Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel
In this paper the effect of deep cryogenic treatment time on microstructure and tribological behavior of AISI 5120 case hardennig steel is studied. The disk shape samples were carburized at 920 ◦C for 6 hours and air cooled; after austenitizing, the samples were quenched in oil.Then immediately afte...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Isfahan University of Technology
2016-12-01
|
| Series: | Journal of Advanced Materials in Engineering |
| Subjects: | |
| Online Access: | http://jame.iut.ac.ir/article-1-856-en.html |
| _version_ | 1818725511544700928 |
|---|---|
| author | S. Torkian A. Shafyei M.R. Toroghinejad M. Safari |
| author_facet | S. Torkian A. Shafyei M.R. Toroghinejad M. Safari |
| author_sort | S. Torkian |
| collection | DOAJ |
| description | In this paper the effect of deep cryogenic treatment time on microstructure and tribological behavior of AISI 5120 case hardennig steel is studied. The disk shape samples were carburized at 920 ◦C for 6 hours and air cooled; after austenitizing, the samples were quenched in oil.Then immediately after quenching and sanding, the sample were kept in liquid nitrogen for 1, 24, 30 and 48 h and then tempered at 200 ◦C for 2 hours. The wear test was done by ball on disk method using of WC ball at 80 and 110 N load. For characterization of carbides, the etchant solution of CuCl2 (5 gr)+HCl (100 mL) + ethanol (100 mL) was used. The hardness of samples before and after of tempering was measured by vicers method at 300 N load.. The amount of retained austenite was measured by X Ray Diffraction method. For 1DCT and 24DCT samples it was about 8% and 4%; in the other samples, the retained austenite peal was so decreased that it was not visible. The result showed that the hardness increases by deep cryogenic treatment in all speciments. While wear resistance increases in 1DCT and 24DCT samples, it decreases for 30DCT and 48DCT samples in compare with Conventional heat treatment (CHT) sample in both applied loads, such that , 48DCT sample has the least wear resistance. The cause of increament of hardness is due to reduction in amount of retained austenite as a result of deep cryogenic treatment and decreasing in wear resistance after 24 hour, is due to carbide growth and nonhemogenuse distribution in microstructure and then weakening of matrix. So the 24 hour deep cryogenic treatment was the best optimal for AISI 5120 steel. |
| first_indexed | 2024-12-17T21:43:28Z |
| format | Article |
| id | doaj.art-09d0c9640ac74363afad844efc1f8714 |
| institution | Directory Open Access Journal |
| issn | 2251-600X 2423-5733 |
| language | fas |
| last_indexed | 2024-12-17T21:43:28Z |
| publishDate | 2016-12-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Advanced Materials in Engineering |
| spelling | doaj.art-09d0c9640ac74363afad844efc1f87142022-12-21T21:31:31ZfasIsfahan University of TechnologyJournal of Advanced Materials in Engineering2251-600X2423-57332016-12-013535767Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI SteelS. Torkian0A. Shafyei1M.R. Toroghinejad2M. Safari3 Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran In this paper the effect of deep cryogenic treatment time on microstructure and tribological behavior of AISI 5120 case hardennig steel is studied. The disk shape samples were carburized at 920 ◦C for 6 hours and air cooled; after austenitizing, the samples were quenched in oil.Then immediately after quenching and sanding, the sample were kept in liquid nitrogen for 1, 24, 30 and 48 h and then tempered at 200 ◦C for 2 hours. The wear test was done by ball on disk method using of WC ball at 80 and 110 N load. For characterization of carbides, the etchant solution of CuCl2 (5 gr)+HCl (100 mL) + ethanol (100 mL) was used. The hardness of samples before and after of tempering was measured by vicers method at 300 N load.. The amount of retained austenite was measured by X Ray Diffraction method. For 1DCT and 24DCT samples it was about 8% and 4%; in the other samples, the retained austenite peal was so decreased that it was not visible. The result showed that the hardness increases by deep cryogenic treatment in all speciments. While wear resistance increases in 1DCT and 24DCT samples, it decreases for 30DCT and 48DCT samples in compare with Conventional heat treatment (CHT) sample in both applied loads, such that , 48DCT sample has the least wear resistance. The cause of increament of hardness is due to reduction in amount of retained austenite as a result of deep cryogenic treatment and decreasing in wear resistance after 24 hour, is due to carbide growth and nonhemogenuse distribution in microstructure and then weakening of matrix. So the 24 hour deep cryogenic treatment was the best optimal for AISI 5120 steel.http://jame.iut.ac.ir/article-1-856-en.htmldeep cryogenic treatmentretained austenitehardnesswear resistancecarbide |
| spellingShingle | S. Torkian A. Shafyei M.R. Toroghinejad M. Safari Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel Journal of Advanced Materials in Engineering deep cryogenic treatment retained austenite hardness wear resistance carbide |
| title | Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel |
| title_full | Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel |
| title_fullStr | Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel |
| title_full_unstemmed | Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel |
| title_short | Effect of Deep Cryogenic Treatment on Hardness and Wear Behavior of 5120 AISI Steel |
| title_sort | effect of deep cryogenic treatment on hardness and wear behavior of 5120 aisi steel |
| topic | deep cryogenic treatment retained austenite hardness wear resistance carbide |
| url | http://jame.iut.ac.ir/article-1-856-en.html |
| work_keys_str_mv | AT storkian effectofdeepcryogenictreatmentonhardnessandwearbehaviorof5120aisisteel AT ashafyei effectofdeepcryogenictreatmentonhardnessandwearbehaviorof5120aisisteel AT mrtoroghinejad effectofdeepcryogenictreatmentonhardnessandwearbehaviorof5120aisisteel AT msafari effectofdeepcryogenictreatmentonhardnessandwearbehaviorof5120aisisteel |