材料期刊网

Finite Element Numerical Simulation of Temperature Field in Metal Pattern Casting System and “Reverse Method”of Defining the Thermal Physical

L. Chen , P.L. Wang , P.N. Song , J.Y. Zhang , null , null , null , null , null , null , null , null , null , null , null , null , null

金属学报(英文版)

With the technology support of virtual reality and ANSYS software, an example on the simulation of temperature distribution of casting system during the solidification process was provided, which took the latent heat of phase change, the conditions for convection, and the interface heat transfer coefficient into consideration. The result of ANSYS was found to agree well with the test data. This research offers an unorthodox way or“Reverse Method” of defining the relevant thermal physical coefficient.

关键词: solidification process , null , null

Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

P510L钒微合金化钢的CCT曲线及其显微组织

刘健 , 张开坚 , 陆建生 , 左军 , 杨峰 , 孙建阁

上海金属 doi:10.3969/j.issn.1001-7208.2009.01.005

通过测定P510L钢在不同冷速下的连续冷却转变的膨胀曲线,获得了该钢的CCT曲线;研究了P510L钢连续冷却过程中奥氏体的转变过程及转变产物的组织形态和显微组织,通过对CCT曲线的分析为控轧控冷工艺提供理论依据.

关键词: P510L钢 , CCT曲线 , 显微组织 , 显微硬度

FeMoB Enhanced Sintering of P/M 316L Stainless Steel

YANG Xia , GUO Shiju

钢铁研究学报(英文版)

Liquidphase enhanced sintering of powder metallurgy (P/M) 316L stainless steel by addition of sintering aids was studied. 2%-8% of prealloyed FeMoB powder with two different particle sizes was added as sintering aids, and the specimens were sintered in vacuum at 1 200-1 350 ℃. The results show that the fine FeMoB powder (5-10 μm) has stronger activated effect. The sintered density increases with the increase in sintering aid content or sintering temperature. Warm compaction has a better effect on the control of dimensional precision of compacts. The prealloyed FeMoB powder deviated from Mo2FeB2 component can also be sintering aid of P/M 316L stainless steel.

关键词: P/M 316L stainless steel;liquidphase sintering;activated sintering;FeMoB;sintering aid

P510L钒微合金化钢连续冷却转变特征

余万华 , 周李泉 , 韩静涛 , 张中平 , 刘勇 , 佘广夫

钢铁钒钛 doi:10.3969/j.issn.1004-7638.2006.03.011

采用膨胀法测定了攀枝花新钢钒热轧板厂的高强度P510L钒微合金化钢的CCT曲线,采用金相显微镜分析不同冷速下的显微组织.分析发现,冷却速度较慢(低于10℃/s)时,得到的显微组织为比较粗大的铁素体+珠光体组织;中速冷却时,组织为比较细小均匀的铁素体+珠光体组织;快冷时(高于35℃/s)主要为贝氏体和铁素体组织.进一步采用扫描电镜分析P510L显微组织,发现大量钒的析出物,V(CN)析出物的形态为从球形至长方形,其大小为10～30 nm.

关键词: 微合金钢 , 热轧 , 显微组织 , CCT曲线

腐蚀介质温度对316L/Ni-P镀层腐蚀及电化学行为影响

方信贤 , 巴志新 , 甄睿 , 王章忠

材料热处理学报

采用质量损失法研究了化学镀Ni-P镀层及对比材料316L在单相流(20％ H2SO4)和两相流(20％ H2SO4+ 20 g/L黄砂)中冲刷腐蚀行为,以及电化学方法研究了介质温度对Ni-P镀层及316L电化学行为的影响.结果表明,介质温度升高(20 ～80℃),Ni-P镀层腐蚀速率、冲刷腐蚀速率和冲刷腐蚀交互作用增大,但与316L和300℃热处理的晶态镍磷镀层相比,介质温度对镀态和200 ℃热处理的非晶镍磷镀层影响较小.镀态镍磷和316L的腐蚀电流密度随介质温度升高而增大,容抗弧半径则随介质温度升高而减小.Ni-P镀层腐蚀和单相流冲刷腐蚀机制是均匀腐蚀,而两相流中则为均匀腐蚀+犁削机制.

关键词: Ni-P镀层 , 316L , 腐蚀 , 冲刷腐蚀 , 阻抗谱

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

304L不锈钢表面激光熔覆Fe-Cr-Si-P非晶涂层

王彦芳 , 鲁青龙 , 肖丽君 , 石志强

稀有金属材料与工程

采用激光熔覆技术在304L不锈钢基体表面制备了Fe-Cr-Si-P非晶复合涂层.利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电化学测试系统和摩擦磨损试验机等分析了涂层的组织结构、相组成、耐蚀及耐磨等性能.研究结果表明,激光熔覆层组织主要由表层“梅花”形树枝晶区,中心非晶区和树枝晶结合区组成,熔覆层与基体呈现良好的冶金结合.熔覆层中除了非晶相外,还有少量Fe3P和Fe2Si等金属间化合物相.涂层的硬度HV0.2约为8000 MPa,是基体硬度的4倍；腐蚀电位Ecorr和自腐蚀电流密度icorr分别为-449.3 mV和-4.34 μA/cm2;在100 N载荷下摩擦系数仅为0.076,具有较好的综合性能.

关键词: 激光熔覆 , 非晶涂层 , Fe-Cr-Si-P , 组织 , 性能

Ni-P化学镀层对304L钢焊接接头的应力腐蚀的影响

关凯书 , 王晓燕 , 王志文

中国腐蚀与防护学报

用慢应变速率（SSRT）和恒载荷应力腐蚀试验方法研究了Ni-P化学镀层对304L钢焊接接头在42%MgCl2溶液和5%HCl溶液中的应力腐蚀（SCC）的影响，并对镀层的最佳磷含量进行了研究。在较低的应力下，特别是在镀层不开裂的情况下，镀层能起到抗SCC的作用；而当应力较高（σ＞σs）时或在SSRT下镀层破裂时，则裂纹首先在镀层破裂处产生，从而镀层失去保护作用。

关键词: Ni-P , stress corrosion , 304L steel , welding joint , null

316L不锈钢Ni-W-P非晶态化学镀层的耐腐蚀性能

郑志军 , 赵可昕 , 高岩

材料保护

为了弄清316L不锈钢Ni-W-P非晶态化学镀层的耐腐蚀性能,以模拟人工汗液和5.0%H2SO4溶液为腐蚀介质进行了阳极极化试验.结果发现,镀层厚度超过10μm时:(1)Ni-W-P非晶态化学镀层的耐蚀性能与316L不锈钢基本相当;(2)在前48时,Ni-W-P非晶态化学镀层耐汗液的抗变色能力也与316L不锈钢相近,但随着浸泡时间的延长,抗变色能力较316L不锈钢差.

关键词: 化学镀 , Ni-W-P非晶态镀层 , 不锈钢 , 耐腐蚀性能