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金属材料在腐蚀介质、温度环境等条件的影响下,产生沿晶或穿晶脆性断裂的现象,通常称之为环境断裂失效;经常接触到的环境断裂失效有:(1)腐蚀疲劳断裂失效;(2)应力腐蚀断裂失效;(3)氢脆断裂失效等三种类型。第一节腐蚀疲劳断裂失效分析 1 腐蚀疲劳的识别腐蚀疲劳的损伤,在表面腐蚀破坏的程度依赖于试样浸泡在腐蚀介质中的时间。腐蚀疲劳对腐蚀环境没有特殊的要求,只要环境对材料有腐蚀作用,再加上有循环应力的作用都可以产生腐蚀疲劳断裂失效。由于腐蚀疲劳断裂面要受到不同程度的腐蚀介质的作用,因此可以据此来判别腐蚀疲劳与一般疲劳的差异,这一点用腐蚀疲劳断口的宏观形貌就能鉴别出来。
Under the influence of corrosive media, temperature environment and other conditions, the metal material has the phenomenon of brittle fracture along the crystal or transgranular. It is often referred to as environmental fracture failure. The frequently encountered environmental failure faults are: (1) corrosion fatigue fracture failure; (2) stress corrosion cracking failure; (3) hydrogen embrittlement fracture failure and other three types. Section 1 Failure Analysis of Fatigue Crack Failure 1 Identification of corrosion fatigue Corrosion fatigue damage, the degree of corrosion damage on the surface depends on the sample immersed in the corrosive medium time. Corrosion Fatigue has no special requirements on the corrosive environment. As long as the environment has a corrosive effect on the material, together with the effect of cyclic stress, corrosion fatigue failure can be caused. As the corrosion fatigue fracture surface to be subject to varying degrees of corrosive media, so you can determine the difference between corrosion fatigue and general fatigue, which is the use of corrosion fatigue fracture macro-morphology can be identified.