程学群
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李晓刚
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杜翠薇
中国腐蚀与防护学报
采用特制高压釜设备，研究304L不锈钢、316L不锈钢、317L不锈钢和镍基合金（Incoloy 800）在高温高压醋酸溶液中的腐蚀，初步探讨了不锈钢和镍基合金在醋酸溶液中的腐蚀机理及Ni和Mo元素对提高不锈钢耐蚀性能的影响。结果表明，温度对不锈钢和镍基合金耐蚀性有显著影响，随着温度的升高，腐蚀速率逐渐增大，当温度升高到一定值，不锈钢的耐蚀性会急剧下降。在低温醋酸溶液中，Ni对于提高不锈钢耐蚀性是有益的；在高温醋酸溶液中，Ni对于提高不锈钢耐蚀性没有显著影响。在低温醋酸溶液中，Mo对于提高不锈钢耐蚀性没有显著影响；在高温醋酸溶液中，Mo对于提高不锈钢耐蚀性是有益的。
关键词:
醋酸
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Stainless steel
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Nickel Based Alloy
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Corrosion
X.Q. Li
材料科学技术（英）
In current International Thermonuclear Experimental Reactor (ITER) design, the 316LN austenitic stainless steel (316LN SS) is used for first-wall/blanket structures. Thus, it is necessary to study the fundamental mechanical properties and irradiation effect of 316LN SS. A random solid solution model of Fe-Cr-Ni-Mn-Mo-Si alloy is used for describing 316LN SS. Using first-principles approaches, the elastic constants and ideal strength of the alloy were calculated. Such alloy exhibits good ductile behavior according to the theoretical values of Cauchy pressure and ratio of bulk modulus and shear modulus. Within the 256-atom supercell, inclusion of single vacancy defect further enhances the ductility of the alloy, and the existence of interstitial (Fe, H, He) atoms enhances the Young0s modulus.
关键词:
Stainless steel
Zhixia ZHANG
材料科学技术（英）
The precipitation of epsilon copper at 1023 K ageing in ferrite antibacterial stainless steel was investigated by a combination of electron microscopy and micro-Vickers hardness measurement. The results show that epsilon copper precipitation occurs within 90 s. Complex multilayer structure confirmed as twins and stacking faults on {111}ε-Cu planes was observed in the precipitates. The precipitates grow by the lengthwise enlargement of a set of parallel layers, having [111] ε-Cu and ε-Cu preferred growth orientations. The volume fraction of precipitates f formed within 120 min can be predicted by a modified Avrami equation ( ). Simultaneously, substituent atom clusters with a size of 5–10 nm was found to occur in the solution and cause matrix strain. The precipitate morphology and distribution on the surface of ferrite antibacterial stainless steel are associated with surface crystallographic orientation of the matrix. The precipitates are predominantly located within the ferrite grains of <110> orientation. The precipitates located on {111}α-Fe surface planes have sphere or ellipse shape.Key words: Stainless steel; Copper precipitation; Complex multilayer structure; Electron microscopy; Surface crystallographic orientation
关键词:
Stainless steel
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null
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null
Fatih Hayat
材料科学技术（英）
In this study, resistance spot weldability of 180 grade bake hardening steel (BH180), 7123 grade interstitial free steel (IF7123) and 304 grade austenitic stainless steel (AISI304L) with each other was investigated. In the joining process, electrode pressure and weld current were kept constant and six different weld time were chosen. Microstructure, microhardness, tensile-shear properties and fracture types of resistance spot welded joints were examined. In order to characterize the metallurgical structure of the welded joint, the microstructural profile was developed, and the relationship between mechanical properties and microstructure was determined. The change of weld time, nugget diameter, the HAZ (heat affected zone) width and the electrode immersion depth were also investigated. Welded joints were examined by SEM (scanning electron microscopy) images of fracture surface. As a result of the experiment, it was determined that with increasing weld time, tensile shear load bearing capacity (TLBC) increased with weld time up to 25 cycle and two types of tearing occurred. It was also determined that while the failure occurred from IF side at the BH180+IF7123 joint, it occurred from the BH180 side at the BH180+AISI304L joint.
关键词:
Resistance spot welding
T.Y.Soror
材料科学技术（英）
Medipolymorphol, a new sterol isolated from the whole plant of Medicago polymorpha Roxb was used as corrosion inhibitor for 316 stainless steel in 5% HCl at room temperature. Electrochemical techniques have been found to be reliable in evaluating corrosion characteristics of the system. Several techniques have been used including Tafel, linear polarization, potentiodynamic polarization, and open circuit potential (OCP) studies. The additives simultaneously deaccelerated the anodic process, intensified the cathodic process and provided a stable passive state, giving good inhibition efficiencies to stainless steel electrodes. In addition, adsorption isotherm have been fitted for the inhibitor under investigation.
关键词:
Medipolymorphol
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null
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null
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null
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null
唐子龙
,
宋诗哲
,
郭英凯
中国腐蚀与防护学报
采用原子吸收光谱(AAS),恒电位下电流～时间关系和极化曲线测试等方法研究了304不锈钢、纯铁、铬和镍四种材料在0.1mol/L HCl中的腐蚀行为及哌啶(PD)的缓蚀作用。结果表明:PD可有效地抑制304不锈钢在盐酸中的腐蚀。PD增强Cr在盐酸中的钝化性能,对铁、镍的腐蚀属阴极型缓蚀剂。AAS测试结果表明,304不锈钢的组分元素Fe、Cr、Ni和Mn在盐酸中分别以+2,+3,+2和+2价离子形式溶解,价态不受缓蚀剂的影响。PD对304不锈钢在盐酸中的腐蚀存在“选择性抑制”效应,能显著减缓Cr和Ni的溶解,改变各元素溶解的比例,导致耐蚀组分在电极表面富集。
关键词:
不锈钢
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Hydrochloric acid
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Piperidine
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Inhibition mechanism
