TMMOB Metalurji ve Malzeme Mühendisleri Odas ı E ğ itim Merkezi Bildiriler Kitab ı 877 19. Uluslararas ı Metalurji ve Malzeme Kongresi | IMMC 2018 Demiryolu Bağlantılarında Gergi Kıskacı Olarak Kullanılan 38Si7 Çelik Kangal Kalitesinde Isıl İşlem Prosesi Sonrası Oluşan Heterojen Sertliğin Giderilmesi • Removal of Heterogeneous Hardness After Heat Treatment Process of 38Si7 Steel Wire Rod Grade for Tension Clamps in Railway Fastening Systems Serdar Günbay¹, Erhan Sakallı², Hamdi Gül¹, Ahmet Sağlam¹ ¹İskenderun Demir ve Çelik A.Ş. Payas/HATAY, Türkiye ²Ereğli Demir ve Çelik Fabrikaları T.A.Ş. Ereğli/ZONGULDAK, Türkiye Abstract In this study, it was aimed to removal of heterogeneous hardness after heat treatment process of 38Si7 steel wire rod for tension clamps in railway fastening systems, conforming mechanical properties, microstructure and optimum hardness values. In early studies, it was evaluated that the root cause of heterogeneous hardness problem is ferrite banding. In this context , CCT / TTT diagrams were acquired by using JMatPro software, transformation temperatures were determined and stelmor process simulations were performed with Gleeble 3500 thermo-mechanical simulator and effect of this study on the microstructure were experimentally investigated. With the obtained findings, industrial applications were made in homogeneous cooling with constant cooling rate of about ucture results were examined after trial productions. The aimed mechanical properties were provided at all laying head temperatures and also it was determined that grain sizes were inversely proportional to laying head temperature according to ASTM E112-13. It has been determined that the laying head temperature does not have ferrite banding Wire rods without ferrite banding provided homogeneous hardness in customer process, that satisfy the customer demands. olup bu belirlenmi s - . DIN EN 10089 38Si7 kalitesi mikro - yay halat olarak nitelendirilmekle . e , -
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Demiryolu Bağlantılarında Gergi Kıskacı Olarak Kullanılan ... · ¹İskenderun Demir ve Çelik A.Ş. Payas/HATAY, Türkiye ²Ereğli Demir ve Çelik Fabrikaları T.A.Ş. Ereğli/ZONGULDAK,
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TMMOB Metalurj i ve Malzeme Mühendisleri Odas ı Eğ i t im MerkeziBildir i ler Kitab ı
87719. Uluslararas ı Metalurj i ve Malzeme Kongresi | IMMC 2018
Demiryolu Bağlantılarında Gergi Kıskacı Olarak Kullanılan 38Si7 Çelik Kangal Kalitesinde Isıl İşlem Prosesi Sonrası Oluşan Heterojen Sertliğin Giderilmesi
•Removal of Heterogeneous Hardness After Heat Treatment Process of 38Si7 Steel Wire Rod Grade for
Tension Clamps in Railway Fastening SystemsSerdar Günbay¹, Erhan Sakallı², Hamdi Gül¹, Ahmet Sağlam¹
¹İskenderun Demir ve Çelik A.Ş. Payas/HATAY, Türkiye²Ereğli Demir ve Çelik Fabrikaları T.A.Ş. Ereğli/ZONGULDAK, Türkiye
Abstract
In this study, it was aimed to removal of heterogeneous hardness after heat treatment process of 38Si7 steel wire rod for tension clamps in railway fastening systems, conforming mechanical properties, microstructure and optimum hardness values. In early studies, it was evaluated that the root cause of heterogeneous hardness problem is ferrite banding. In this context , CCT / TTT diagrams were acquired by using JMatPro software, transformation temperatures were determined and stelmor process simulations were performed with Gleeble 3500 thermo-mechanical simulator and effect of this study on the microstructure were experimentally investigated. With the obtained findings, industrial applications were made in homogeneous cooling with constant cooling rate of about
ucture results were examined after trial productions. The aimed mechanical properties were provided at all laying head temperatures and also it was determined that grain sizes were inversely proportional to laying head temperature according to ASTM E112-13. It has been determined that the laying head temperature does not have ferrite banding
Wire rods without ferrite banding provided homogeneous hardness in customer process, that satisfy the customer demands.
olup bu
belirlenmi
s
-
.
DIN EN 10089 38Si7 kalitesi mikro - yay halat
olarak nitelendirilmekle
.e
, -
UCTEA Chamber of Metallurgical & Materials Engineers’s Training Center Proceedings Book
878 IMMC 2018 | 19th International Metallurgy & Materials Congress
Kangal haddehanesi9 tezgah sonr -45 mm
18 ndirilir. Finish grubunda dikey ve yatay 10 tezgah bulunmakta olup, finish grubunun ilk 3- -indirgenen kangal utma so utularak ile serme kafadan
,sebebi olarak ferrit bant
. (Ar3)
830 olan Ar3
.
2.
verilen kimyasal kompozisyona uygun olarak JMatPro
.
Kangal haddehanesinde belirlenen parametrelerine benzer kimyasal ve hadde parametreleri