Abstract

Mechanical failure of component parts as well as in build up structures can be prevented if proper quality control is carried out at point of component’s manufacture. Engineers are known to analyze samples from which accurate predictions are made about the properties of the materials that are produced for the purpose of component and structural processing. This work had produced and tested heat treated 1030 steel by pulling them in tensometer to fracture. The tensometer was connected to a computer which plotted graphs from which data of true stress and strain were analyzed for the various heat treated specimens. The analysis of data was done using none regression analysis, SPSS soft ware, to obtain the materials related properties for each of the specimen. The yield strength (s_y) and ultimate tensile strength (s_u) of the specimens were significantly different. The highest and lowest s_ywas annealed specimen 450 MPa and normalized specimen 220 MPa respectively. The highest and lowest s_u was hardened specimen 608 MPa and normalized specimen 320 MPa respectively. With a strain-rate sensitivity C of 0.0562, normalized specimen was less ductile than hardened specimen which had a C value of 0.0083. By the analysis, normalized and tempered specimen which had the strain hardening parameter n of 0.1270 and 0.1240 respectively were less ductile than hardened and annealed specimens with n values of 0.0439 and 0.0571 respectively.

Key words: Yield strength, ultimate tensile strength, 1030 steel.