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What is hardness? Explain hardness test methods. Is there any correlation between hardness and tensile strength? Please explain.

What is hardness? Explain hardness test methods. Is there any correlation between hardness and tensile strength? Please explain.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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What is hardness? Explain hardness test methods. Is there any correlation between hardness and tensile strength? Please explain.

Table 5.2 A Tabulation of Diffusing Species D(m²/s) Host Metal QJ/mol) Diffusion Data Interstitial Diffusion Fe (a or BCC) 1.1 x 10- 87,400 Fe (y or FCC) 2.3 x 10- 148,000 Fe (a or BCC) 5.0 x 10-7 77,000 N° Fe (y or FCC) 9.1 x 10- 168,000 Self-Diffusion Fe Fe (a or BCC)“ Fe (y or FCCY 2.8 x 10- 251,000 Fe 5.0 x 10- 284,000 Cu (FCC) Al (FCC) Cu 2.5 x 10- 200,000 Al 2.3 x 10- 144,000 Mg Mg (HCP) 1.5 x 10 136,000 Zn Zn (HCP) 1.5 x 10- 94,000 Mo Mo (BCC) 1.8 x 10- 461,000 Ni Ni (FCC) 1.9 x 10 285,000 Interdiffusion (Vacancy) Cu (FCC) Zn (HCP) Zn 2.4 x 10- 189,000 Cu 2.1 x 10- 124,000 Cuf Al (FCC) 6.5 x 10- 136,000 Mg Al (FCC) 1.2 x 10- 130,000 Cuf Ni (FCC) 2.7 x 10- 256,000 Ni Cu (FCC) 1.9 x 10- 230,000 *There are two sets of diffusion coefficients for iron because iron experiences a phase trans- formation at 912°C; at temperatures less than 912°C, BCC a-iron exists; at temperatures higher than 912°C, FCC y-iron is the stable phase.
Transcribed Image Text:Table 5.2 A Tabulation of Diffusing Species D(m²/s) Host Metal QJ/mol) Diffusion Data Interstitial Diffusion Fe (a or BCC) 1.1 x 10- 87,400 Fe (y or FCC) 2.3 x 10- 148,000 Fe (a or BCC) 5.0 x 10-7 77,000 N° Fe (y or FCC) 9.1 x 10- 168,000 Self-Diffusion Fe Fe (a or BCC)“ Fe (y or FCCY 2.8 x 10- 251,000 Fe 5.0 x 10- 284,000 Cu (FCC) Al (FCC) Cu 2.5 x 10- 200,000 Al 2.3 x 10- 144,000 Mg Mg (HCP) 1.5 x 10 136,000 Zn Zn (HCP) 1.5 x 10- 94,000 Mo Mo (BCC) 1.8 x 10- 461,000 Ni Ni (FCC) 1.9 x 10 285,000 Interdiffusion (Vacancy) Cu (FCC) Zn (HCP) Zn 2.4 x 10- 189,000 Cu 2.1 x 10- 124,000 Cuf Al (FCC) 6.5 x 10- 136,000 Mg Al (FCC) 1.2 x 10- 130,000 Cuf Ni (FCC) 2.7 x 10- 256,000 Ni Cu (FCC) 1.9 x 10- 230,000 *There are two sets of diffusion coefficients for iron because iron experiences a phase trans- formation at 912°C; at temperatures less than 912°C, BCC a-iron exists; at temperatures higher than 912°C, FCC y-iron is the stable phase.
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