Question:
Which of the following statements is/are CORRECT when Ni is added as an alloying element to a low alloy steel?
Which of the following statements is/are CORRECT when Ni is added as an alloying element to a low alloy steel?
Show Hint
Nickel is an important alloying element that improves the hardenability of steel by lowering the \( M_s \) temperature. This allows the steel to be hardened more deeply when quenched.
Updated On: Apr 29, 2025
- Hardenability is increased AND the \( M_s \) temperature is lowered.
- Hardenability is decreased AND the \( M_s \) temperature is lowered.
- Hardenability is increased AND the \( M_s \) temperature is raised.
- Hardenability is decreased AND the \( M_s \) temperature is raised.
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Nickel (Ni) is commonly used as an alloying element in steel to improve hardenability. Hardenability refers to the ability of steel to form martensite when quenched. Nickel increases hardenability by slowing down the transformation from austenite to pearlite or bainite, allowing for a deeper hardening depth. Additionally, Ni lowers the \( M_s \) temperature, which is the temperature at which martensite starts to form. This results in a more favorable condition for forming martensite at lower temperatures.
Thus, the correct statement is that Hardenability is increased and the \( M_s \) temperature is lowered. Therefore, Option A is correct.
Step 1: Analyzing each option - Option (A): Hardenability is increased AND the \( M_s \) temperature is lowered. - Correct: Ni increases hardenability and lowers the \( M_s \) temperature, making this statement accurate.
- Option (B): Hardenability is decreased AND the \( M_s \) temperature is lowered. - Incorrect: Ni increases hardenability, not decreases it. Hence, this option is incorrect.
- Option (C): Hardenability is increased AND the \( M_s \) temperature is raised. - Incorrect: Although Ni increases hardenability, it actually lowers the \( M_s \) temperature, not raises it.
- Option (D): Hardenability is decreased AND the \( M_s \) temperature is raised. - Incorrect: Ni does not decrease hardenability, and it does not raise the \( M_s \) temperature.
Step 2: Conclusion The correct answer is Option A.
Step 1: Analyzing each option - Option (A): Hardenability is increased AND the \( M_s \) temperature is lowered. - Correct: Ni increases hardenability and lowers the \( M_s \) temperature, making this statement accurate.
- Option (B): Hardenability is decreased AND the \( M_s \) temperature is lowered. - Incorrect: Ni increases hardenability, not decreases it. Hence, this option is incorrect.
- Option (C): Hardenability is increased AND the \( M_s \) temperature is raised. - Incorrect: Although Ni increases hardenability, it actually lowers the \( M_s \) temperature, not raises it.
- Option (D): Hardenability is decreased AND the \( M_s \) temperature is raised. - Incorrect: Ni does not decrease hardenability, and it does not raise the \( M_s \) temperature.
Step 2: Conclusion The correct answer is Option A.
Was this answer helpful?
0
0
Top Questions on Transition Metals
- Which of the following statements is/are correct when Ni is added as an alloying element to a low alloy steel?
- GATE MT - 2025
- Metallurgical Engineering
- Transition Metals
- Which of the following transition metals has the highest melting point?
- CBSE CLASS XII - 2025
- Chemistry
- Transition Metals
- Answer the following about the complex \([Ti(H_2O)_6]^{3+}\):
(i) What happens to the colour of complex \([Ti(H_2O)_6]^{3+}\) when heated gradually?
(ii) Write the electronic configuration for \(d^5\) ion if \(\Delta_0<P\).
(iii) Write the hybridization and magnetic behaviour of the complex \([Ni(CO)_4]\).- CBSE CLASS XII - 2025
- Chemistry
- Transition Metals
- Which of the following does not show variable oxidation state?
- CBSE CLASS XII - 2025
- Chemistry
- Transition Metals
- In 3d series, a metal ‘X’ has highest second ionisation enthalpy. The spin only magnetic moment (in BM) of X$^{2+}$ ion is
- AP EAPCET - 2025
- Chemistry
- Transition Metals
View More Questions
Questions Asked in GATE MT exam
- If \( P e^x = Q e^{-x} \) for all real values of \( x \), which one of the following statements is true?
Bird : Nest :: Bee : __________
Select the correct option to complete the analogy.- Two consecutive estimates of the root of a function $f(x)$ obtained using the Newton-Raphson method are $x_i = 8.5$ and $x_{i+1 = 13.5$, and the value of the function at $x_i$ is 15. The numerical value of the first derivative of the function evaluated at $x_i$ is ............ (in integer).}
- GATE MT - 2025
- Calculus
- A cylindrical Al alloy billet of 300 mm diameter is hot extruded to produce a cylindrical rod of 75 mm diameter at a constant true strain rate of 10 s$^{-1$. The flow stress of the alloy at the extrusion temperature is given by $\sigma = 10 \, (\dot{\epsilon})^{0.3}$ MPa. Assume the alloy is perfectly plastic and there is no temperature rise during the extrusion process. The ideal plastic work of deformation per unit volume is ............ × 10$^6$ J m$^{-3}$ (rounded off to one decimal place).}
- GATE MT - 2025
- Metallurgical
- Temperatures at two sides of a 0.4 m thick copper plate are 1000 and 500 °C. Assuming steady state, one-dimensional conductive heat transfer through the wall and ignoring end-effects, the magnitude of the heat flux through the wall is ............... × 10$^5$ W m$^{-2$ (in integer).} Given: Thermal conductivity of copper = 400 W m$^{-1}$ K$^{-1}$
- GATE MT - 2025
- Thermodynamics
View More Questions