The Effect of Microstructure on Properties of Fe-Cr-C-Nb/Ti Hardfacing Alloy

2011 ◽  
Vol 279 ◽  
pp. 126-131 ◽  
Author(s):  
Wen Bo Tang ◽  
Yun Gang Guo ◽  
Hon Grui Wang
Keyword(s):  
Wear Resistance ◽  
Alloy System ◽  
Energy Dispersive Spectrum ◽  
High Wear Resistance ◽  
Low Carbon ◽  
Shielded Metal Arc Welding ◽  
Wear Resistant ◽  
Hardfacing Alloy ◽  
The Matrix ◽  
Carbon Martensite

Hardfacing is one of the most useful and economical ways to improve the performance of components submitted to severe wear conditions. In this paper, a new kind of alloy called Fe-Cr-C-Nb/Ti alloy system for wear resistant successfully with the shielded metal arc welding (SMAW) method has been studied. The microstructure and wear resistant of hardfacing alloys reinforced with primary carbides were compared in this study. Meanwhile, the average hardness, the abrasion weight loss and microstructure of deposited metal were systematically studied by optical microscopy, scanning electronic microscopy and energy dispersive spectrum analysis. The results showed that the microstructure of the best optimizing hardfacing layer was the mixed martensite and little retained austenite, and NbC/TiC particles distributing dispersively in the matrix. The amount of low-carbon martensite and high-carbon martensite was identical. The alloy system showed high wear resistance due to the formation of dispersed MC type carbides and good toughness due to the exist of low carbon martensite in the matrix. The hardfacing alloy reinforced with complex carbides was also investigated, the microstructure was analyzed and its hardness and wear resistance were evaluated. In conclusion, the distribution, the chemical composition and the amount of the carbides, as well as the matrix microstructure are all factors to influence the crack resistance, hardness and wear resistance of the hardfacing alloys.

The Effect of the Microstructure on the Wear-Resistance in the Welding Deposited Metal

2007 ◽  
Vol 353-358 ◽  
pp. 766-769
Author(s):  
Yuan Bin Zhang ◽  
Hui Luo ◽  
Guo Fan Wang
Keyword(s):  
Wear Resistance ◽  
Testing Machine ◽  
Alloy System ◽  
Wear Testing ◽  
Low Carbon ◽  
Soft Matrix ◽  
Deposited Metal ◽  
The Matrix ◽  
Martensite Matrix ◽  
Carbon Martensite

The microstructure and wear-resistance of the welding deposited metal of Fe-Ti-Nb-V-C and Fe-Cr-W-Mo-C alloy system (with American MG700 as example) are studyed by using SEM , TEM and MM200 wear testing machine. It is revealed that Ti and Nb promote the formation of dispersed MC type carbide granules, while the carbides of Cr and W or Mo tend to precipitate along grain boundary. The formation of MC carbide granules depletes the carbon content in the matrix, and then low carbon martensite matrix can be achieved. The hard and tough matrix and the granular carbides improve the wear-resistance of the deposited metal. But excessive Ti and Nb induce the formation of bigger granules with sharp corner and result too soft matrix, then the wear-resistance decrease. As to the Fe-Cr-W-Mo-C alloy system, network carbides and high carbon martensite matrix make the deposited metal very brittle. During wearing process, the propagating of microcrack in the matrix induces lots of scraps flake off, which decrease the wear-resistance of the deposited metal. The deposited metal of Fe-0.64Ti-1.18Nb-2.18V-1.43Cr-0.97C alloy system in current study achieve the best wear-resistance.

LUCEFIN GROUP 16MnCr5 (1.7131), 16MnCrS5 (1.7139)

Alloy Digest ◽  
2020 ◽  
Vol 69 (8) ◽  
Keyword(s):  
Wear Resistance ◽  
Fatigue Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Wear Resistance ◽  
Medium Size ◽  
Case Hardening ◽  
Low Carbon

Abstract Lucefin Group 16MnCr5 and 16MnCrS5 are low-carbon, 1.2Mn-1Cr, alloy case-hardening steels that are used in the carburized or carbonitrided, and subsequently quench hardened and tempered condition. In general, these steels are used for small and medium size parts requiring high wear resistance and fatigue strength. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-864. Producer or Source: Lucefin S.p.A.

Relations of Low-Carbon Steel Surface Layer Hardness of Hard Facing and Welding Techniques

2010 ◽  
Vol 34-35 ◽  
pp. 1338-1342
Author(s):  
Zheng Guan Ni
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Steel Surface ◽  
Surface Hardness ◽  
Low Carbon Steel ◽  
Surface Electrode ◽  
Low Carbon ◽  
Wear Resistant ◽  
Cladding Layer ◽  
Carbon Steel Surface

through super-hard wear-resistant surface electrode surfacing D707 in Low-carbon steel. We have analysis the effect of welding process parameters and post-weld heat treatment process on low carbon steel surface hardness of cladding layer. The experimental results show that: after quenching hardness value no significant change; But after annealing the hardness value decreased and after annealing the crystal grain of the underlying tissues uniformization become tiny. micro-hardness testing is carried out in the weld cross-section, we have find out that from the base metal to the cladding layer the surface hardness values is getting higher and higher, while the indentation is getting smaller and smaller. Because hardness is a measure of wear resistance materials, thus it can indirectly show that when low-carbon steel surface electrode in the super-hard wear-resistant surfacing welding layer, it can improve the surface hardness of low carbon steel and improve wear resistance of low carbon steel surface.

