EFFECT OF PROGRESSIVE AGING TREATMENT ON THE PROPERTIES AND MICROSTRUCTUR

ＥＦＦＥＣＴＯＦＰＲＯＧＲＥＳＳＩＶＥＡＧＩＮＧＴＲＥＡＴＭＥＮＴＯＮＯＮＴＨＥＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＦＴＨＥＨＩＧＨ－ＨＡＲＤＥＬＡＳＴＩＣＮＩＣＫＥＬ－ＣＨＲＯＭＩＵＭ－ＡＬＵＭＩＮＩＵＭＡＬＬＯＹ￥ＬＩＵＧｕｉ...     

PROGRESS IN STUDIES OF ELECTROCATALYSTS AND DOPED CARBON ANODES IN ALUMINIUM ELECTROLYSIS CELLS

ＰＲＯＧＲＥＳＳＩＮＳＴＵＤＩＥＳＯＦＥＬＥＣＴＲＯＣＡＴＡＬＹＳＴＳＡＮＤＤＯＰＥＤＣＡＲＢＯＮＡＮＯＤＥＳＩＮＡＬＵＭＩＮＩＵＭＥＬＥＣＴＲＯＬＹＳＩＳＣＥＬＬＳＰＲＯＧＲＥＳＳＩＮＳＴＵＤＩＥＳＯＦＥＬＥＣＴＲＯＣＡＴＡＬＹＳＴＳＡＮＤＤＯＰＥ...     

INVESTIGATION ON THIN－WALL EFFECT OF A DIRECTIONALLY SOLIDIFIED SUPERALLOY BY USING TUBULAR SPECIMENS

ＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＴＨＩＮ－ＷＡＬＬＥＦＦＥＣＴＯＦＡＤＩＲＥＣＴＩＯＮＡＬＬＹＳＯＬＩＤＩＦＩＥＤＳＵＰＥＲＡＬＬＯＹＢＹＵＳＩＮＧＴＵＢＵＬＡＲＳＰＥＣＩＭＥＮＳＲ．Ｚ．ＣｈｅｎａｎｄＨ．Ｗ．Ｚｈａｎｇ（ＢｅｉｊｉｎｇＩｎｓｔｉｔｕｔ...     

DEVELOPMENT OF BRAIDED－PULTRUSION PROCESS AND STRUCTURE－PROPERTY RELATIONSHIPS FOR TUBULAR COMPOSITES

ＤＥＶＥＬＯＰＭＥＮＴＯＦＢＲＡＩＤＥＤ－ＰＵＬＴＲＵＳＩＯＮＰＲＯＣＥＳＳＡＮＤＳＴＲＵＣＴＵＲＥ－ＰＲＯＰＥＲＴＹＲＥＬＡＴＩＯＮＳＨＩＰＳＦＯＲＴＵＢＵＬＡＲＣＯＭＰＯＳＩＴＥＳＪ．Ｈ．Ｂｙｕｎ;Ｓ．－Ｋ．ＬｅｅａｎｄＢ．Ｓ．Ｋｉｍ（Ｋｏｒｅａ...     

INVESTIGATIONS ON THE FORMATION OF INITIAL CRACKS IN THERMAL BARRIER COATINGS PREPARED BY EB－PVD

ＩＮＶＥＳＴＩＧＡＴＩＯＮＳＯＮＴＨＥＦＯＲＭＡＴＩＯＮＯＦＩＮＩＴＩＡＬＣＲＡＣＫＳＩＮＴＨＥＲＭＡＬＢＡＲＲＩＥＲＣＯＡＴＩＮＧＳＰＲＥＰＡＲＥＤＢＹＥＢ－ＰＶＤＳ．Ｋ．Ｇｏｎｇ;Ｌ．Ｄｅｎｇ;Ｆ．Ｓ．ＬｉｕａｎｄＨ．Ｂ．Ｘｕ（Ｄｅｐａｒｔｍｅｎ...     

DIFFUSION PHENOMENA AND MICROSTRUCTURE STABILITY OF Ni－Cr－Al－Y－Si COATING ON THENi_3Al BASED ALLOY SUBSTRATE

ＤＩＦＦＵＳＩＯＮＰＨＥＮＯＭＥＮＡＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＴＡＢＩＬＩＴＹＯＦＮｉ－Ｃｒ－Ａｌ－Ｙ－ＳｉＣＯＡＴＩＮＧＯＮＴＨＥＮｉ_３ＡｌＢＡＳＥＤＡＬＬＯＹＳＵＢＳＴＲＡＴＥＺ．Ｐ．Ｘｉｎｇ;Ｙ．Ｆ．Ｈａｎ;Ｙ．Ｌ．ＪｉａｎｄＭ．Ｇ?..     

