We find that while testing samples of hot rolled mild steel sheets the value of yield strength is dependent on the rate of stress applied. We have conducted trials in the range of 6 to 30 N/mm2 sec(-1) on samples of cross-sectional area of about 75 mm2 (3mm thick). The yield strength values of...
Identically Deep drawn and welded cups, made from hot rolled steel sheets of same cast are divided into two equal lots. One lot is stress relieved or normalised immediately and the other say after a year. Would there be a difference in the micro-grain structure of the parent metal of the two...
