Effect of ion implantation on fatigue strength of martensite stainless steel and surface hardness evaluation by ultra micro hardness tester Tanaka, T, Nakayama, H. and Kato, M. J. Soc. Mater. Sci. Jpn. (1995) 44 (497), 201–206 (in Japanese)

1997 ◽  
Vol 19 (3) ◽  
pp. 264
Keyword(s):  
Stainless Steel ◽  
Fatigue Strength ◽  
Ion Implantation ◽  
Surface Hardness ◽  
Micro Hardness ◽  
Hardness Tester

Comparison of Commercially Pure Titanium Surface Hardness Improvement by Plasma Nitrocarburizing and Ion Implantation

2013 ◽  
Vol 789 ◽  
pp. 347-351 ◽  
Author(s):  
Agung Setyo Darmawan ◽  
Waluyo Adi Siswanto ◽  
Tjipto Sujitno
Keyword(s):  
Ion Implantation ◽  
Elevated Temperatures ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Commercially Pure Titanium ◽  
Hardness Tester ◽  
Hardness Number ◽  
Commercially Pure ◽  
Hardness Tests ◽  
Plasma Nitrocarburizing

Commercially pure (cp) titanium has a relative soft hardness property. In particular usage such as sliding, the improvement of the surface hardness will be required. In this study, surface hardness improvement of cp titanium by Plasma Nitrocarburizing and Ion Implantation are compared. Plasma Nitrocarburizing processes are conducted at different elevated temperatures with different duration processes, i.e. at 350 °C for 3, 4, and 5 hours, and at 450 °C for 2, 3, and 4 hours respectively, while Ion Implantation processes are conducted at room temperature and process durations are varied as 2.3 hours, 4.7 hours, and 9.3 hours. Nitrogen ions are used to implant the material. Hardness tests are then performed on each specimen by using Micro Vickers Hardness Tester. The surface hardness number (HV) for specimens of the Plasma Nitrocarburizing processes at temperature of 350 °C for process duration of 3 hours, 4 hours, and 5 hours are 74.16, 92.25 and 94.41, respectively while those at temperature of 450 °C for duration process of 2 hours, 3 hours, and 4 hours are 103.70, 121.31 and 126.17, respectively. The processes of Ion Implantation produce the surface hardness number (HV) of 88.97, 125.51, and 130.2, for duration processes of 2.3 hours, 4.7 hours, and 9.3 hours. The process of Ion Implantation produce higher surface hardness number than the Plasma Nitrocarburizing process at temperature 350 °C but the surface hardness number is lower when compared to the Plasma Nitrocarburizing at a temperature of 450 °C. For the duration processes 4 hours and more, the process of Ion Implantation produces the same surface hardness number with the Plasma Nitrocarburizing at temperature of 450 °C.

Effect of CeO2 on Microstructure and Hardness of Roller Surface Alloyed by Laser

2012 ◽  
Vol 155-156 ◽  
pp. 877-880
Author(s):  
Huai Jun Yue ◽  
Qi Bin Liu
Keyword(s):  
Co2 Laser ◽  
Testing Machine ◽  
Surface Hardness ◽  
Service Performance ◽  
Micro Hardness ◽  
Rockwell Hardness ◽  
Hardness Testing ◽  
Coating Materials ◽  
Hardness Tester ◽  
Molten Liquid

To improve the service performance of roller. The surface of roller was alloyed by a 5kW CO2 laser. The effect of CeO2 on microstructure and hardness was studied by means of OM, Micro-hardness Testing Machine and Rockwell hardness tester. The results indicate that addition of CeO2 into coating materials can enhance the fluidity of molten liquid, refine and purify microstructure and increase microhardness and surface hardness of alloying coating.

Characterization on Duplex Treated Coating Fabricated by Laser Cladding and Active Screen Plasma Nitriding

2011 ◽  
Vol 69 ◽  
pp. 93-98
Author(s):  
Xiao Dong Zhang ◽  
Bin Shi Xu ◽  
Shi Yun Dong ◽  
Zhi Jian Wang ◽  
Han Shan Dong ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Plasma Nitriding ◽  
White Layer ◽  
Surface Hardness ◽  
Nitrogen Diffusion ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
Active Screen Plasma Nitriding ◽  
Active Screen

In order to enhance the performances of laser remanufacturing part, we combined laser cladding with active screen plasma nitriding duplex treatment to repair metal part. The microstructure, phase structure and micro-hardness of duplex treated coating were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness tester. Wear tests were carried out on reciprocating wear tester under dry sliding condition. The results show that the white layer and the nitrogen diffusion layer were formed after nitriding treatment. The duplex treated coating consists mainly of γ-Fe, CrN, Fe4N and Fe3N. The duplex treated coating improved not only surface hardness but also wear resistance.

Investigation on Surface Integrity of STAVAX ESR AISI 420 Martensitic Stainless Steel by Cryogenically Treated Steel Balls with Low Plastic Burnishing Tool

2012 ◽  
Vol 504-506 ◽  
pp. 1347-1352
Author(s):  
Sivapraksam Thamizhmanii ◽  
K. Rajendran ◽  
Mohideen Rasool ◽  
Sulaiman Hassan
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Integrity ◽  
Feed Rate ◽  
Martensitic Stainless Steel ◽  
Surface Hardness ◽  
Operating Parameters ◽  
Micro Hardness ◽  
Aisi 420 ◽  
Steel Balls