INFORMATION DESIGN OF UNIVERSAL ADJUSTMENT PROGRAM OF PLANE CONTROL NETWORKS

ＩＮＦＯＲＭＡＴＩＯＮＤＥＳＩＧＮＯＦＵＮＩＶＥＲＳＡＬＡＤＪＵＳＴＭＥＮＴＰＲＯＧＲＡＭＯＦＰＬＡＮＥＣＯＮＴＲＯＬＮＥＴＷＯＲＫＳＩＮＦＯＲＭＡＴＩＯＮＤＥＳＩＧＮＯＦＵＮＩＶＥＲＳＡＬＡＤＪＵＳＴＭＥＮＴＰＲＯＧＲＡＭＯＦＰＬＡＮＥＣＯＮＴＲＯ...     

PHASES AND STRUCTURE OF PREFORM DURING PREPARING PROCESS OF Al／TiCp COMPOSITES BY DIRECT REACTION SYNTHESIS

ＰＨＡＳＥＳＡＮＤＳＴＲＵＣＴＵＲＥＯＦＰＲＥＦＯＲＭＤＵＲＩＮＧＰＲＥＰＡＲＩＮＧＰＲＯＣＥＳＳＯＦＡｌ／ＴｉＣｐＣＯＭＰＯＳＩＴＥＳＢＹＤＩＲＥＣＴＲＥＡＣＴＩＯＮＳＹＮＴＨＥＳＩＳＳ．ＹＺｅｎｇ;Ｂ．ＹａｎｇａｎｄＥ．Ｌ．Ｚｈａｎｇ（Ｈａｒｂｉ...     

STABILITY OF WHISKERS AND INTERFACIAL MICROSTRUCTURE IN ALUMINUM MATRIX COMPOSITES REINFORCED BY K_2O·8TiO_2 WHISKERS

ＳＴＡＢＩＬＩＴＹＯＦＷＨＩＳＫＥＲＳＡＮＤＩＮＴＥＲＦＡＣＩＡＬＭＩＣＲＯＳＴＲＵＣＴＵＲＥＩＮＡＬＵＭＩＮＵＭＭＡＴＲＩＸＣＯＭＰＯＳＩＴＥＳＲＥＩＮＦＯＲＣＥＤＢＹＫ_２Ｏ·８ＴｉＯ_２ＷＨＩＳＫＥＲＳ￥ＬＩＪｉｈｏｎｇ;ＮＩＮＧＸｉａｏｇｕａｎ...     

EFFECTS OF TEMPERATURE ON DISTRIBUTION BEHAVIORS OF MINOR ELEMENTS IN COPPER FLASH SMELTING──COMPUTER SIMULATION

ＥＦＦＥＣＴＳＯＦＴＥＭＰＥＲＡＴＵＲＥＯＮＤＩＳＴＲＩＢＵＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＭＩＮＯＲＥＬＥＭＥＮＴＳＩＮＣＯＰＰＥＲＦＬＡＳＨＳＭＥＬＴＩＮＧ──ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮ￥ＴａｎＰｅｎｇｆｕ；ＺｈａｎｇＣｈｕａｎｆｕ（Ｄｅ...     

KINETICS OF TEMPER EMBRITTLEMENT IN 2.25Cr-1Mo STEEL USED FOR HOT-WALL HYDROFINING REACTORS

Based on the theory of grain boundary segregation, a kinetics model of temper em-brittlement caused by long-term service for hot-wall hydrofining reactors was studied.The kinetics model was applied to phosphorus (P) segregation in 2.25Cr-1Mo steelused for a hot-wall hydrofining reactor, and the kinetics of grain boundary segrea-tion of impurity P in the steel exposed to the process environment of the hydrofiningreactor was calculated on the basis of the model. The Auger electron spectroscopytest was performed in order to determine the grain boundary concentration of P. Theexperimental result is agreement with the theoretical calculated data. The results showthat the kinetics equation is reasonable for predicting the levels of grain boundarysegregation of impurity P in 2.25Cr-1Mo steel used for hot-wall hydrofining reactors.     

KINETICS OF TEMPER EMBRITTLEMENT IN 2.25Cr-lMo STEEL USED FOR HOT-WALL HYDROFINING REACTORS

Based on the theory of grain boundary segregation,a kinetics model of temper embrittlement caused by long-term service for hot-wall hydrofining reactors was studied.The kinetics model was applied to phosphorus (P) segregation in 2.25Cr-1Mo steel used for a hot-wall hydrofining reactor,and the kinetics of grain boundary segregation of impurity P in the steel exposed to the process environment of the hydrofining reactor was calculated on the basis of the model.The Auger electron spectroscopy test was performed in order to determine the grain boundary concentration of P.The experimental result is agreement with the theoretical calculated data. The results show that the kinetics equation is reasonable for predicting the levels of grain boundary segregation of impurity P in 2.25Cr-1Mo steel used for hot-wall hydrofining reactors.     

INFLUENCE OF AUSTENITIZING TEMPERATURE ON IMPURITY SEGREGATION ALONG GRAIN BOUNDARIES IN STEEL 4330M

The effect of austenitizing temperature on segregation of impurities along grain boundaries in steel 4330M has been examined by AES.The impurity segregation was computed quantitatively.Results showed that the quantity of impurity segregation changed with the austenitizing temperature.The limitation of the McLean′s expression for equilibrium segrega- tion was discussed.     

