Investigation on compressive strength of a low alloy steel (AISI4140) and plain carbon steel - a novel statistical approach

Abstract

The prime objective of this work is to investigate the compressive strength of low alloy steel (AISI4140) and compare it with that of plain carbon steel. As cast low alloy steel (AISI4140) and plain carbon steel were considered for this investigation. ClinCalc tool was used to calculate the samples, accordingly 20 samples per group were prepared as per ASTM standards. A CNC laser cutting machine is used for the preparation of specimens as per ASTM standards (E8). By using universal testing machines (UTM) the compressive properties were performed and observed for both groups. According to independent T-test and descriptive statistical analysis, it is observed that there exists a significant (with a significance value of 0.001, i.e., P < 0.05) difference in the compressive strength between low alloy steel (AISI4140) and plain carbon steel. From the compression testing results plain carbon steel shows an average of 13.657 MPa, whereas low alloy steel (AISI4140) exhibits an average compressive strength of 43.564 MPa. Within the limitations of the study, it is found that low alloy steel (AISI4140) has good compression strength when compared to plain carbon steel.