ELECTROCHEMICAL STUDIES ON THE MECHANISM OF GOLD DISSOLUTION IN THIOSULFATE SOLUTIONS

ＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＩＥＳＯＮＴＨＥＭＥＣＨＡＮＩＳＭＯＦＧＯＬＤＤＩＳＳＯＬＵＴＩＯＮＩＮＴＨＩＯＳＵＬＦＡＴＥＳＯＬＵＴＩＯＮＳＺｈｕ，Ｇｕｏｃａｉ；Ｆａｎｇ，Ｚｈａｏｈｅｎｇ；Ｃｈｅｎ，Ｊｉａｙｏｎｇ（ＩｎＳｔｄｕｔｅｏｆＣｈ...     

THE RELATIONSHIPS BETWEEN GLOBAL AND EVERY LAYER DEFORMATION TEXTURES OF 70－30 BRASS ROLLED BY CROSS SHEAR ROLLING

ＴＨＥＲＥＬＡＴＩＯＮＳＨＩＰＳＢＥＴＷＥＥＮＧＬＯＢＡＬＡＮＤＥＶＥＲＹＬＡＹＥＲＤＥＦＯＲＭＡＴＩＯＮＴＥＸＴＵＲＥＳＯＦ７０－３０ＢＲＡＳＳＲＯＬＬＥＤＢＹＣＲＯＳＳＳＨＥＡＲＲＯＬＬＩＮＧ￥Ｚｈａｏ，Ｘｉａｎｇ；Ｚｕｏ，Ｌｉａｎｇ；Ｚｈａｏ，...     

INTERACTION OF PARTICLES WITH A SOLIDIFIED INTERFACE DURING SOLIDIFICATION OF METAL MATRIX COMPOSITE REINFORCED WITH PARTICLES

ＩＮＴＥＲＡＣＴＩＯＮＯＦＰＡＲＴＩＣＬＥＳＷＩＴＨＡＳＯＬＩＤＩＦＩＥＤＩＮＴＥＲＦＡＣＥＤＵＲＩＮＧＳＯＬＩＤＩＦＩＣＡＴＩＯＮＯＦＭＥＴＡＬＭＡＴＲＩＸＣＯＭＰＯＳＩＴＥＲＥＩＮＦＯＲＣＥＤＷＩＴＨＰＡＲＴＩＣＬＥＳＣＨＵＳｈｕａｎｇｊｉｅ;Ｗ...     

DEVELOPING MULTIPHASE AL_3Ti ALLOYS

ＤＥＶＥＬＯＰＩＮＧＭＵＬＴＩＰＨＡＳＥＡＬ_３ＴｉＡＬＬＯＹＳＷＡＮＧＱｉａｎ；ＷＡＮＧＪｉａｎ；ＷＥＮＧＸｉａｏｊｕｎ；ＳＵＮＪｉａｎ；ＣＨＥＮＳｈｉｐｕ；ＨＵＧｅｎｇｘｉａｎｇ（ＳｈａｎｇｈａｉＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｎｇｈ?..     

PHOTOELECTROCHEMICAL STUDY OF PASSIVE LAYERS ON COPPER ELECTRODES IN SOME ALKALINE MEDIA

ＰＨＯＴＯＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＳＴＵＤＹＯＦＰＡＳＳＩＶＥＬＡＹＥＲＳＯＮＣＯＰＰＥＲＥＬＥＣＴＲＯＤＥＳＩＮＳＯＭＥＡＬＫＡＬＩＮＥＭＥＤＩＡ①Ａ．Ｋａｍｋｉｎａ,１,ＺｈｏｕＧｕｏｄｉｎｇａ,ＸｕＱｕｎｊｉｅｂａｎｄＢ．Ｈ．ｃＬｏｏａＥ...     

A CASE STUDY ON LONG HOLE RAISING BY SHOOTING TO RELIEF HOLES

ＡＣＡＳＥＳＴＵＤＹＯＮＬＯＮＧＨＯＬＥＲＡＩＳＩＮＧＢＹＳＨＯＯＴＩＮＧＴＯＲＥＬＩＥＦＨＯＬＥＳ①ＤｉｎｇＤｅｘｉｎＣｅｎｔｒａｌＳｏｕｔｈＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｈｅｎｇｙａｎｇ４２１００１ＡＢＳＴＲＡＣＴＡｃａｓｅｓｔｕ...     

A NEW ORTHOTROPIC YIELD FUNCTION DESCRIBABLE ANOMALOUS BEHAVIOR OF MATERIALS

ＡＮＥＷＯＲＴＨＯＴＲＯＰＩＣＹＩＥＬＤＦＵＮＣＴＩＯＮＤＥＳＣＲＩＢＡＢＬＥＡＮＯＭＡＬＯＵＳＢＥＨＡＶＩＯＲＯＦＭＡＴＥＲＩＡＬＳＡＮＥＷＯＲＴＨＯＴＲＯＰＩＣＹＩＥＬＤＦＵＮＣＴＩＯＮＤＥＳＣＲＩＢＡＢＬＥＡＮＯＭＡＬＯＵＳＢＥＨＡＶＩＯＲＯＦ...     

