• Title/Summary/Keyword: 316L

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Surface and Corrosion Properties of Electrolytic Polished 316L Stainless Steel by Double Melting (VIM and VAR)

  • Hyunseung Lee;Gangsan Kim;Seungho Han;Man-Sik Kong;Jung-Yeul Yun;Si Young Chang
    • Journal of Korea Foundry Society
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    • v.43 no.5
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    • pp.223-229
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    • 2023
  • In this study, STS316L produced by a double-melting process involving vacuum induction melting (VIM) and vacuum arc remelting (VAR) was subjected to extrusion and drawing to form a tube and was subsequently electrolytic polished (EP). The grain size of the obtained STS316L without EP was approximately 55 ㎛, with no difference found after EP. The thickness of the EP layer was measured by AES and TEM, showing values of approximately 10 nm and 15 nm, respectively. After EP, the Cr/Fe and CrO/FeO ratios of the passive layer increased from 1.48 to 1.62 and from 2.15 to 2.26, respectively, while the surface roughness decreased significantly from 0.255 to 0.024 ㎛. Consequently, the corrosion rate decreased in both NaCl and HCl solutions after the EP process. Additionally, the amounts of eluted Cr and Fe ions were reduced from 1.2 to 0.8 ppb and 10.3 to 0.8 ppb, respectively. Furthermore, polarization tests revealed that STS316L treated with EP required a lower current density to reach a passive state, indicating that corrosion behavior was retarded.

A study on the corrosion behavior of Ni-Al electoplated 316L SS separator of molten carbonate fuel cells (Ni-Al이 전기도금된 용융탄산염 연료전지 분리판용 316L SS의 부식거동에 관한 연구)

  • 문영준;임희천;이덕열
    • 한국전기화학회:학술대회논문집
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    • 2001.06a
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    • pp.237-242
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    • 2001
  • 용융탄산염 연료전지에서 분리판으로 사용되는 316L 스테인리스 스틸의 내식성을 향상시키기 위해 Ni과 Al을 전기도금법에 의해 코팅하였으며 열처리를 통해 스테인리스 스틸표면에 $Ni_2Al_3$, NiAl 등의 금속간화합물을 형성시켰다. $62mol\%Li_2CO_3-38mol\%K_2CO_3$ 전해질 내에서 100시간 동안 침지실험을 수행한 결과 Al의 도금두께가 $10{\mu}m$ 이상인 경우에는 내식성이 상당히 향상되었음을 확인하였다.

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Pulsed Bias Inductively Coupled Plasma Nitriding of Chromium Electroplated AISI 316L Stainless Steel for PEMFC Application (고분자 전해질 연료전지에 적용하기 위한 크롬 도급 AISI 316L 스테인리스강의 펄스 바이어스 유도결합 플라즈마 질화)

  • Kim, Min-U;Han, Dong-Hun;Hong, Won-Hyeok;Lee, Jeong-Jung
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2009.05a
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    • pp.145-146
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    • 2009
  • 크롬 도금된 AISI 316L 스테인리스강에 펄스 바이어스를 사용한 유도결합 플라즈마로 질화 처리하여 고분자 전해질 연료전지용 분리판에 적합한 물성을 확인하였다.

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The corrosion and electrical property of AISI 316L by plasma nitriding (플라즈마 질화처리를 이용한 AISI 316L의 부식특성과 전기적 특성 분석)

  • Hong, Won-Hyeok;Han, Dong-Hun;Choe, Hyo-Seok;Lee, Jeong-Jung
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2009.05a
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    • pp.147-148
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    • 2009
  • 스테인리스강인 AISI 316L의 질화처리를 통하여 고분자 전해질 연료전지에 분리판에 적용가능한 특성을 측정하였다. 질화처리를 통하여 면간접촉저항을 $20m{\Omega}cm^2$ 정도로 낮게 만들었으며 부식특성도 원래의 스테인리스강과 비슷한 값을 나타내었다.

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고질소 첨가 316L 스테인리스강의 품질특성 연구

  • 김광태;이종석;이용득
    • Proceedings of the Korean Nuclear Society Conference
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    • 1995.05b
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    • pp.761-766
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    • 1995
  • STS 316L 강은 합금성분 중 탄소 함량을 0.03wt.% 이하로 규제하여 내식성이 향상되었고 용접 후 열처리가 불필요하여 널리 사용되어 왔으나, 탄소의 함량이 낮아 강도가 낮으므로 N을 첨가하여 강도를 높인 강으로 대체되는 추세이다. STS 316L 강에 첨가되는 N함량을 0.041∼0.15wt.% 범위로 변화시켜 N 첨가량에 따라 열간 압연 중 변형저항이 변화되는 정도를 측정하였으며, 동시에 최종제품의 기계적 성질, 입계예민화 정도, 충격특성 및 내 SCC성 변화를 조사하였다. N 첨가량이 증가할수록 열간 압연은 힘들어지나, 품질특성은 향상됨을 알 수 있었다.

