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Consider the following statements in respect of austenitic stainless steels:1. Austenitic stainless steels are hardened and strengthened by cold working.
2. Austenitic stainless steels cannot be quenched and tempered.
Which of the statements given above is/are correct?
2. Austenitic stainless steels cannot be quenched and tempered.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements in respect of austenitic stainless s...
Ans. (c)
• Austenitic stainless steels usually contain 18% Cr and 8% Ni in addition to other minor alloying elements. Ni stabilizes the austenitic phase assisted by C and N. Other alloying additions include Ti, Nb, Mo (prevent weld decay), Mn and Cu (helps in stabilizing austenite).
• These steels are very tough and can be forged and rolled but offer great difficulty in machining.
• These steels cannot be hardened by quenching, in fact they are softened by rapid cooling from about 1000°C.
• Austenitic stainless steels usually contain 18% Cr and 8% Ni in addition to other minor alloying elements. Ni stabilizes the austenitic phase assisted by C and N. Other alloying additions include Ti, Nb, Mo (prevent weld decay), Mn and Cu (helps in stabilizing austenite).
• These steels are very tough and can be forged and rolled but offer great difficulty in machining.
• These steels cannot be hardened by quenching, in fact they are softened by rapid cooling from about 1000°C.
Most Upvoted Answer
Consider the following statements in respect of austenitic stainless s...
Austenitic stainless steels are a type of stainless steel alloy that contains a high amount of chromium and nickel. They are known for their excellent corrosion resistance, high ductility, and good mechanical properties. Let's analyze each statement given in the question to determine their correctness.
1. Austenitic stainless steels are hardened and strengthened by cold working:
- This statement is correct. Austenitic stainless steels can be hardened and strengthened by cold working processes such as cold rolling, cold drawing, or cold forging. Cold working involves deforming the material at room temperature, which introduces dislocations and strain into the crystal structure of the steel. These dislocations hinder the movement of atoms and increase the strength and hardness of the material. Cold working also improves the yield strength, tensile strength, and fatigue resistance of austenitic stainless steels.
2. Austenitic stainless steels cannot be quenched and tempered:
- This statement is incorrect. Quenching and tempering is a heat treatment process used to enhance the mechanical properties of steel. While it is true that austenitic stainless steels are not typically hardened by quenching and tempering like martensitic or precipitation-hardening stainless steels, they can still undergo this process to improve certain properties. For example, some grades of austenitic stainless steels can be solution annealed (heated to a high temperature and then rapidly cooled) to dissolve any carbides or precipitates present in the material. After solution annealing, the steel can be quenched and then tempered to increase its strength or hardness.
In summary, statement 1 is correct because austenitic stainless steels can be hardened and strengthened by cold working. Statement 2 is incorrect because austenitic stainless steels can be quenched and tempered, although it is not the primary method of hardening them. Therefore, the correct answer is option C, both statements 1 and 2 are correct.
1. Austenitic stainless steels are hardened and strengthened by cold working:
- This statement is correct. Austenitic stainless steels can be hardened and strengthened by cold working processes such as cold rolling, cold drawing, or cold forging. Cold working involves deforming the material at room temperature, which introduces dislocations and strain into the crystal structure of the steel. These dislocations hinder the movement of atoms and increase the strength and hardness of the material. Cold working also improves the yield strength, tensile strength, and fatigue resistance of austenitic stainless steels.
2. Austenitic stainless steels cannot be quenched and tempered:
- This statement is incorrect. Quenching and tempering is a heat treatment process used to enhance the mechanical properties of steel. While it is true that austenitic stainless steels are not typically hardened by quenching and tempering like martensitic or precipitation-hardening stainless steels, they can still undergo this process to improve certain properties. For example, some grades of austenitic stainless steels can be solution annealed (heated to a high temperature and then rapidly cooled) to dissolve any carbides or precipitates present in the material. After solution annealing, the steel can be quenched and then tempered to increase its strength or hardness.
In summary, statement 1 is correct because austenitic stainless steels can be hardened and strengthened by cold working. Statement 2 is incorrect because austenitic stainless steels can be quenched and tempered, although it is not the primary method of hardening them. Therefore, the correct answer is option C, both statements 1 and 2 are correct.
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Consider the following statements in respect of austenitic stainless steels:1. Austenitic stainless steels are hardened and strengthened by cold working.2. Austenitic stainless steels cannot be quenched and tempered.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'C'. Can you explain this answer?
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