汽车半轴套管用无缝钢管

汽车半轴套管用无缝钢管黄公健（鞍钢无缝钢管厂）ＳＥＡＭＬＥＳＳＳＴＥＥＬＴＵＢＥＦＯＲＭＡＮＵＦＡＣＴＵＲＥＯＦＡＵＴＯＭＯＢＩＬＥＨＡＬＦＳＨＡＦＴＳＬＥＥＶＥ￥ＨｕａｎｇＧｏｎｇｊｉａｎ（ＳｅａｍｌｅｓｓＳｔｅｅｌＴｕｂｅＰｌａｎｔ，Ａｎｓｈａｎ...     

REDUCTIVE LEACHING OF MANGANESE NODULE BY CHALCOPYRITE INDILUTE HCL SOLUTION

ＲＥＤＵＣＴＩＶＥＬＥＡＣＨＩＮＧＯＦＭＡＮＧＡＮＥＳＥＮＯＤＵＬＥＢＹＣＨＡＬＣＯＰＹＲＩＴＥＩＮＤＩＬＵＴＥＨＣＬＳＯＬＵＴＩＯＮＧｕｏ；Ｘｕｅｙｉ（ＤｅｐａｒｔｍｅｎｔｏｆＮｏｎｆｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉ...     

FLOTATION MECHANISM OF FLUORITE AND HEMATITE WITH SODIUM NAPHTHENE SULFONATE

ＦＬＯＴＡＴＩＯＮＭＥＣＨＡＮＩＳＭＯＦＦＬＵＯＲＩＴＥＡＮＤＨＥＭＡＴＩＴＥＷＩＴＨＳＯＤＩＵＭＮＡＰＨＴＨＥＮＥＳＵＬＦＯＮＡＴＥ￥Ｇｅ，Ｙｉｎｇｙｏｎｇ；Ｑｕｅ，Ｘｕａｎｌａｎ（ＣｈａｎｇｓｈａＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＭｉｎｉｎｇ...     

不锈钢／Al固液轧制复合板材界面的精细结构

应用场发射透射电子显微镜研究了不锈钢／Ａｌ固液轧制复合板材界面的精细结构。结果表明,在钢－Ａｌ之间存在主要由两种金属间化合物组成的界面反应层。靠近钢处由一层细小的（Ｆｅ,Ｃｒ,Ｎｉ）２Ａｌ５纳米晶组成,靠近Ａｌ处由纳米级的（Ｆｅ,Ｃｒ,Ｎｉ）４Ａｌ１３柱状晶组成。反应层附近的Ａｌ中有各种形态的（Ｆｅ,Ｃｒ,Ｎｉ）４Ａｌ１３相析出,并对界面结构的形成进行了初步的分析。     

MORPHOLOGY OF MELT SPINNING SUPERSATURATED B2 NiAl

ＭＯＲＰＨＯＬＯＧＹＯＦＭＥＬＴＳＰＩＮＮＩＮＧＳＵＰＥＲＳＡＴＵＲＡＴＥＤＢ２ＮｉＡｌ￥ＳＵＮＢａｏｄｅ;ＣＨＥＸｉａｏｚｈｏｕ;ＬＩＮＤｏｎｇｌｉａｎｇ;ＺＨＯＵＹａｏｈｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＥｎｇｉｎｅｅｒｉｎｇ,Ｓｈａ...     

Anelastic effects connected with isothermal martensitic transformations in 24Ni4Mo austenitic and 12Cr9Ni4Mo maraging steels

Anelasticity of the austenitic steel 24Ni5Mo and the stainless steel 12Cr9Ni4Mo has been investigated in the austenitic state after quenching with respect to isothermal martensitic transformation during cooling and subsequent heating. Maxima of anelasticity due to isothermal transformation at ≈200 K (24Ni5Mo, 0.002% C) and ≈250 K (12Cr9Ni4Mo; 0.01% C) coincided well with C-curve noses obtained by methods based on magnetic properties and electric resistivity. Corresponding internal friction maxima were found to be dependent on cooling or heating rate, quenching temperature and the frequency of oscillation and may therefore be described using the Delorme approximation. The activation energy of isothermal martensitic transformation calculated from the lower part of the C-curves estimated using the Borgenstam–Hillert and Arrhenius methods (3–8 kJ/mol for 24Ni5Mo and 15–20 kJ/mol for 12Cr9Ni4Mo) are comparable with the energy of impurity–dislocation interaction (≈10 kJ/mol) and interpreted as too low to be caused by diffusion processes: the activation energy for carbon diffusion in austenitic steel 24Ni5Mo is found to be ≈135 kJ/mol and ≈145 kJ/mol for austenite in two-phase 12Cr9Ni4Mo steel. An estimation showed that the activation energy for the isothermal martensitic transformation for the 24Ni5Mo alloy with so-called binary martensitic kinetics was higher in the vicinity of the nose of the C-curve, became lower with a decrease in temperature range and approached zero in the vicinity of the athermal martensitic point. A similar effect was not observed in the 12Cr9Ni4Mo steel.     

