Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Q/ Correct the under line words
1-Ferrous alloys above 6.67%ls has structure of FeC+ Cementite.
2- Ferrous alloys have FCC. structure at temp. Of 25 - 723 C° and temp.
1294 - 1538c°
3. The difference between gas carburizing and pack carburizing is the
atmosphere type (liquid or gas)
4. Steel of 2.13 % C can be used for feeds applications
5. The yield strength of high alloy steel can be increased by adding No,
Mg. Ti elements
6-Steel of (1.6 1.9) % Mn + (0.3_0.4)% C has higher strength than high
carbon steel but more 3.14% Mn steel because ductile
7. Ni and Cr adding give pearlite phase at R.T. and such steel can
hardened by annealing
8. at high temp. ferritic steel is used because such steel don't
transferred to berlitic structure during cooling to R.T. and remain
ferritic Structure
9. mealable cart iron has good machinability because graphite noduler
act as chip breakers Flakes
10.pearlite phase when cooling to 723C° give structure of Fe;C +cemintite
11. Sulpher in cast iron ,its effaced to stabilize pearlite and increase
ductility
12. Graphite of flak shape can be changed to spheres shape by adding
Mn or Ti elements.
13. The effect of working on Al. alloys is the fragment of grains to
decrease the number of grains
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