水平连铸带坯QSn6.5-0.1的组织与性能

讨论了锡磷青铜QSn6.5-0.1水平连铸带坯的宏观组织特点、反偏析行为和显微缩孔。结果表明：横断面以柱状晶为主，结晶中心线普遍上移，大面出现结晶角，上下表面和侧边出现反偏析，紧临偏析区出现低Sn区，显微缩松是主要组织缺陷．是冷加工报废的主要原因，同时通过热处理试验，分析了热处理规范对锭坯性能及组织的影响，并制订出合理的热处理规范。     

Intergranular fracture on fatigue fracture surface of 2.25Cr-1Mo steel at room temperature in air

Low-alloy steels serving for a long time at high temperature (∼500 °C) are very sensitive to temper embrittlement due to segregation of various trace elements at prior austenite grain boundaries and/or carbide/matrix interfaces. This type of segregation in combination with various environmental effects can adversely affect the fracture resistance and fatigue crack propagation rate with subsequent change in the fracture morphology of low-alloy steels. The present work describes the effects of heat treatments on impurity element segregation and its subsequent effects on fatigue fracture behavior of 2.25Cr-1Mo steel under different environmental conditions and temperatures. It has been found that either prior impurity element segregation caused during the heat treatment or hydrogen-induced embrittlement due to the presence of water vapor in laboratory air alone cannot produce intergranular fracture on the fatigue surfaces of 2.25Cr-1Mo steel at room temperature in air. The occurrence of intergranular fracture on the fatigue surfaces results from the combined effect of impurity element segregation-induced grain boundary embrittlement and hydrogen-induced embrittlement, and that the proportion of intergranular fracture is a function of prior impurity element segregation provided that the grain boundary segregation level exceeds a certain critical value.     

磷元素的非平衡晶界偏聚对A690M海洋环境用钢耐海水腐蚀性能的影响

采用俄歇能谱分析了A690M海洋环境用钢在600℃回火过程中磷元素的晶界偏聚行为,结合极化曲线和腐蚀锈层的微观分析探讨了P元素晶界偏聚对A690M钢耐海水腐蚀性能的影响。研究表明:A690M钢中P元素的晶界偏聚符合空位-溶质原子复合扩散导致的非平衡偏聚机制;P的晶界偏聚含量越高,锈层内部越易形成层状磷疤坑,使板坯耐海水腐蚀性能降低。     

CSP低碳钢的晶粒细化与强韧化

生产统计表明：成分与Q195接近的CSP工艺低碳钢ZJ330其屈服强度成倍提高，可达到310－410MPa，同时延伸率达到30％－45％。本文对CSP工艺生产的低碳钢以及同一块钢坯经不同阶段轧制冷却后的试样进行了研究。应用TEM＋XEDS技术在薄晶体和萃取复型试样中观察到沿晶界和亚晶界析出的许多细小氧化物和硫化物粒子。研究表明：纳米级氧化物与硫化物沉淀粒子可阻碍晶粒长大，而微量杂质元素在晶界 偏聚可以通过阻碍晶界迁移和降低γ-α转变温度而起到细化晶粒的作用，由沉淀和偏聚导致的有效晶粒尺寸减小是这类钢板强度与塑性同时大幅提高的重要原因之一。     

抗硫酸露点腐蚀钢的表面研究

以高硫重油为燃料的锅炉烟气中常含有较多的ＳＯ２、ＳＯ３在锅炉的低温部位，如空气预热器、集尘器、烟道、烟囱等处引起所谓的“硫酸露点腐蚀”。日本开发的各种Ｓ－ＴＥＮ烟具有良好的抗硫酸露点腐蚀性能。在成分上，Ｓ－ＴＥＮ钢与普通碳钢不同的是：它含有少量的Ｃｕ、Ｓｂ元素，但这些合金元素提高抗硫酸露点腐蚀的机理仍不清楚。本工作对供货状态的、以及在硫酸中浸泡过的Ｓ－ＴＥＮ钢进行ＡＥＳ分析和ＳＥＭ观察及能谱分析，     

稀土对钢轨钢界面杂质偏聚的抑制作用

利用俄歇能谱(AES)分析技术,对钢轨钢的界面(解理面、晶界面)进行成分分析。实验结果表明,钢轨钢中加入稀土元素后,界面上的P、S原子偏聚基本消失,使界面得到明显的净化。     

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高强度23MnNiMoCr54链环钢是煤矿设备主要部件,在进行生产测试过程中发生断裂。对该链条钢裂纹部位进行了金相检测、化学元素成分检测、扫描电镜和断口检验和俄歇电子能谱仪分析。结果表明,链条钢的化学元素组成、气体含量、低倍组织和夹杂物含量符合相关技术标准要求;其金相组织为回火屈氏体,实际晶粒度为4级,断口为典型的脆性断口,断裂方式为沿晶脆性断裂。由于链环在生产过程中热处理不当,淬火加热温度过高,产生过热组织,造成链环晶粒粗大,在随后的回火过程中由于加热温度或者加热时间不当,导致晶界处杂质元素偏析,从而形成回火脆性。在晶粒粗大的情况下同时出现回火脆性,导致了链环钢在试验检查时发生沿晶脆性断裂。