Intergranular corrosion behavior and mechanism of the stabilized ultra-pure 430LX ferritic stainless steel

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（8）
• 页码范围: 1787-1796
• 页数: 10页
• 语种: 英文

摘要

Intergranular corrosion (IGC) behavior of the stabilized ultra-pure 430LX ferritic stainless steel (FS) was investigated by using double loop electrochemical potentiokinetic reactivation (DL-EPR) and oxalic acid etch tests to measure the susceptibility of specimens given a two-step heat treatment.The results reveal that IGC occurs in the specimens aged at the temperature range of 600-750 ℃ for a short time.The aging time that is required to cause IGC decreases with the increase of aging temperature.A longer aging treatment can reduce the susceptibility to IGC.The microstructural observation shows that M23C6 precipitates form along the grain boundaries,leading to the formation of Cr-depleted zones.The presence of Cr-depleted zones results in the susceptibility to IGC.However,the atoms of stabilizing elements replace chromium atoms to form MC precipitates after long-time aging treatment,resulting in the chromium replenishment of Cr-depleted zones and the reduction of the susceptibility to IGC.