GMAW Esaslı Eklemeli İmalat İle Üretilen Düşük Karbonlu Çeliğin Mekanik Özellikleri

Tel ark eklemeli imalat, özellikle büyük ebatlı metal parçaların ekonomik üretimi ve nispeten yüksek biriktirme oranları gerektiren bir dizi uygulamalar için yüksek esneklik ve verimliliğe sahiptir. Bu çalışmada, düşük karbonlu çelik telden GMAW tabanlı eklemeli imalat uygulanarak üretilen parça mekanik özelliklerinin (çekme dayanımı ve mikrosertlik) deformasyon hızına göre değişimi araştırılmıştır. Bu bağlamda, eklemeli imalat parçadan dikiş yönüne dik ve paralel olarak hazırlanan numunelere 1 ve 4 mm/sn hızlarında çekme deneyleri uygulanmıştır. Kaynak dikiş yönüne dik numunelerde, süneklikteki anizotropik davranış yüzünden deformasyon hızının artmasıyla çekme dayanımında artış görülürken yüzde uzama miktarlarında azalma belirlenmiştir. Çekme hızının dört kat artmasıyla dikiş yönüne paralel numunede çekme dayanımı ortalama 545 MPa, dik numunede ise 524 MPa olarak elde edilmiştir. Dikiş yönüne paralel numunede, orijinal numuneye göre çekme deformasyonu neticesinde mikrosertlikte yükselme olurken, bu artış 1 mm/sn ve 4 mm/sn için sırasıyla ortalama %56 ve %64 olarak hesaplanmıştır. Dikiş yönüne dik numunelerde, bu oranlamada bir miktar azalma olsa da orijinal numuneye göre mikrosertlik değerlerindeki artış sırasıyla %46 ve %53 olarak belirlenmiştir.

Anahtar Kelimeler:

Eklemeli imalat, Düşük karbonlu çelik, WAAM, Mekanik özellikler, Deformasyon hızı

Mechanical Properties of Low Carbon Steel Produced by GMAW-based Additive Manufacturing

Wire arc additive manufacturing has high flexibility and efficiency, especially for the economical production of large-size metal parts and a range of applications that require relatively high deposition rates. In this study, the variation of the mechanical properties (tensile strength and microhardness) of the part produced by GMAW-based additive manufacturing from low carbon steel wire according to the deformation rate was investigated. In this context, tensile tests at 1 and 4 mm/sec speeds were applied to the samples prepared perpendicular and parallel to the seam direction from the additive manufacturing part. In the samples perpendicular to the weld seam direction, an increase in tensile strength was observed with an increase in the deformation rate due to the anisotropic behavior in ductility, while a decrease in percent elongation was determined. With the increase of the tensile speed four times, the average tensile strength of the sample parallel to the seam direction was 545 MPa, and the vertical specimen was 524 MPa. In the sample parallel to the seam direction, there was an increase in microhardness as a result of tensile deformation compared to the original sample, while this increase was calculated as 56% and 64% on average for 1 mm/sec and 4 mm/sec, respectively. Although there was a slight decrease in this ratio in samples perpendicular to the seam direction, the increase in microhardness values compared to the original sample was determined as 46% and 53%, respectively.

Keywords:

Additive manufacturing, Low-carbon steel, WAAM, Mechanical properties, Deformation speed,

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