Mechanical Engineering - Engineering Materials - Discussion
Discussion Forum : Engineering Materials - Section 1 (Q.No. 42)
42.
The hardness of steel increases if it contains
Discussion:
17 comments Page 1 of 2.
R Praveen said:
8 years ago
The hardness due to Martensite is due to the transformation of austenite, due to heat treatment, although the composition remains the same.
In case of cementite, the hardness is due to the composition, in which the carbon content is higher, without undergoing any heat treatment (solely based on the solubility of carbon).
In case of cementite, the hardness is due to the composition, in which the carbon content is higher, without undergoing any heat treatment (solely based on the solubility of carbon).
Bhargav said:
7 years ago
Martensite is the hardest form of steel which is produced by Directly quenching it in oil or water after heat treatment process but their is presence of cementite, So cementite (Fe3C) is necessary to increase the hardness of steel, So cementite is the correct answer.
(1)
Sarath simhadri said:
9 years ago
Jominy end-quench test is heated to austenite phase to martensite phase after that steel hardness is tested up to martensite phase hardness increased and when the austenite phase is started hardness of steel decreases so I think the answer is martensite.
Paro said:
10 years ago
Cementite is the hardest form of steel. So presence of cementite increases hardness.
Martensite is formed after heat treatment but cementite presence can be found out without heat treatment.
So in this condition cementite is correct answer.
Martensite is formed after heat treatment but cementite presence can be found out without heat treatment.
So in this condition cementite is correct answer.
Rushikesh Raval said:
10 years ago
Martensite is a crystalline structure while as cementite is intermetallic compound or constituent in the steel. As carbon % increase hardness increase.
Niwash said:
4 years ago
Cementite is the hardest structure on the iron carbon diagram, but the hardness of steel increases if it contains martensite.
Amit said:
9 years ago
I think the depth of hardening (in hardenability) martensite is an important factor, but in hardness cementite is necessary.
Thulasiraman said:
1 decade ago
We get Martensite after heat treatment only. But we need Cementite presence in the steel before doing HT.
Jyotish said:
1 decade ago
Martensite is the hardest form of steel. So I think the answer is [D] Martensite.
Naresh said:
1 decade ago
Which is the hardest face in steel Cementite or Martensite?
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