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Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'B'. Can you explain this answer?
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Assertion (A): The characteristic feature of High speed Steel is its r...
Assertion (A): The characteristic feature of High speed Steel is its red hardness.
Reason (R): Chromium and cobalt in High Speed promote martensite formation when the tool is cold worked.
Explanation:
- High-Speed Steel (HSS) is a type of tool steel that is specifically designed for high-speed applications such as cutting tools, drills, milling cutters, and taps.
- The characteristic feature of HSS is its ability to maintain its hardness at high temperatures, which is known as red hardness.
- Red hardness refers to the hardness of a material at elevated temperatures, typically above 600°C.
- The red hardness of HSS is essential for its performance in high-speed cutting operations, where the tool is subjected to high temperatures due to friction and cutting forces.
- The primary alloying elements in HSS that contribute to its red hardness are chromium (Cr) and tungsten (W).
- Chromium forms carbides in HSS, which enhance the hardness and wear resistance of the material. Cobalt (Co) is another alloying element that is often added to HSS to improve its hot hardness and toughness.
- When the HSS tool is cold worked, such as during the manufacturing process or during machining operations, it undergoes plastic deformation. This plastic deformation promotes the formation of martensite, a hard and brittle phase in the microstructure of steel.
- The presence of chromium and cobalt in HSS promotes the formation of martensite during cold working, which further enhances the hardness of the material.
- Therefore, the reason (R) is a correct explanation for the characteristic feature of HSS, which is its red hardness.
- Both assertion (A) and reason (R) are individually true, and reason (R) is the correct explanation of assertion (A).
Conclusion:
Both assertion (A) and reason (R) are individually true, and reason (R) is the correct explanation of assertion (A).
Reason (R): Chromium and cobalt in High Speed promote martensite formation when the tool is cold worked.
Explanation:
- High-Speed Steel (HSS) is a type of tool steel that is specifically designed for high-speed applications such as cutting tools, drills, milling cutters, and taps.
- The characteristic feature of HSS is its ability to maintain its hardness at high temperatures, which is known as red hardness.
- Red hardness refers to the hardness of a material at elevated temperatures, typically above 600°C.
- The red hardness of HSS is essential for its performance in high-speed cutting operations, where the tool is subjected to high temperatures due to friction and cutting forces.
- The primary alloying elements in HSS that contribute to its red hardness are chromium (Cr) and tungsten (W).
- Chromium forms carbides in HSS, which enhance the hardness and wear resistance of the material. Cobalt (Co) is another alloying element that is often added to HSS to improve its hot hardness and toughness.
- When the HSS tool is cold worked, such as during the manufacturing process or during machining operations, it undergoes plastic deformation. This plastic deformation promotes the formation of martensite, a hard and brittle phase in the microstructure of steel.
- The presence of chromium and cobalt in HSS promotes the formation of martensite during cold working, which further enhances the hardness of the material.
- Therefore, the reason (R) is a correct explanation for the characteristic feature of HSS, which is its red hardness.
- Both assertion (A) and reason (R) are individually true, and reason (R) is the correct explanation of assertion (A).
Conclusion:
Both assertion (A) and reason (R) are individually true, and reason (R) is the correct explanation of assertion (A).
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Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer?
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Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer?.
Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer?.
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ample number of questions to practice Assertion (A): The characteristic feature of High speed Steel is its red hardness.Reason (R): Chromium and cobalt in High Speed promote martensite formationwhen the tool is cold worked.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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