Effect of Deep Cryogenic Heat Treatment to Some Mechanical Properties of Bimetals

Zafer Özdemir

Article Details

Effect of Deep Cryogenic Heat Treatment to Some Mechanical Properties of Bimetals

Authors:

Zafer Özdemir

Publisher:

Fırat University

Main Topics:

Malzeme Tasarım ve Davranışları

Journal:

Fırat Üniversitesi Mühendislik Bilimleri Dergisi Vol.36 Issue 1, pp.281-289

Document Type:

Article

Publication Date:

3/2024

Document Language:

Turkish

Document ID (Org No.):

2001302434

pISSN:

1308-9072

Keywords:

Abstract:

 Deep cryogenic subzero treatment DCT is at great importance when high toughness and hardness is aimed to obtain in metal industry. Bimetals have a great importance in crushing industry also. DCT influence on the mechanical properties of bimetals have been examined and analyzed in the current study. Examinations include annealing at 800C, DCT, tempering at 250C, charpy impact test, optic microscope OM images analysis, scanning electron microscope images analysis, X-RAY images analysis and hardness measurement as Rockwell C. Bimetals 2 set each, 1 set is 5 sample are put to annealing at 800C for 5 hours, then DCT is conducted at -180C for 24 hours. Tempering is followed out at 250C for 3 hours for 1 set. Noteworthy hardness and toughness rates are observed after DCT. It was also observed that after DCT and tempering, hardness is reduced, but impact energytoughness is increased. A clean microstructure has been observed after DCT in OMs and SEMs. X-RAY analysis also reveals pure and clean chemical composition. The impact toughness rates of samples after DCTTempering are determined 20 more compared with the rates after DCT. Hardness rates decreases 10 after DCTTempering compared with the rates after DCT.

 Deep cryogenic subzero treatment DCT is at great importance when high toughness and hardness is aimed to obtain in metal industry. Bimetals have a great importance in crushing industry also. DCT influence on the mechanical properties of bimetals have been examined and analyzed in the current study. Examinations include annealing at 800C, DCT, tempering at 250C, charpy impact test, optic microscope OM images analysis, scanning electron microscope images analysis, X-RAY images analysis and hardness measurement as Rockwell C. Bimetals 2 set each, 1 set is 5 sample are put to annealing at 800C for 5 hours, then DCT is conducted at -180C for 24 hours. Tempering is followed out at 250C for 3 hours for 1 set. Noteworthy hardness and toughness rates are observed after DCT. It was also observed that after DCT and tempering, hardness is reduced, but impact energytoughness is increased. A clean microstructure has been observed after DCT in OMs and SEMs. X-RAY analysis also reveals pure and clean chemical composition. The impact toughness rates of samples after DCTTempering are determined 20 more compared with the rates after DCT. Hardness rates decreases 10 after DCTTempering compared with the rates after DCT.

 Deep cryogenic subzero treatment DCT is at great importance when high toughness and hardness is aimed to obtain in metal industry. Bimetals have a great importance in crushing industry also. DCT influence on the mechanical properties of bimetals have been examined and analyzed in the current study. Examinations include annealing at 800C, DCT, tempering at 250C, charpy impact test, optic microscope OM images analysis, scanning electron microscope images analysis, X-RAY images analysis and hardness measurement as Rockwell C. Bimetals 2 set each, 1 set is 5 sample are put to annealing at 800C for 5 hours, then DCT is conducted at -180C for 24 hours. Tempering is followed out at 250C for 3 hours for 1 set. Noteworthy hardness and toughness rates are observed after DCT. It was also observed that after DCT and tempering, hardness is reduced, but impact energytoughness is increased. A clean microstructure has been observed after DCT in OMs and SEMs. X-RAY analysis also reveals pure and clean chemical composition. The impact toughness rates of samples after DCTTempering are determined 20 more compared with the rates after DCT. Hardness rates decreases 10 after DCTTempering compared with the rates after DCT.

 Bu çalışmada kırıcı sanayiinde kullanılan bimetallerin mekanik özelliklerine derin sıfır altı-kriyojenik işlemin DKİ etkisi incelenmiştir. Son yıllarda yüksek sertliğin yanısıra yüksek tokluk ihtiyacının da olduğu darbeli kırıcılarda bimetal kompozitler yüksek manganlı östenitik çeliklerin yerine yaygın olarak kullanılmaya başlanmıştır. Konvensiyonel ısıl işlem bimetallerde uygulanmakla beraber, çalışmamızda sıfıraltı işlemin malzemenin belirli mekanik özelliklerine etkisi ve içyapı analizi de incelenmiştir. İnceleme 800C de tavlama, -180C de derin sıfır altı işlem 250C de temperleme, charpy darbe testi, optik mikroskop analizi, tarayıcı elektron mikroskop analizi, X-Ray analizini ve sertlik ölçümlerini içermektedir. Her sette 5 adet deney numunesi olmak üzere 2şer set bimetal malzeme önce 5 saat süre ile tavlama işlemine tabii tutulmuş, ardından 24 saat sıfır altı işleme ve 3-4 saat süre ile de temperleme işlemine tabii tutulmuştur. Darbe tokluk deneyleri ve sertlik ölçümleri yapılarak karşılaştırılmıştır. Sonuç olarak derin sıfır altı işlem sonrası tokluk ve sertlik değerlerinde önemli değişimlerin ortaya çıktığı görülmekte olup, aynı zamanda temiz bir içyapı ve homojen bir bileşimin ortaya çıktığı gözlemlenmiştir. Derin Sıfıraltı İşlemTemperleme sonrası numunelerin darbe tokluğunun sadece Derin Sıfıraltı İşlemi sonrasına kıyasla ortalama 20 arttığı ve sertlik oranlarının ise 10 azaldığı gözlemlenmiştir.

Article Details

Effect of Deep Cryogenic Heat Treatment to Some Mechanical Properties of Bimetals

Authors:

Zafer Özdemir

Publisher:

Fırat University

Main Topics:

Malzeme Tasarım ve Davranışları

Journal:

Fırat Üniversitesi Mühendislik Bilimleri Dergisi Vol.36 Issue 1, pp.281-289

Document Type:

Article

Publication Date:

3/2024

Document Language:

Turkish

Document ID (Org No.):

2001302434

pISSN:

1308-9072

Subzero cryogenic treatment

bimetal

impact test

high alloy cast iron

low alloy steelKriyojenik sıfıraltı işlem

bimetal

çentik darbe testi

yüksek alaşımlı krom dökme demir

düşük alaşımlı çelik

Issues

Article Details

Authors: Zafer Özdemir

Publisher: Fırat University

Main Topics: Malzeme Tasarım ve Davranışları

Journal: Fırat Üniversitesi Mühendislik Bilimleri Dergisi Vol.36 Issue 1, pp.281-289

Document Type: Article

Publication Date: 3/2024

Document Language: Turkish

Document ID (Org No.): 2001302434

pISSN: 1308-9072

Issues

Authors:

Zafer Özdemir

Publisher:

Fırat University

Main Topics:

Malzeme Tasarım ve Davranışları

Journal:

Fırat Üniversitesi Mühendislik Bilimleri Dergisi Vol.36 Issue 1, pp.281-289

Document Type:

Article

Publication Date:

3/2024

Document Language:

Turkish

Document ID (Org No.):

2001302434

pISSN:

1308-9072