there are 2 questions please

Which mechanism(s) cause(s) an increase in the strength of medium-carbon steels? decreasing the grain size B strain hardening heat treatment to provide martensitic microstructure All 2 Puan Soru 5 Which of the following statements is correct about the electron band structure of materials? metals exhibit large band gaps. B insulator materials have a very small band gap. in metals, empty band and the filled band are overlapped