Question:
Alloying element that does not shifts TTT curve towards right side is
Alloying element that does not shifts TTT curve towards right side is
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Most metallic alloys (Cr, Ni, Mo) move the TTT curve right to make quenching easier.
Updated On: Jul 4, 2026
- Nickle
- Chromium
- Molybdenum
- Carbon
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The Correct Option is D
Solution and Explanation
Step 1: Concept The Time-Temperature-Transformation (TTT) curve represents the kinetics of isothermal transformation of austenite.
Step 2: Meaning Shifting the curve to the right increases "hardenability" by delaying the start of transformation, allowing for slower cooling rates to form martensite.
Step 3: Analysis Metallic alloying elements like Nickel, Chromium, and Molybdenum significantly delay transformation by slowing down diffusion. While carbon affects the positions of $M_{s}$ and $M_{f}$ temperatures, it is the primary constituent of the phases rather than a retarding alloy addition in the same sense as metallic elements.
Step 4: Conclusion Among the choices provided in the context of shifting the "nose" of the curve, carbon is the outlier compared to metallic alloying elements. Final Answer: (D)
Step 2: Meaning Shifting the curve to the right increases "hardenability" by delaying the start of transformation, allowing for slower cooling rates to form martensite.
Step 3: Analysis Metallic alloying elements like Nickel, Chromium, and Molybdenum significantly delay transformation by slowing down diffusion. While carbon affects the positions of $M_{s}$ and $M_{f}$ temperatures, it is the primary constituent of the phases rather than a retarding alloy addition in the same sense as metallic elements.
Step 4: Conclusion Among the choices provided in the context of shifting the "nose" of the curve, carbon is the outlier compared to metallic alloying elements. Final Answer: (D)
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