。
I. INTRODUCTION The corrosion fatigue of hull steel in seawater is the main form of damage to the structure of the ship. The design of the cathodic protection system of a ship’s shell usually focuses on the anti-corrosion effect and does not consider the impact on the hull structural strength. The existing research indicates that cathodic protection can improve the corrosion fatigue strength of smooth test, but there is a disagreement on the influence of fatigue crack growth rate. Some believe that cathodic protection accelerates fatigue crack growth; others believe that under certain conditions, cathodic protection may hinder fatigue crack growth. This work under laboratory conditions to study the medium and cathodic protection potential long and short fatigue crack growth behavior. Second, materials and test methods The quenched and tempered 12CrNi3MoV test steel, the chemical composition shown in Table 1, mechanical properties in Table 2.