Ferrous Metals Flashcards
0
Q
Effects of phosphorus
A
- increases strength and hardness
- decreases ductility and notch impact toughness
1
Q
Affect of manganese on iron
A
- better surface finish
- contributes to strength and hardness
- decreases ductility and weld ability
2
Q
Effects of silicon
A
- deoxidisers
- surface quality.
3
Q
Effects of chromium
A
- increases corrosion resistance
- increase harden ability
- improve high temp strength
4
Q
Effect of nickel
A
- increases strength
- increases harden ability
- increases impact strength
5
Q
Molybdenum
A
- enhances creep strength
- increases harden ability
6
Q
Aluminium
A
- deoxidiser
- controls grain growth
7
Q
Cast iron contains % carbon
A
2-6%
8
Q
Pig iron contains % carbon
A
4%
9
Q
Ferrite contains % carbon
A
0.006%
10
Q
Cementite contains % carbon
A
6.67%
11
Q
Case hardening carbon %
A
Increases to 0.83%
12
Q
Annealing define
A
- Makes steel soft, ductile and stress free
- slowly heated and slowly cooled
13
Q
Normalising define
A
- Heated slowly to above upper critical point
- cooled in the air
- restore toughness in heat or work hardened metal
14
Q
Hardening define
A
- heated to full annealing temp
- quenched for rapid cooling
- creation of martensite
- needs 0.4%<
15
Q
Tempering define
A
- Similar to normalising but hardness retained
- reduce the brittleness after hardening
16
Q
Cyanide hardening
A
- roughly 900 c
- for hardening layer of 0.1 to 0.25mm
- sodium cyanide
17
Q
Carbon content of low carbon steel
A
0.3%
18
Q
Carbon content of medium carbon steel
A
0.3 to 0.8%
19
Q
High carbon steel carbon content
A
0.8 to 1.7%
