11/17/17Hardness Tests and Hardness Number Conversions

2018 ◽  
Author(s):  
Keyword(s):  
Hardness Number

Contact Rigidity at Tool Shank of Turning Tools

1987 ◽  
Vol 109 (2) ◽  
pp. 169-172 ◽  
Author(s):  
E. Marui ◽  
S. Ema ◽  
S. Kato
Keyword(s):  
Experimental Investigation ◽  
Contact Area ◽  
Vickers Hardness ◽  
Flexural Rigidity ◽  
Vickers Hardness Number ◽  
Empirical Expressions ◽  
Contact Rigidity ◽  
Hardness Number ◽  
Tool Shank

This paper presents an experimental investigation of the contact rigidity between a turning tool shank and tool post. The contact rigidity is influenced by the flexural rigidity of tool shank, contact area in the tool shank and the Vickers hardness number of the shank material. The effects of these parameters on the contact rigidity are estimated by simple empirical expressions.

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.

scholarly journals A new method for hardness determination from depth sensing indentation tests

1996 ◽  
Vol 11 (12) ◽  
pp. 2964-2967 ◽  
Author(s):  
J. Gubicza ◽  
A. Juhász ◽  
J. Lendvai
Keyword(s):  
Contact Pressure ◽  
Elastic Material ◽  
Depth Sensing ◽  
Hardness Number ◽  
Indentation Tests ◽  
Semiempirical Formula ◽  
Loading And Unloading ◽  
The Mean ◽  
Limiting Case

A new semiempirical formula is developed for the hardness determination of the materials from depth sensing indentation tests. The indentation works measured both during loading and unloading periods are used in the evaluation. The values of the Meyer hardness calculated in this way agree well with those obtained by conventional optical observation, where this latter is possible. While the new hardness formula characterizes well the behavior of the conventional hardness number even for the ideally elastic material, the mean contact pressure generally used in hardness determination differs significantly from the conventional hardness number when the ideally elastic limiting case is being approached.

scholarly journals Prediction of Drivage Rate of Roadheader by Rock Impact Hardness Number (RIHN).

1994 ◽  
Vol 110 (6) ◽  
pp. 499-503
Author(s):  
Hideki SHIMADA ◽  
Kikuo MATSUI
Keyword(s):  
Hardness Number

scholarly journals Rockwell Hardness Testing of Pure Nickel Collimators for BNCT Application

2019 ◽  
Vol 36 (1) ◽  
pp. 23-27
Author(s):  
Erasmus Prakasita ◽  
Yohanes Sardjono ◽  
Budi Setyahandana
Keyword(s):  
Centrifugal Casting ◽  
Hardness Test ◽  
Hardness Testing ◽  
Hardness Number ◽  
Boron Neutron Capture ◽  
Material Hardness ◽  
Before And After ◽  
The Difference ◽  
Almost All

In this study, Rockwell and Brinell hardness testing was used to examine material hardness. These methods were chosen because they are easy to carry out, relatively inexpensive, and almost all sizes and shapes can be tested, in which nickel hardness before and after centrifugal casting are identified and compared. These tests enable the determination of the hardness numbers of nickel collimators using for boron neutron capture therapy. The samples were five nickel plates with a dimension of 4.5 × 4.5 cm and five collimators. The collimators were cylindrical and made using centrifugal casting. The basic principle of the hardness test was to apply loading on the object being tested. The Rockwell test was used to assess the material's hardness from the difference of indentation depth, while the Brinell test was used to determine the hardness from the diameter of indentation. From the results of this test, the hardness number of nickel before centrifugal casting is 168.53 BHN or 86.13 HRB, while the hardness number after centrifugal casting is 115.68 BHN or 64.84 HRB. It can therefore be concluded that centrifugal casting decreased nickel hardness.

Sign in / Sign up

Export Citation Format

Share Document