STUDY ON THE HOT-DUCTILITY OF STEELS (I)

Study on the Hot Twist Test

Abstract

As a method to evaluate hot-ductility of steels, hot twist test was adopted and study on its test was performed.
The design and construction of the testing apparatus, procedure of test and the form of test specimens were described.
Some tests were carried out to confirm the reproducibility, accuracy of test results and availability of this test.
In these tests, the following results were obtained.
(1) The apparatus used showed fairly good reproducibility and accuracy of test results.
(2) This test was proved to be more useful and sensitive to evaluating hot-ductility of steels as compared with other tests such as high temperature tensile or impact test.
Also in this study, the effect of MnS inclusions on hot-ductility of steels was examined.
In addition, by means of this test, some experiments were performed on the hot-ductility of various carbon and alloy steels.