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Development of a New LCF Life Prediction Model of 316L Stainless Steel at Elevated Temperature (316L 스테인리스 강의 고온 저주기 피로 수명식 개발)

  • Hong, Seong-Gu;Lee, Soon-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.521-527
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    • 2002
  • In this paper, tensile behavior and low cycle fatigue behavior of 316L stainless steel which is currently favored structural material for several high temperature components such as the liquid metal cooled fast breeder reactor (LMFBR) were investigated. Research was performed at 55$0^{\circ}C$, $600^{\circ}C$ and $650^{\circ}C$ since working temperature of 316L stainless steel in a real field is from 40$0^{\circ}C$ to $650^{\circ}C$. From tensile tests performed by strain controls with $1{\times}10^{-3}/s,\; l{\times}10^{ -4}/s \;and\; 1{\times}10/^{ -5}/ s $ strain rates at each temperature, negative strain rate response (that is, strain hardening decreases as strain rate increases) and negative temperature response were observed. Strain rate effect was relatively small compared with temperature effect. LCF tests with a constant total strain amplitude were performed by strain control with a high temperature extensometer at R.T, 55$0^{\circ}C$, $600^{\circ}C$, $650^{\circ}C$ and total strain amplitudes of 0.3%~0.8% were used and test strain rates were $1{times}10^{-2} /s,\; 1{times}10^{-3} /s\; and\; 1{times}10^{-4} /s$. A new energy based LCF life prediction model which can explain the effects of temperature, strain amplitude and strain rate on fatigue life was proposed and its excellency was verified by comparing with currently used models.

Study on Effect of Mechanical Machining and Heat Treatment on Surface Residual Stress of TP316L Stainless Steel (TP 316L 스테인리스강의 기계가공 및 열처리에 의한 표면잔류응력 특성 측정 연구)

  • Lee, Kyoung-Soo;Lee, Jeong-Keun;Song, Ki-O;Park, Jai-Hak
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.5
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    • pp.453-458
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    • 2011
  • We study the effect of mechanical machining and heat treatment on the surface residual stress of TP 316L stainless steel. Electrical discharge machining (EDM), milling and grinding were applied to TP 316L plate specimens. The residual stress and hardness were measured and the effect of heat treatment on the surface residual stress was examined. The residual stress was measured by the X-ray diffraction method, which showed that the surface residual stress was related only to the stress magnitude and was independent of the compressive or tensile component. The surface residual stress was greatly decreased by the heat treatment, but it was not removed completely.

A Study on Characteristics of Laser Cladding Layer of STS316L (STS316L 분말의 레이저 클래딩층 특성에 관한 연구)

  • Hong, SungMoo;Oh, JaeYong;Kim, DongSeob;Chang, SeungCheol;Shin, BoSung
    • Journal of the Microelectronics and Packaging Society
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    • v.24 no.3
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    • pp.53-56
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    • 2017
  • Laser cladding is a technique for forming beads by melt-sintering with a laser while directly feeding metal powder onto the base material through nozzles. This technique, which is applied in laser surface treatment technology, is useful for repairing broken or worn parts by allowing selective formation of the surface layer of the base metal material. In this paper, laser cladding process was performed on STS316L powder using high power continuous wave laser with IR wavelength and the cladding characteristics according to process conditions were experimentally analyzed.

The Crevice Corrosion Behavior of AISI 304 & 316L Stainless Steel Welded by TIG, MIG, CO2 and SMA (용접방법에 따른 AISI 304 및 316L스테인리스강 용접부의 틈부식 거동)

  • 백신영
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.4
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    • pp.22-28
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    • 1991
  • The crevice corrosion behavior on austenitic AISI 304 and 316L stainless steel welded by TIG, MIG, $CO_2$ and SMA was studied. The results are as follows : In 10% $FeCl_3$ solution and natural sea water sampled near Mokpo port, the base metal of 304 stainless steel showed small amount corrosion, whereas 316L stainless steel did not showed any corrosion in the test periods. The weight loss caused by crevice corrosion increased with increasing weld heat input and residual .delta. ferrite formed in welded part. The corrosion resistance of the welded part was in the order of TIG, MIG, $CO_2$ and SMA. From this tendency, it is proved that the smaller heat input gives the better corrosion resistance.

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