Design and Performance of a Deadweight Standard Rockwell Hardness Testing Machine

1978 ◽  
Vol 6 (4) ◽  
pp. 276
Author(s):  
RT Horstman ◽  
KC Lieb ◽  
RL Meltzer ◽  
IC Moore ◽  
G Barbato ◽  
...  
Keyword(s):  
Testing Machine ◽  
Rockwell Hardness ◽  
Hardness Testing ◽  
And Performance

Influence of High Temperature Annealing on Microstructure Evolution of Ni-24Fe-14Cr-8Mo Superalloy

2021 ◽  
Vol 904 ◽  
pp. 117-123
Author(s):  
Yi Cui ◽  
Yun Fei Zhang ◽  
Yan Guang Han ◽  
Da Lv
Keyword(s):  
High Temperature ◽  
Microstructure Evolution ◽  
Testing Machine ◽  
Aging Treatment ◽  
Growth Patterns ◽  
High Temperature Annealing ◽  
Rockwell Hardness ◽  
Hardness Testing ◽  
X Ray Diffraction ◽  
X Ray

The effect of high temperature annealing on microstructure evolution of Ni-24Fe-14Cr-8Mo alloy was investigated through Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Rockwell Hardness Testing Machine. Three kinds of grain growth patterns were found at different annealing temperatures due to carbides precipitation and dissolution. After a combination of high temperature annealing and aging treatment, the hardness versus time curves performed a parabolic pattern. The highest hardness was achieved under 1070°C/60 minutes treatment, and the desirable annealing time should be 60 minutes to 90 minutes.

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.

scholarly journals INVESTIGATION OF CONTACT FATIGUE AND OPERATING PERFORMANCE OF NI-WC COMPOSITE ELECTROCOATED GEARS

2015 ◽  
Vol 8 (1) ◽  
pp. 1472-1477
Author(s):  
KETAN BHAT ◽  
Maneesh Avadhani ◽  
Milind Gurav ◽  
Vadiraj Patil ◽  
M. Krishna
Keyword(s):  
Operating Performance ◽  
Testing Machine ◽  
Contact Fatigue ◽  
Rockwell Hardness ◽  
Hardness Testing ◽  
X Ray Diffraction ◽  
Test Rig ◽  
Operation Condition ◽  
X Ray ◽  
Resistance To Wear

The objective of the work was to evaluate contact fatigue and operating performance of electrodeposited Ni-WC composite coated gears using experimental technique. The electrodeposited Ni-WC coating was characterized for coating thickness, hardness and crystal structure using Electro-Physik gauge, Rockwell Hardness testing machine and X-Ray Diffraction respectively. The operation condition was estimated using designed test rig and vibration pick with CRO. The results show that coated gears are smoother in operation and offer more resistance to wear and fretting due to increased hardness.

Structure and Properties of the 32CrMoV12-28 Steel Alloyed with WC Powder Using HPDL Laser

2006 ◽  
Vol 530-531 ◽  
pp. 334-339 ◽  
Author(s):  
Leszek Adam Dobrzański ◽  
Krzysztof Labisz ◽  
Marek Piec ◽  
Józef Lelątko ◽  
Andrzej Klimpel
Keyword(s):  
Testing Machine ◽  
Good Work ◽  
Structure And Properties ◽  
Hardness Testing ◽  
Structure Changes ◽  
Tool Surface ◽  
Hot Work Steel ◽  
Power Diode ◽  
Work Stability ◽  
High Power Diode Laser

This paper presents the investigation results of laser alloying and the influence on structure and properties of the surface of the 32CrMoV12-28 hot work steel, carried out using the high power diode laser (HPDL). Structure changes were determined in the work, especially structure fragmentation. Also hardness investigation of the different remelting areas was performed. The reason of this work was also to determine the laser treatment parameters, particularly the laser power, to achieve good work stability and to make the tool surface more resistant for work extremal conditions. Based on microstructural examinations of the obtained material, the distribution of the reinforcing ceramic particles in the hot work tool steel was revealed. Tungsten carbide WC powder was used for alloying. The remelted layers which were formed on the surface of the investigated hot work steel were examined metallographically and analyzed using a hardness testing machine.

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