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.
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.
Rajkotha said:
4 years ago
Martensite is the right option.
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)
Sumit kumar said:
7 years ago
Martensite is unstable.
Eswarsai said:
7 years ago
Please confirm the answer? Is Martensite or is cementite.
Mechio said:
7 years ago
(D) Martensite is the correct answer.
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).
ShivaRanjith said:
9 years ago
It should be Martensite.
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.
Amit said:
9 years ago
I think the depth of hardening (in hardenability) martensite is an important factor, but in hardness cementite is necessary.
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