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Question 1 The following is a photomicrograph of the surface of a polished and etched polycrystalline specimen of an iron-chromium alloy with the grain boundaries revealed as dark lines. Determine: (i) the mean intercept length (1) of the grains in millimeters, and (ii) the ASTM grain size number, G. (For part (i), use at least seven straight line segments for the determination. Also, use the scale bar to estimate the magnification at which this photomicrograph was taken). Figure 4.15 (b) from Callister & Rethwisch 100 μm

Question 1 The following is a photomicrograph of the surface of a polished and etched polycrystalline specimen of an iron-chromium alloy with the grain boundaries revealed as dark lines. Determine: (i) the mean intercept length (1) of the grains in millimeters, and (ii) the ASTM grain size number, G. (For part (i), use at least seven straight line segments for the determination. Also, use the scale bar to estimate the magnification at which this photomicrograph was taken). Figure 4.15 (b) from Callister & Rethwisch 100 μm

Welding: Principles and Applications (MindTap Course List)
Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Larry Jeffus
Chapter26: Welding Metallurgy
Section: Chapter Questions
Problem 7R
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Question 1 The following is a photomicrograph of the surface of a polished and etched polycrystalline specimen of an iron-chromium alloy with the grain boundaries revealed as dark lines. Determine: (i) the mean intercept length (1) of the grains in millimeters, and (ii) the ASTM grain size number, G. (For part (i), use at least seven straight line segments for the determination. Also, use the scale bar to estimate the magnification at which this photomicrograph was taken). Figure 4.15 (b) from Callister & Rethwisch 100 μm
Transcribed Image Text:Question 1 The following is a photomicrograph of the surface of a polished and etched polycrystalline specimen of an iron-chromium alloy with the grain boundaries revealed as dark lines. Determine: (i) the mean intercept length (1) of the grains in millimeters, and (ii) the ASTM grain size number, G. (For part (i), use at least seven straight line segments for the determination. Also, use the scale bar to estimate the magnification at which this photomicrograph was taken). Figure 4.15 (b) from Callister & Rethwisch 100 μm
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