| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.1 ( September 1980 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Effects of Alloying Elements and Cooling Rate after Annealing on Mechanical Properties of Dual Phase Sheet Steel
Koichi Hashiguchi, Minoru Nishida, Toshiyuki Kato, Tomoo Tanaka |
| Synopsis : For the purpose of producing a highly formable dual phase steel by intercritical annealing, the effects of alloying elements and cooling rates on microstructure and properties have been studied. The effect of alloying elements on the critical cooling rate (CR) required for the formation of dual phase structure are representable equivalent manganese content (Mneq): log CR(/s)=-1.73Mneq(%)+3.95 Where Mneq(%)=Mn(%)+2.67Mo(%)+1.3Cr(%) When gas-cooled, a 1.2% Mn-0.5%Cr steel exhibits a low yield strength of 20kg/mm2 and a low yield-to-tensile strength ratio as low as 0.4. Without causing solid solution hardening and a decrease in dissolved C content in ferrite, Cr reduces the yield strength of ferrite, resulting in the lowering of the yield strength of dual phase structure. |
| TextiPDF: 9p./467kbj |