Shot-peening 표면처리된 Ti함유 스테인리스강의 응력균열부식
Stress Corrosion Cracking Characteristics of Shot-peened Stainless Steel Containing Ti
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Abstract
Stress corrosion cracking(SCC) characteristics of shot-peened stainless steel containing Ti (0.09wt%-0.92wt%) fabricated by the vacuum furnace were investigated using SCC tester and potentiostat. The homogenization and the sensitization treatment were carried out at 1050oC for 1hr and 650oC for 5hr. The samples for SCC were shot-peened using F0.6 mm steel ball for 4 min and 10 min. Intergranular and pitting corrosion characteristics were investigated by using EPR and CPPT. SCC test was carried out at the condition of 288oC, 90 kgf pressure, water with 8 ppm dissolved oxygen, and 8.30-7/s strain rate. After the corrosion and SCC test, the surface of the tested specimen was observed by the optical microscope, TEM and SEM. Specimen with Ti/C ratio of 6.14 showed high tensile strength at the sensitization treatment. The tensile strength decreased with the increase of the Ti/C ratio. Pitting and intergranular corrosion resistance increased with the increase of Ti/C ratio. Stress corrosion cracking strength of shot-peened specimen was higher than that of non shot-peened specimen. Stress corrosion cracking strength decreased with the increase of the Ti/C ratio.
참고문헌 (6)
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