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There are many industrial applications where different types of materials must be combined and used. However, this is not always possible with welding, bonding and other disassembling methods or it contains various problems. In order to eliminate these problems, mechanical locking method (MLM), which is a new and environmentally friendly method, is used as an alternative to classical joining methods. MLM method can be used especially in joining material pairs with different chemical and physical properties. However, it can be preferred in situations where it is desired to reduce microstructure defects caused by high heat input. In this study; For MLM method, the effect of the connection angle, which can directly affect the joining quality, on the microstructure and mechanical properties was investigated. For this purpose, AISI 1040 steel and AA6013 aluminum alloy were joined at different connection angles (7°, 10° and 13°) using the MLM method. After the joining process, microstructure analysis, microhardness measurements and tensile tests were performed and the connection performance was determined. At the end of the study, the highest mechanical properties were obtained with a value of 241.38 MPa in the samples prepared with 13° connection angle. An other samples where the connection angle was lower, it was determined that the flange formation performing the connection showed an irregular distribution, the material flow was insufficient and the mechanical properties decreased as a result. [ABSTRACT FROM AUTHOR]

In this study; the corrosive wear behaviour of 1040 quality steels produced with the addition of boron in different proportions (3-15-30 ppm) was investigated. With this study, it is aimed to increase the wear resistance of steels exposed to abrasion in corrosive environment and to determine the maximum amount of boron that can be added under these conditions. In this context, 1040 grade commercial steels with different proportions of boron were subjected to corrosive wear tests under three different loads (10, 20 and 40 N) in 3.5% sodium chloride (NaCl) solution to determine their corrosive wear behaviour. Subsequently, surface profilometry studies were conducted to determine volumetric losses after wear tests. Finally utilizing a scanning electron microscope images of worn surfaces for wear characteristics were determined. In the studies carried out, boron added up to 15 ppm in 1040 quality steels showed a positive effect in terms of mechanical and tribological properties, but after this rate, it had a negative effect. [ABSTRACT FROM AUTHOR]

In this study, the effects of chip breaker forms (E-PL, M-PL, M-PM, M-MM) on the surface roughness and cutting forces were investigated in milling of AISI 1040 steel at CNC vertical machining center. Experimental studies were performed at four cutting speeds (150, 225, 300, 375 m/min), three feed rates (0.05, 0.1, 0.15 mm/tooth) and 1 mm depth of cut in dry cutting conditions. As a result of the experiments, the best surface roughness values and the lowest cutting force values were obtained with cutting tools having chip breaker form E-PL. Surface roughness was increased for all cutting tools with the increase in feed rate and decreased with increasing cutting speed. The best surface roughness values were determined as 0,134 µm, at the cutting speed of 375 m/min and at 0,05 mm / tooth feed with E-PL coded cutting tool. In addition, it was observed that cutting force increases with the increase in feed rate and decreases with the decrease in cutting speed.

Bu araştırmada, 46 HRc sertlikteki silindir şekle sahip AISI 1040 çeliği için dörder seviyeden oluşan kesme hızı, ilerleme ve talaş derinliği parametrelerine göre Taguchi L16 deney tasarımı oluşturulmuştur. Tornalama sonucu oluşan yüzey pürüzlülüğü (Rt) değerleri ölçülmüştür. Ölçülen Rt değerleri için MINITAB14 programından yararlanılarak çoklu regresyon modelleri oluşturulmuş ve Taguchi analizleri gerçekleştirilmiştir. Rt için oluşturulan regresyon modellerinde deney sonuçlarına en yakın sonuçlar %99.8 belirtme katsayısı ile ikinci dereceden çoklu regresyon modeliyle elde edilmiştir. Taguchi tasarımında sinyal/gürültü (S/N) oranları belirlendi. ANOVA analizinde sırası ile ilerleme, talaş derinliği ve kesme hızının Rt değerine %95 güven düzeyinde etki ettiği elde edilmiştir. Oluşturulan regresyon modelleri ve Taguchi analizi sonucu Rt üzerinde en etkin parametrenin ilerleme olduğu sonucuna varılmıştır.