Low plasticity burnishing (LPB) is a new method of surface improvement, which raises the burnishing to the next level of sophistication. LPB can provide deep compression for improved surface characteristics. The study focuses on the surface roughness, micro-hardness and surface integrity aspects on soft AISI 420 STAVAX ESR martensitic stainless steel AISI 420 material. This material is pronounced as difficult to cut materials like titanium, Inconel 718 etc. The investigation of surface integrity was done on this materials in terms of operating parameters like sliding speed, feed rate and depth of penetration (DOP) identifying the predominant factors among the selected parameters. The steel balls used were cryogenically treated at sub zero temperature of -176 degrees. Sub-surface micro-hardness study were also done to asses the depth of compression altered zone, surface roughness and surface hardness. The process can be applied to critical components effectively as the LPB process has cycle time advantages and also low investment cost. This can be also realized by introducing on high speed machines. This process was studied by using cryogenically treated different ball diameters at various operating parameters. This also improved on concentricity of work material. More the depth of compression produced low surface roughness at low sliding speed, feed rate with larger ball diameter. The DOP also helps to improve on surface and sub-surface hardness and close roundness. There are limitations on DOP beyond which the surface deteriorated.

scholarly journals Effect of nano TiC on microstructure and microhardness of composite additive manufacturing 316L stainless steel

2021 ◽  
Author(s):  
Weiguang Yang ◽  
Xi Wang ◽  
Hai Zhou ◽  
Ti Zhou
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
316L Stainless Steel ◽  
Surface Hardness ◽  
Lower Surface ◽  
Element Distribution ◽  
Manufacturing Technology ◽  
Steel Matrix ◽  
Hardness Tester ◽  
Additive Manufacturing Technology

Abstract The lower surface hardness limits the further application of 316 L stainless steel. In this study, selective laser melting (SLM)/laser metal deposition (LMD) composite additive manufacturing technology was used to prepare five kinds of 316L-nano-TiC cermet strengthening layers on the surface of 316L stainless steel, and to study the effect of nano-TiC particle content on the microstructure and the influence of microhardness. Use Laser microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD) to analyze the structure, element distribution and phase composition of the strengthening layer. The hardness of the strengthened layer was analyzed using a Vickers micro-hardness tester. The study found that the composite SLM/LMD formed samples changed continuously from LMD forming to SLM forming, showing good metallurgical bonding. Diffusion of TiC particles was observed in the SLM strengthening layer, and TiC phase was detected in the strengthening layer. Compared with the 316L matrix, the microhardness of the strengthened layer is significantly improved. When 50wt% TiC is added, the average hardness of the strengthened layer is 1.9 times that of the 316L matrix, and the highest is 408.9HV. The results of this study show that the strengthening layer manufactured by composite additive materials can effectively improve the hardness of the 316L stainless steel matrix. As the content of nano-TiC in the preset powder increases, the microhardness of the strengthening layer first increases and then decreases, and the hardness of the 50wt% TiC strengthening layer is the highest. There are distributed nano-TiC particles in the structure of the strengthening layer, and the distribution of nano-TiC particles in the 50wt% TiC strengthening layer is more uniform than other samples. This research provides a new reference for the strengthening of 316L stainless steel through SLM/LMD composite additive manufacturing technology and the addition of nano-TiC particles.

Effect of Deposition Time on Hardness and Bonding Strength of Magnetron Sputtered TiN Coatings on 316 Stainless Steel

2017 ◽  
Vol 726 ◽  
pp. 303-307 ◽  
Author(s):  
Hao Zhang ◽  
Chen Gang Luo ◽  
Shu Wang Duo ◽  
Qiang Liu ◽  
Ru Chun Wen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Deposition Time ◽  
Great Influence ◽  
Adhesive Force ◽  
Micro Hardness ◽  
Tin Coating ◽  
Hardness Tester ◽  
Tin Coatings ◽  
Comprehensive Performance ◽  
Composite Hardness

TiN coatings were prepared under different deposition time by magnetron sputtering technology. The effects of deposition time on microstructure and properties of TiN coatings were investigated by SEM, EDS, XRD, micro-hardness tester and scratch instrument, respectively. Results showed that coating thickness was gradually increasing with the prolonging of deposition time; The phases were mostly cub-TiN and a small amount of metal hex-Ti and tetr-Ti2N in TiN coatings; Deposition time has a great influence on surface morphology of TiN coatings; The hardness and adhesion of TiN coating both increased firstly and then decreased with the increase of deposition time. In this paper, TiN coating, whose thickness was 4 mm when deposition time was 5 hour, had excellent comprehensive performance, i.e., TiN coating was dense and smooth and its composite hardness was 34.46 GPa and its adhesive force was 16.00 N.

Wear Resistance of Ion Implanting Tungsten Carbide on 65Mn Steel Used as Harrow Disk

2014 ◽  
Vol 1030-1032 ◽  
pp. 259-262 ◽  
Author(s):  
Hai Yang ◽  
Ren Bao Jiao ◽  
Shu Yang Wang
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Tungsten Carbide ◽  
Sandy Soil ◽  
Surface Hardness ◽  
Working Life ◽  
Optical Microscope ◽  
Micro Hardness ◽  
Hardness Tester ◽  
Carbide Layer

To improve the harrow disk made of 65Mn steel working life, an ion implanting metal in order to obtain tungsten carbide treatment was proposed in this work. Microstructure and phase composition of 65Mn steel obtained by ion implanting tungsten carbide process were analyzed by optical microscope and XRD, respectively. The surface hardness was tested by microscopic hardness tester, and the wear resistant performance of the wear layer was tested by abrader abrasor. The results showed that the micro-hardness of ion implanting tungsten carbide layer can be reached 1100 HV0.2, higher than that of 65Mn steel, the thickness of tungsten carbide layer was 400μm, which greatly improve the wear resistance. Harrow disk after the ion implanting tungsten carbide exhibited the excellent wear resistance in the sandy soil, and its working life was more than twice the length of the genera treatment harrow disk.

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