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Consider the following statements about medium carbon steel:
1. It can be quench-hardened but not case-hardened.
2. It cannot be quench-hardened but case-hardening can be done.
3. It exhibits distinct yield point under tension test.
Which of the following statements given above are correct?
1. It can be quench-hardened but not case-hardened.
2. It cannot be quench-hardened but case-hardening can be done.
3. It exhibits distinct yield point under tension test.
Which of the following statements given above are correct?
- a)1 and 2
- b)2 and 3
- c)1 and 3
- d)1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements about medium carbon steel:1. It can ...
Low carbon steels (less than 0.3%C) cannot be quench hardened but case hardening can be done.
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Consider the following statements about medium carbon steel:1. It can ...
Statement 1: Medium carbon steel can be quench-hardened but not case-hardened.
Quench-hardening is a heat treatment process in which steel is heated to a high temperature and then rapidly cooled (quenched) in a liquid medium, typically oil or water. This process results in a hardened structure with increased strength and hardness. Medium carbon steel, typically containing around 0.3-0.6% carbon, can undergo quench-hardening. The high carbon content allows for the formation of a hard martensitic structure during the quenching process.
On the other hand, case-hardening is a heat treatment process used to increase the hardness of the outer surface of a steel component while retaining a relatively tough and ductile core. This is achieved by introducing carbon or nitrogen into the surface layer of the steel through a diffusion process. Medium carbon steel is not suitable for case-hardening as it already contains a sufficient amount of carbon to achieve the desired hardness through quench-hardening. Therefore, statement 1 is correct.
Statement 2: Medium carbon steel cannot be quench-hardened but case-hardening can be done.
This statement is incorrect. As mentioned earlier, medium carbon steel can be quench-hardened by heating it to a high temperature and then rapidly cooling it. Case-hardening, however, is not suitable for medium carbon steel.
Statement 3: Medium carbon steel exhibits a distinct yield point under tension test.
The yield point is the stress level at which a material begins to deform plastically, meaning it does not return to its original shape after the applied stress is removed. Medium carbon steel, like most steels, typically exhibits a distinct yield point during a tension test. This yield point is characterized by a sudden drop in stress after which the material undergoes plastic deformation. Therefore, statement 3 is correct.
In conclusion, statements 1 and 3 are correct. Medium carbon steel can be quench-hardened and exhibits a distinct yield point under tension test. Statement 2 is incorrect as medium carbon steel is not suitable for case-hardening. Therefore, the correct answer is option C.
Quench-hardening is a heat treatment process in which steel is heated to a high temperature and then rapidly cooled (quenched) in a liquid medium, typically oil or water. This process results in a hardened structure with increased strength and hardness. Medium carbon steel, typically containing around 0.3-0.6% carbon, can undergo quench-hardening. The high carbon content allows for the formation of a hard martensitic structure during the quenching process.
On the other hand, case-hardening is a heat treatment process used to increase the hardness of the outer surface of a steel component while retaining a relatively tough and ductile core. This is achieved by introducing carbon or nitrogen into the surface layer of the steel through a diffusion process. Medium carbon steel is not suitable for case-hardening as it already contains a sufficient amount of carbon to achieve the desired hardness through quench-hardening. Therefore, statement 1 is correct.
Statement 2: Medium carbon steel cannot be quench-hardened but case-hardening can be done.
This statement is incorrect. As mentioned earlier, medium carbon steel can be quench-hardened by heating it to a high temperature and then rapidly cooling it. Case-hardening, however, is not suitable for medium carbon steel.
Statement 3: Medium carbon steel exhibits a distinct yield point under tension test.
The yield point is the stress level at which a material begins to deform plastically, meaning it does not return to its original shape after the applied stress is removed. Medium carbon steel, like most steels, typically exhibits a distinct yield point during a tension test. This yield point is characterized by a sudden drop in stress after which the material undergoes plastic deformation. Therefore, statement 3 is correct.
In conclusion, statements 1 and 3 are correct. Medium carbon steel can be quench-hardened and exhibits a distinct yield point under tension test. Statement 2 is incorrect as medium carbon steel is not suitable for case-hardening. Therefore, the correct answer is option C.
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Consider the following statements about medium carbon steel:1. It can be quench-hardened but not case-hardened.2. It cannot be quench-hardened but case-hardening can be done.3. It exhibits distinct yield point under tension test.Which of the following statements given above are correct?a)1 and 2b)2 and 3c)1 and 3d)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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