论文部分内容阅读
过去廿年来,应力腐蚀破裂是危害飞机骨架工业的一个主要问题。应力腐蚀破裂是持久的静张力和腐蚀的综合作用,此作用引起材料的过早破裂。虽然持久张应力的来源很多,但多次破裂都是由于残余应力或装配表面张应力在短横向方向影响的结果。大气中的水蒸气,可以是腐蚀介质,含有氯气的大气,或者零件放在不同于大气的腐蚀环境中都能大大加速腐蚀。应力腐蚀破裂发生在许多合金系中。在铝合金中,其特征是晶间破裂。
Stress corrosion cracking has been a major problem endangering the aircraft skeleton industry over the past two decades. Stress corrosion cracking is a combination of long-lasting static tension and corrosion that causes premature rupture of the material. Although there are many sources of long-lasting tensile stress, multiple ruptures are the result of residual stress or the influence of surface tension in the short transverse direction. Atmospheric water vapor, which can be corrosive media, atmospheres containing chlorine gas, or parts that are exposed to atmospheres that are different from those in the atmosphere, can greatly accelerate corrosion. Stress corrosion cracking occurs in many alloy systems. In aluminum alloys, it is characterized by intergranular cracking.