Bu çalışmada; AISI 1040 çeliği, elektrik ark ve MIG ile kaynatılıp, numuneler üretilmiştir. Kaynaklı ve kaynaksız numuneler tam tavlama, normalizasyon, menevişleme ve gerilim giderme işlemlerine tabi tutulmuşlardır. İşleme tabi tutulan ve herhangi bir ısıl işlem yapılmayan numunelere çekme, üç nokta eğme, çentik darbe ve sertlik testleri yapılmıştır. Numunelerin çekme şekil değiştirmeleri kaynaksız parçaların, kaynaklı parçalara nazaran daha yüksek elde edilmiştir. Kaynaksız ve elektrik ark kaynağı yapılıp, gerilim giderme işlemi görmüş numunelerin akma ve çekme dayanım değerleri birbirlerine yakın elde edilmiştir. Martenzitik yapının dışarıda sert, içeri gittikçe yumuşak bir yapı haline geldiği görülmüştür. Ölçülen sertlik değerlerinin, kaynak dolgu metalinin ortasından başlayıp genelde dışarıya doğru bir artış gösterdiği gözlenmiştir.

Bu çalışmada, AISI 1040 çeliğinin aşındırıcı su jeti ile tornalanması esnasında işleme parametrelerinin kaldırılan talaş hacmime ve kesme derinliğine etkisi araştırılmıştır. Yapılan çalışmada deney sayısının en az olması için literatürde yapılmış olan çalışmalar göz önüne alınmış ve ön deneyler sonucu elde edilen tecrübelerle en uygun işleme parametre değerleriyle deneyler gerçekleştirilmiştir. Deneysel çalışmalarda pompa basıncı (350 MPa), aşındırıcı boyutu (Garnet formunda ve boyutu 80 mesh) ve nozul çapı (1.2 mm) sabit tutulmuştur. Ø 30 ve 240 mm ebatlarında 1040 çeliği, dört farklı aşındırıcı akış oranı (50, 150, 250 ve 350 gr/dak.), nozul mesafesi (2, 5, 8 ve 11 mm), nozul ilerleme miktarı (5, 15, 25 ve 35 mm/dak.) ve torna aynası deviri (25, 50, 75 ve 100 dev/dak.) işleme parametreleri değerlerinde işlenmiştir. Elde edilen bulgulara göre en yüksek talaş hacmi 5 mm/dak nozul ilerleme miktarında 1387,25 mm3 elde edilmiştir. En yüksek kesme derinliği ise 0,94 mm olarak 100 dev/dak torna aynası devrinde elde edilmiştir.

In this study, for the turning of AISI 1040 steel that has cylindrical shape and hardened up to 46 HRc, Taguchi L16 experimental design was created according to the parameters of cutting speed, feed rate and cutting depth which consist from four levels. Formed in result of turning, the total surface roughness (Rt) were measured. Regression models have been built. Taguchi analyzes were carried out utilizing by MINITAB 14 Program for measured values of Rt. The closest results of the test results, generated for the Rt regression model, were obtained with 99.8% specify coefficients in order second degrees regression model. Signal/Noise (S/N) ratios were determined in design of the Taguchi. In ANOVA analysis, it was obtained as an effect of the 95% confidence level on Rt values in order feed rate, cutting depth and cutting speed. The result of the regression model and Taguchi analysis was determined as feed rate to be the optimum parameter for Rt values. [ABSTRACT FROM AUTHOR]

In this study, AISI 1040 welding samples were produced by arc welding and MIG. The full annealing, normalizing, tempering and stress relief annealing treatment was applied for as-received and welded samples. Made process and untreated samples tensile, three point bending, impact and hardness tests were conducted. Tensile strain of the welded parts is higher than in the welded parts. The yield and tensile strength of the as-received and electric arc welded sample has similar value after stress relief treatment. Hard martensitic structure on the outside, inside is seen increasingly become a soft structure. Increasing in hardness was observed starting from the weld filler metal to outside. [ABSTRACT FROM AUTHOR]

In this study the effect of processing parameters during turning of AISI 1040 steel with abrasive water jet on machining volume and depth of cut. In the study, in order to keep the experiment quantity low, former studies in literature were taken into consideration and therefore experiments were realized with processing parameters and experiences that are most suitable to pre-experiments. In experimental studies pump pressure (350 MPa), abrader dimensions (in garnet form and dimension 80 mesh) and nozzle diameter (1.2 mm) were kept constant. 1040 steel with dimensions of Ø 30 and 240 mm were processed at four different abrader flow rate (50, 150, 250 and 350 gr/min), nozzle distance (2, 5, 8 and 11 mm), nozzle feed rate (5, 15, 25 and 35 mm/min) and lathe chuck revolutions (25, 50, 75 and 100 rpm). According to the findings the most highly material removal rate of 5 mm / min nozzle feed rate 1387.25 mm3 in the amount has been achieved. The maximum depths of cut 0.94 mm spindle speed of 100 rpm were obtained. [ABSTRACT FROM AUTHOR]