Tensile Fracture Behavior On Temepred AISI 1040 Medium Carbon Steel
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 spe...
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| Format: | Monograph |
| Published: |
UTeM
2010
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| Online Access: | http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000063640 http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000063640 http://eprints.utem.edu.my/4324/1/Tensile_Fracture_Behavior_On_Tempered_AISI_1040_Medium_Carbon_Steel_-_24_pages.pdf http://eprints.utem.edu.my/4324/2/Tensile_Fracture_Behavior_On_Tempered_AISI_1040_Medium_Carbon_Steel_-_TA473_.N39_2010.pdf |
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| Summary: | 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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