Metal-matrix composite fabricated with gas tungsten arc melt injection and precoated with NiCrBSi alloy to increase the volume fraction of WC particles

2017 ◽  
Vol 24 (2) ◽  
pp. 195-202 ◽  
Author(s):  
Aiguo Liu ◽  
Da Li ◽  
Fanling Meng ◽  
Huanhuan Sun
Keyword(s):  
Wear Resistance ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Low Carbon Steel ◽  
High Volume ◽  
Wear Loss ◽  
Low Carbon ◽  
Gas Tungsten Arc ◽  
The Matrix ◽  
Gas Tungsten

AbstractThe volume fraction, dissolution, and segregation of WC particles in metal-matrix composites (MMCs) are critical to their wear resistance. Low carbon steel substrates were precoated with NiCrBSi coatings and processed with gas tungsten arc melt injection method to fabricate MMCs with high volume fraction of WC particles. The microstructures and wear resistance of the composites were investigated. The results showed that the volume fraction of WC particles increased with decreasing hopper height and was as high as 44% when hopper height was 100 mm. The dissolution of WC particles was minimal. The content of the alloying elements decreased from the top to the bottom of the matrix. More WC particles dissolved in the overlapping area, where Fe3W3C carbide blocks could be found. The wear loss of the MMCs after 40 min was 6.9 mg, which is 76 times less than that of the substrate after the 4 min test.

An Impact-Abrasion Resistant Surfacing Electrode and its Wear-Resistant Mechanism

2008 ◽  
Vol 373-374 ◽  
pp. 547-550
Author(s):  
Zheng Jun Liu ◽  
Xie Bo Zeng
Keyword(s):  
Experimental Investigation ◽  
Wear Resistance ◽  
Work Hardening ◽  
Alloy System ◽  
Wear Loss ◽  
Impact Wear ◽  
Technological Properties ◽  
Wear Resistant ◽  
Abrasion Test ◽  
The Impact

Aiming at improving the impact wear-resistant performance of metals, a new sort of surfacing electrode named TKCE50 was developed in this paper. This electrode is a Fe-Mn-Cr-Mo-V alloy system and belongs to iron-base wear-resistant materials. Tests like hardness, wear loss and impact-abrasion test were performed on the samples surfaced with the electrode. The results indicated that TKCE50 had not only good welding technological properties, but also super work-hardening effect and perfect impact wear-resistance. In addition, the work-hardening and wear-resistant mechanisms for this electrode were discussed based on corresponding experimental investigation and theoretical analysis.

Investigation of the Microstructures and Mechanical Properties of Nano- and Sub-Micron Composite Low Carbon Alloy Steel

2006 ◽  
Author(s):  
Chunde Jia ◽  
Zhanqiang Duan ◽  
Shutong Yang ◽  
Guohui Zhang ◽  
Zhuangzhi Xu
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
White Layer ◽  
Engineering Application ◽  
High Hardness ◽  
Diffusion Method ◽  
High Wear Resistance ◽  
Low Carbon ◽  
The Matrix ◽  
Composite Steel

The low carbon alloy steel was single face treated by a special hot diffusion method, and thus the gradual composite steel was produced. The microstructures of composite steel were very different from the matrix steel, white layer speared near the treated surface, and nano- and sub-micron particles were existed in the white layer. The results of ramon spectrum test indicated that the nano- and sub-micron particles can transfer several millimeters, several centimeters or even more. The mechanical properties changed sharply compared with the matrix steel. The hardness and the tensile strength near the treated surface were much higher than the matrix steel, and decreased gradually with the increase of distance to the treated surface. The composite steel has high strength, high hardness, high wear-resistance, high corrosion-resistance and etc. From the engineering application point of view, this technique can be used to produce super high qualities alloy steels, which can be used to the field as: metallurgy, mine, automobile, manufacture, energy sources, and etc.

scholarly journals Effect of B Content on Microstructure and Wear Resistance of Fe-3Ti-4C Hardfacing Alloys Produced by Plasma-Transferred Arc Welding

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 265 ◽  
Author(s):  
Lin Zong ◽  
Ning Guo ◽  
Rongguang Li ◽  
Hongbing Yu
Keyword(s):  
Wear Resistance ◽  
Volume Fraction ◽  
Lath Martensite ◽  
Testing Machine ◽  
High Hardness ◽  
Wear Testing ◽  
Low Carbon ◽  
Hardfacing Alloy ◽  
Plasma Transferred Arc ◽  
Transferred Arc

