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Formation of carbonitride precipitates in hardfacing alloy with niobium addition

Rare Metals 2013年第1期32卷 52-56页

作者： Ke Yang Qin Yang Ye-Feng Bao College of Mechanical and Electrical Engineering Hohai University

Niobium, as the most effective second-phase forming element, was added in the Fe-Crl3-C-N hard- facing alloy to get carbonitride precipitates. Morphology and composition of carbonitride in the hardfacing alloy were studied by optical microscopy, scanning electron microscopy, and electron probe microanalyzer. The ther- modynamics and the effect on the matrix of the formation of carbonitride were also discussed. It was found that niobium carbonitrides are complex Nb（C, N） precipitate distributed on grain boundary and matrix of the hardfacing alloy. Under as-welded condition, primary carbonitride particles were readily precipitated from the hardfacing alloy with large size and morphology as they were formed already during solidification. Under heat treatment condi- tion, a large number of secondary carbonitrides can pre- cipitate out with very fine size and make a great secondary hardening effect on the matrix. As a result, addition of niobium in the hardfacing alloy can prevent the formation of chromium-rich phase on grain boundaries and inter- granular chromium depletion.

关键词： Niobium Carbonitride hardfacing alloy Precipitate

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Formation mechanism of titanium and niobium carbides in hardfacing alloy

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Rare Metals 2017年第8期36卷 640-644页

作者： Ke Yang KèYang Ye-Feng Bao Yong-Feng Jiang College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022China

The most effective carbide-forming elements titanium and niobium were added into hardfacing *** and composition of carbides in the hardfacing alloy were investigated by means of optical microscope（OM）,scanning electron microscope（SEM）,X-ray diffraction（XRD）and energy-dispersive spectrometer（EDS）.Hardness and impact toughness of the hardfacing alloy were *** thermodynamics and formation mechanism of carbides were also *** is found that the carbides consist of TiC and NbC which are able to form directly from welding pool during the welding *** formation mechanism of carbides involves nucleation of TiC followed by epitaxial precipitation of NbC on the surface of *** formation of titanium and niobium carbides can obviously refine the microstructure and deplete the carbon in the *** micros tructure transforms to well-distributed carbides and a tough martensite matrix,contributing to a good combination of high hardness and high toughness in the hardfacing alloy.

关键词： Titanium Niobium hardfacing alloy Carbides Microstructure

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Microstructure and wear property of hardfacing alloy with nitrogen strengthening

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China Welding 2009年第3期18卷 51-54页

作者：杨可余圣甫邓宇李文婷周强徐慧子 College of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074

The nitrogen-alloying hardfacing alloy of the martensitic stainless steel was deposited on a low carbon steel substrate using hardfacing flux-cored wire. Microstructure and surface hardness of hardfacing alloy were investigated and measured by optical microscope and microhardness tester. Carbonitrides of the hardfacing alloy were observed by electron probe. The wear behaviour of the hardfacing alloy was studied using the belt abrasion test apparatus and the worn surface was analyzed by scanning electron microscopy. The results showed that carbonitride particles in the hardfacing alloy are complex MX （ M： alloy elements ; X： C, N） precipitate with fine size. These carbonitride particles distributed homogeneously in the hardfacing alloy and had a good strengthening effect on the wear property. The wear property of the hardfacing alloy with nitrogen was better than the one without nitrogen.

关键词： microstructure wear property carbonitride hardfacing alloy

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Study of carbonitride precipitates in the Fe-Cr-Mn-N hardfacing alloy

Study of carbonitride precipitates in the Fe-Cr-Mn-N hardfac...

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第六届材料与热加工物理模拟及数值模拟国际会议

作者： Yang Ke Xie Xiang Bao Yefeng Jiang Yongfeng College of Mechanical and Electrical Engineering Hohai University Changzhou 213022 China

The Fe-Cr-Mn-N hardfacing alloy was deposited on a low carbon steel substrate by the weld hardfacing *** and Nb as the most effective nitrogen-fixing elements were added in the hardfacing *** precipitates were systematically studied by canning electron microscopy and electron probe *** thermodynamics and the effect on the matrix of the formation of carbonitride were also *** was found that carbonitride precipitates were complex carbonitride of Ti and Nb distributing on grain boundary and matrix of the hardfacing *** as-welded condition,primary carbonitride particles were readily precipitated from the hardfacing alloy with large size and morphology as they were formed already during *** heat-treated condition,a large number of secondary carbonitrides can precipitate-out with very fine size and make a great secondary hardening effect on the *** a result,precipitation of carbonitride in the hardfacing alloy can prevent the formation of chromium-rich phase on grain boundaries and increase the wear resistance of the hardfacing alloy.

关键词： carbonitride precipitate hardfacing alloy deposit thermodynamics.

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Effect of molybdenum on the microstructure and wear resistance of hypoeutectic Fe-Cr-B-C hardfacing alloys

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China Welding 2018年第4期27卷 46-51页

作者： Wang Shenglin Cui Li He Dingyong Liu Hao Wang Xu Han's Laser Technology Industry Group Co. Ltd College of Materials Science and Engineering Beijing University of Technology

Hypoeutectic Fe-Cr-B-C hardfacing alloys with different molybdenum( Mo) contents( The design content was 0,2,3. 3 and 4. 5 wt. %,respectively) were deposited using the flux-cored wire by means of metal active gas arc welding. The effects of Mo on the refinement of microstructures,eutectic microstructure changes and improvement of wear resistance were investigated. The main results were shown as follows: the added Mo could increase the volume fraction of eutectic microstructure and reduce the size of coarse primary austenite as well as the volume fraction. The carboboride of M3( B,C) could be observed in hypoeutectic Fe-Cr-B-C hardfacing alloys at the Mo design content of ≤2. 0 wt. %,while that of M23( B,C)6was formed when 3. 3 wt. % Mo was ***,the wear resistance of alloys was increased with the increase in Mo content. Specifically,the highest wear resistance of alloys was achieved at 4. 5 wt. % Mo design content,which was 113. 7% higher than that in alloys without Mo.

关键词： hypoeutectic hardfacing alloy microstructure wear resistance molybdenum

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