Quiz5spring2004 - ENSC 3313, Spring 2004 Quiz 5 ANSWERS...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
ENSC 3313, Spring 2004 Quiz 5 ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. The two most common hardness scales in the USA are Brinell and Rockwell. The Brinell utilizes a 10mm tungsten carbide ball, a 3000 kg load and hardness is measured as load/indentation area. You have used the Rockwell B scale (HRB). What is a) the indenter, b) the load, and c) what is the measure of hardness? a) a 1/16 inch diameter hardened steel (or WC) ball b) 100 kg c) depth of penetration Such a test is easy to do and has a dial read-out, so was developed for use by unskilled personnel in industry. The surface does not have to be prepared. Ref text, ~p 135-40. Note the Brinell test is ASTM ,E10 and the Rockwell is ASTM, E18 2. Name and give a brief description of three ways to strengthen a metal that we discussed in class. 1) Grain size refinement – Grain boundaries represent a discontinuity in the orientation of the crystal lattice and, therefore, a barrier to dislocation motion. If you decrease the size of the grains, you automatically increase the number of grain boundaries and strengthen the material.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Quiz5spring2004 - ENSC 3313, Spring 2004 Quiz 5 ANSWERS...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online