Question

To achieve useful strength of the material at temperatures of 1000-1600 ⁰C, what should be the melting point temperature of the material?

(a) 1000 ⁰C

(b) 1300 ⁰C

(c) 1600 ⁰C

(d) More than 1600 ⁰C

This question was addressed to me in semester exam.

Enquiry is from Directional Solidification in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

The correct option is (d) More than 1600 ⁰C

Best explanation: To achieve useful strengths at the temperatures of 1000-1600 ⁰C, melting points in excess of 1600 ⁰C are required. Most of the materials retain significant strength to approximately 0.5-0.6 of their absolute melting temperature, but for high strength, high melting point temperature is preferred.