Fe-Ni-Cr合金镀层耐蚀性能研究

研究了DMF－Glycine水溶体系电沉积Fe-Ni-Cr合金镀层耐蚀性能,结果表明：合金镀层耐蚀性能随合金镀层中铬含量的增加而提高,含铬量为27％的合金镀层与18－8不锈钢蚀性能相近,合金镀层经热处理印化后耐腐蚀性能增强。     

High-Power Diode Laser-Treated 13Cr4Ni Stainless Steel for Hydro Turbines

The cast martensitic chromium nickel stainless steels such as 13Cr4Ni, 16Cr5Ni, and 17Cr4Ni PH have found wide application in hydro turbines. These steels have adequate corrosion resistance with good mechanical properties because of chromium content of more than 12%. The 13Cr4Ni stainless steel is most widely used among these steels; however, lacks silt, cavitation, and water impingement erosion resistances (SER, CER, and WIER). This article deals with characterizing 13Cr4Ni stainless steel for silt, cavitation, and water impingement erosion; and studying its improved SER, CER, and WIER behavior after high-power diode laser (HPDL) surface treatment. The WIER and CER have improved significantly after laser treatment, whereas there is a marginal improvement in SER. The main reason for improved WIER and CER is due to its increased surface hardness and formation of fine-grained microstructure after HPDL surface treatment. CER and WIER of HPDL-treated 13Cr4Ni stainless steel samples have been evaluated as per ASTM G32-2003 and ASTM G73-1978, respectively; and these were correlated with microstructure and mechanical properties such as ultimate tensile strength, modified ultimate resilience, and microhardness. The erosion damage mechanism, compared on the basis of scanning electron micrographs and mechanical properties, is discussed and reported in this article.     

321不锈钢钝化膜孔蚀破坏的原子吸收光谱研究

采用原子吸收光谱方法测定不锈钢局部破坏后各种元素的析出量，研究了３２１不锈钢在ＮａＣｌ水不溶液中钝化膜孔蚀破坏的特征。研究结果表明：ＡＡＳ可有效地用于不锈钢孔蚀动力学的研究。     

哌啶缓蚀作用的原子吸收光谱研究——Ⅰ.304不锈钢、工业纯铁、铬、镍在盐酸中的腐蚀行为及哌啶的缓蚀作用

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。     

0Cr16Ni5Mo1马氏体不锈钢的连续冷却相变动力学

采用显微组织表征和硬度测试研究了0Cr16Ni5Mo1马氏体不锈钢连续冷却转变动力学和显微组织演化规律。结果表明:0Cr16Ni5Mo1马氏体不锈钢在1100 ℃×60 min奥氏体化条件下,以0.5~100 ℃/s的速度冷却时仅发生马氏体转变,马氏体相变的开始温度(Ms)约为212 ℃,结束温度(Mf)约为25.3 ℃,组织均为板条马氏体,硬度约为371 HV。冷却速率的变化对相变温度、室温组织和硬度无显著影响。采用K-M方程描述马氏体相变过程,其相变动力学参数α约为0.0317。     

Relationship Between Microstructure and Corrosion Behavior of Cr12Ni3Co12Mo4W Ultra-High-Strength Martensitic Stainless Steel

The effect of tempering temperature on the microstructure and corrosion behavior of Cr12Ni3Co12Mo4W ultra-high-strength martensitic stainless steel was investigated using transmission electron microscopy, atomic force microscopy, X-ray diffraction, and electrochemical tests. The microstructures of the ultra-high-strength martensitic stainless steel consisted of some retained austenite and lath/plant martensite with the carbides distributed within the matrix and at the grain boundaries. Tempering of the steel for 4 h at various temperatures resulted in various carbide grain sizes and different amounts of the retained austenite. The results showed that larger carbide grains led to diminished corrosion resistance, whereas larger amounts of the retained austenite resulted in improved corrosion resistance. The steels exhibited good corrosion resistance in 0.017 mol/L NaCl solution and exhibited pitting corrosion in 0.17 mol/L Na Cl solution. The martensite and prior austenite crystal boundaries dissolved in solution with pH 1.