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EFFECT OF LASER SCANNING SPEED ON PHASE CONSTITUTION AND WEAR RESISTANCE OF LASER CLADDING HARD FACING ALLOY STELLITE 12

XU Yourong ZHANG Henghua CHEN Darning XIE Fuchun XU Mingyu Shanghai University of Science and Technology , Shanghai , ChinaCHEN Lanying SU Baorong QIAN Hongbin Shanghai Optics and Fine Mechinery Research Institute , Academia Sinica , Shanghai , China XU Yourong , professor , Department of Materials Science and Engineering , Shanghai University of Science and Technology , Shanghai 201800 , China

金属学报(英文版)

Effect of laser scanning speed on phase constitution,microstructure,microhardness and wear resistance of laser-cladding hard facing alloy Stellite 12 has been investigated by means of a cross-flow-type CO_2 laser of 1.5 kW.The laser-cladding layer on the alloy consists of ma- trix phase of suppersaturated solid solution γ(Co,Cr)and complex hexagonal carbide M_7C_3.Under certain condition,at higher laser scanning speed,the suppersaturated solubility of elements increases in γ(Co,Cr),and the precipitation of the complex carbtde M_7C_3 de- creases,so the microhardness increases and the wear resistance decreases.But at slower laser scanning speed,more complex carbide M_7C_3 may precipitate,and the wear resistance may be improved.Therefore,it is believed that the principal factor in improving wear resistance is the precipitation of carbide M_7C_3,while increment of microhardness is the suppersaturated solu- bility of elements in matrix phase γ(Co,Cr).

关键词: laser-cladding , null , null , null

Ti对Zn-22Al-xTi钎料及Cu/Al钎焊接头性能的影响

姬峰 , 薛松柏 , 戴玮

稀有金属材料与工程

设计并采用Zn-Al-Ti系列钎料对Cu和Al异种金属实施了钎焊,并对Zn-22Al-xTi/Cu界面处的相组成和金属间化合物形貌进行了分析.结果表明:在Zn-22Al中添加0.01％至0.05％的Ti可以显著细化钎料组织,而且Zn-22Al-0.03Ti在Cu基板上的铺展面积比Zn-22Al高出60.4％,但Ti的添加会提高Zn-22Al钎料的熔点和熔化区间.另外,在钎料中添加微量的Ti可以优化Cu/Al接头中Cu侧界面化合物的组织并减小其厚度.相比Zn-22Al钎料,Zn-22Al-0.03Ti钎焊所得Cu/Al接头强度要高出13.4％,而且接头断裂位置由化合物层转移至钎料内部.X射线衍射结果显示,钎焊过程中有CuAl2,Cu9Al4,CuZn 3种化合物产生于钎料与Cu基板界面处.

关键词: Cu/Al异种金属 , Zn-Al-Ti钎料 , 钎焊 , 界面组织 , 相组成

热爆合成Ni-Al金属间化合物的物相及组织结构

崔洪芝 , 魏娜 , 赫庆坤 , 白斌

材料热处理学报

以Ni粉和Al粉为原料,通过热爆反应合成及空冷制备Ni-Al系金属间化合物.利用X射线衍射仪、电子探针和显微硬度计分析了合成试样的物相组成、显微组织及硬度.结果表明:当Ni、Al摩尔比为1∶1时,反应生成物为单一的枝晶状NiAl相；当Ni、Al摩尔比为3∶1时,生成物组织形态复杂,主要由枝晶状β-NiAl、粗大块状和网状γ-Ni3Al、不规则的块状或者短棒状γ'-Ni3Al、板条状和针片状M-NiAl组成.因为γ'-Ni3Al在β-NiAl晶粒内部析出造成的应力场、NiAl中富含大量Ni及非平衡冷却,有利于β-NiAl转变成M-NiAl.

关键词: NiAl , Ni3Al , 热爆合成 , 物相组成 , 组织结构

热等静压Cr3 C2/Ni3 Al复合材料的微观组织及相组成

傅丽华 , 韩伟 , 李长海 , 董超芳 , 赵琳 , 田志凌

钢铁研究学报 doi:10.13228/j.boyuan.issn1001-0963.20160171

采用热等静压技术(HIP)在1160℃、100 MPa 条件下制备出 Cr3 C2/Ni3 Al 复合材料,研究了 Cr3 C2/Ni3 Al复合材料的微观组织和相组成。结果表明,Cr3 C2初始颗粒首先溶解成 Cr 和 C 原子,并往基体中扩散；冷却过程中,溶解的Cr和C原子转化为稳定的Cr7 C3结构；由于 Ni3 Al合金中的 Fe易与 C形成稳定碳化物,促使Fe原子从基体中往Cr7 C3结构中发生上坡扩散,并取代Cr7 C3结构中的部分Cr原子形成 M7 C3(M为 Cr、Fe,余同)结构的扩散相。当Cr3 C2初始颗粒较大时,在高温过程中,Cr3 C2颗粒未能全部溶解,而未溶解的 Cr3 C2颗粒芯部在冷却过程中仍保持为Cr3 C2结构。该条件下制备的Cr3 C2/Ni3 Al复合材料主要由Cr3 C2硬芯相、M7 C3扩散相和γ′-Ni3 Al基材相组成,其中Cr3 C2硬芯相和γ′-Ni3 Al基材相通过M7 C3扩散相形成良好的扩散连接；该结构的复合材料磨损后表面Cr3 C2颗粒末发生剥落且沟槽在铬碳化物处发生中断,表现出良好的耐磨性。

关键词: 热等静压 , Cr3 C2/Ni3 Al复合材料 , 微观组织 , 相组成 , M7 C3

PHASE CONSTITUTION AND MORPHOLOGIES OF Mg-Zn-Zr ALLOY(MB15)

ZHANG Shaoqing Institute of Aeronautical Materials , Beijing , China ZHANG Shaoqing Institute of Aeronautical Materials , P.O.Box No.81 , Beijing 100095 , China

金属学报(英文版)

The equal-width lath-shaped Zn_2Zr_3 phase and the irregular lump MgZn_2 phase were ob- served in the Zr-and Zn-enriched nucleus region and along the grain boundaries of the as-cast alloy.The very fine ZnZr_2 phase occurs in the grains and the superfine MgZn phase disperses in the α-Mg solid solution.In extruded shapes,the coarse grains of Zn_2Zr_3 phase and a great many dispersively distributed ZrH_2 phase and MgZn_2 phase particles appear in the Zr-and Zn-enriched lath region.They play an important role in impeding the proceeding of recrystallization.The precipitation of Mg_2Zn_3 phase may be led to the non-lath region by ageing at 170℃ for 10h.

关键词: magnesium alloy , null , null

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