【Corrosion Technology Edition】Daily Question 20170801: What is stress corrosion cracking?
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To boost the popularity of the Mechanical Equipment Corrosion Technology section, enhance communication among users, and enable everyone to learn together, progress together, and improve together, the 【Question of the Day】 activity has been launched. Reward rules: 3 wealth points for replying, 10 wealth points for a correct answer. This topic is valid for two days; no scoring will be given after that. Term explanation: What is stress corrosion cracking? Stress corrosion cracking refers to the brittle fracture of metal materials under tensile stress, in certain specific environmental conditions, resulting from the combined effect of corrosion and stress. ================================== Event Promotion: Petrochemical Zone – “Creative Ideas for Energy Saving” event (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Stress corrosion cracking is a general term referring to the mutual failure of alloys under stress in corrosive environments due to the propagation of cracks.
Stress corrosion cracking: The brittle cracking that occurs in metal materials under the combined action of tensile stress and a corrosive environment is known as stress corrosion cracking. Stress includes the effect of external loads, thermal stress, as well as residual stresses generated after hot or cold working or welding. It is characterized by the appearance of cracks or even fractures, with the origin of these cracks often being at the bottom of pitting corrosion holes or corrosion pits; crack propagation occurs in three ways: intergranular, transgranular, and mixed ； The main crack is usually perpendicular to the stress direction and often has branches; its ends are sharp, the degree of corrosion on the inner walls of the crack and on the metal surface is generally very slight, the crack expands at a rapid rate at its ends, and the fracture surface exhibits characteristics of brittle fracture. Stress corrosion cracking can occur over a very wide range of materials; aside from pure metals, almost all alloys will experience stress corrosion cracking as long as they are in a certain environment. Chlorides, alkalis, and hydrogen sulfide are the three main agents that cause stress corrosion cracking. Equipment such as liquid ammonia storage tanks made of low-alloy steel, and carbon dioxide regeneration towers (using thermal potassium carbonate as a medium) in 300,000 tons/year ammonia synthesis plants can also suffer from stress corrosion failure.
Alloys under stress fail in corrosive environments due to crack propagation
Stress corrosion cracking is a general term referring to the mutual failure of alloys under stress in corrosive environments due to the propagation of cracks.
Stress corrosion cracking is a general term referring to the mutual failure of alloys under stress in corrosive environments due to the propagation of cracks.
Stress corrosion cracking refers to the brittle fracture of metal materials under tensile stress, which occurs under certain specific environmental conditions due to the combined effect of corrosion and stress.
The combined effect of corrosion and stress leads to a decrease in the strength of the metal, ultimately resulting in cracking
Stress corrosion cracking refers to the brittle fracture of metal materials under tensile stress, which occurs under certain specific environmental conditions due to the combined effect of corrosion and stress.
It refers to the brittle fracture phenomenon that occurs in metal materials under tensile stress, in certain specific media, as a result of the combined effect of the corrosive medium and the stress.