The Fe-3Ti-xB-4C (x = 1.71, 3.42, 5.10, 6.85 wt. %) hardfacing alloys are deposited on the surface of a low-carbon steel by plasma transferred arc (PTA) weld-surfacing process. Microstructure, hardness and wear resistance have been investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), Rockwell hardness tester and abrasive wear testing machine, respectively. The results show that the microstructure in all alloys is composed of austenite, martensite, Fe23(C,B)6, Ti(C,B) and Fe2B. The volume fraction of eutectic borides and Ti(C,B) carbides increases with increasing B content. Many brittle bulk Fe2B phase arises when the boron content increases to 6.85%, which causes the formation of microcracks in the hardfacing layer. The microhardness of the hardfacing alloys is significantly improved with the B addition, however, the wear resistance of hardfacing alloys increases firstly and then decreases with increasing of B content. The hardfacing alloy with the 5.10% B content has the best wear resistance, which is attributed to high volume fraction of eutectic borides and fine Ti(C,B) particles distributed in the austenite and lath martensite matrix with high hardness and toughness. The formation of brittle bulk Fe2B particles in the hardfacing alloy with the 6.85% B leads to the fracture and spalling of hard phases during wear, thus, reducing the wear resistance.

Investigation on microstructures, mechanical and wear properties of Al 390/ZrO2 composite materials fabricated by P/M method

2020 ◽  
Vol 17 (1) ◽  
pp. 149-166
Author(s):  
Karthikeyan S ◽  
Karunanithi R ◽  
Ashoke Ghosh
Keyword(s):  
Wear Resistance ◽  
Wear Test ◽  
Matrix Alloy ◽  
Sem Analysis ◽  
High Wear Resistance ◽  
Wear Properties ◽  
Content Type ◽  
The Matrix ◽  
Pin On Disc ◽  
A390 Alloy

PurposeAluminium is the most proficiently and commonly used metal due to its desirable physical, chemical and mechanical properties. When Aluminium reinforced with hard ceramic particles, shows increased strength and good corrosion resistant and wear resistant qualities. In the present investigation, A390 + X vol. % Zro2 (X = 5, 10 and 15) composites have been fabricated through P/M technique.Design/methodology/approachAfter that the microstructural properties are tested by scanning electron microscope (SEM) analysis wear test is performed using pin-on-disc machine.FindingsThe wear conditions of applied load 30N and sliding velocity 1 m/s and track distance 1000m was followed. A390 + 15% Zro2 of surface of the composites unveiled greater hardness when compared with A390 alloy.Originality/valueA390 + 15% Zro2 exhibited superior wear resistance than that of the matrix alloy. Thus the material proves as an excellent solution for applications that requires high wear resistance.

Nanomechanical Properties of Amorphous Carbon and Carbon Nitride Thin Films Prepared by Shielded Arc Ion Plating

1999 ◽  
Vol 593 ◽  
Author(s):  
N. Tajima ◽  
H. Saze ◽  
H. Sugimura ◽  
O. Takai
Keyword(s):  
Thin Films ◽  
Wear Resistance ◽  
Amorphous Carbon ◽  
Carbon Nitride ◽  
Arc Discharge ◽  
High Wear Resistance ◽  
Substrate Bias Voltage ◽  
Wear Resistant ◽  
Arc Ion Plating ◽  
Ion Plating

ABSTRACTHydrogen free amorphous carbon (a-C) and carbon nitride (a-C:N) were synthesized by means of shielded arc ion plating in which a shielding plate was inserted between a target and a substrate in order to reduce macroparticle deposition onto the substrate. Using a graphite target as a cathode, thin films of a-C and a-C:N were prepared in an arc discharge plasma of argon or nitrogen gas, respectively, at a pressure of 1 Pa. Based on nanoindentation, mechanical properties of these films were studied in relation to substrate bias voltage (Vs). The a-C films prepared at Vs ranging from -50 to -200 V consisted of diamond-like phase and showed hardness higher than 20 GPa with its maximum of 35 GPa at Vs = -100 V. However, hardness of the films deposited at Vs < 300 V was less than 7 GPa indicating that the films were converted to graphite-like phase due to excessive ion impact in Ar plasma. Wear resistance of the a-C films was closely related to their hardness. Namely, a harder a-C film was more wear resistant. On the contrary, hardness of the a-C:N films was less dependent on Vs. It remained in the range of 10 to 15 GPa and was much lower than the maximum hardness of the a-C films. Nevertheless, the wear resistance of the a-C:N films was comparable to or much better than the a-C films. In particular, the a-C:N film prepared at Vs = -300 V was so wear resistant that the film showed no apparent wear when rubbed with a diamond tip less than 100 nm in tip-diameter at a contact force of 20μN. The presence of β-C3N4like phase characterized by a N1 s XPS peak at 400.5 eV has found to be crucial for high wear resistance of the a-C:N films

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