Question

Which of the following formulas is given by Chvorinov’s rule for the estimation of total solidification time (ts)?

(a) ts = B/(V/A)^n

(b) ts = B*(A/V)^n

(c) ts = B*(V/A)^n

(d) ts = B/(A/V)^n

The question was asked during an online interview.

My doubt is from Solidification of a Large Casting in an Insulating Mould in chapter Cooling and Solidification of Casting-Forming-Welding I

Answer 1

Right answer is (c) ts = B*(V/A)^n

Explanation: According to Chvorinov’s rule, the total solidification time (ts) is the time from pouring to the completion of solidification which can be computed by: ts = B*(V/A)^n, where n = 1.5 to 2.0; V is the volume of the casting; B is the mould constant; and A is the surface area, which depends on the characteristics of the metal being casted.