Tensile Fracture Behavior On Temepred AISI 1040 Medium Carbon Steel

Nazarail, Ab Majid (2010) Tensile Fracture Behavior On Temepred AISI 1040 Medium Carbon Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This study includes the effects of tempering heat treated AISI I 040 medium carbon steel against fracture behavior based on the resulting changes of microstructure. Besides of that, tempering temperature changes were relates with the fracture behavior heat treated specimens. Size and shape of specimens used are based on ASTM E8 - 04 specifications. During austenitizing, specimen was heated at 870° C and holding it at this temperature for 30 minutes. Specimen will be cooling rapidly by quenching in oil and tempering the steel by reheating it to various tempering temperature with temperature range 300° C - 700 ° C. Tempering time is fixed for 60 minutes while tempering temperature is varied followed by normal cooling to room temperature. Tensile tests were performed on tempered specimens by using Universal Testing Machine to determine the fracture behavior. Tensile test result shows fracture strength of tempered specimen was 1213Mpa at lower tempering temperature, 300° C while fracture strength of tempered specimen was 459Mpa at higher tempering temperature, 700° C. Fracture surface characteristic at lower tempering temperature was brittle where surfaces were flat. On the other hand, fracture surface characteristic at higher tempering temperature was ductile where surfaces were rough and have the shape cup and cone. This shows the tempered specimens became more ductile fracture in tandem with increasing tempering temperature. Microstructure analysis is also done to see the microstructure changes at different tempering temperatures. An observation of microstructure is made by using Axioskop 2 MAT. Microstructure analysis carried out after tempering process shows microstructure of tempered specimens consists of alpha, a - ferrite and cementite, Fe3C. Continued tempering with increasing tempering temperature will return the AISI 1040 medium carbon steel to almost fully ferritic structure and highly ductility.

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