چکیده مقاله
Today, tool steels are used for applications such as extrusion molding, hot casting and forging Due to the conditions of use of this type of steels, which are always subjected to thermal and mechanical stresses as well as wear, the surface hardness of this type of steels along with its toughness is necessary In the present study, the hardness of the surface steel of H13 was investigated by cladding an high entropy alloy with the phases formed in situ using the tungsten insert gas TIG cladding process and the filler metal of this alloy High entropy alloy with unequal atomic ratio Al2CrFeCoCuTiNi2 was used The alloy was prepared by vacuum arc remelting VAR casting and the filler metal was cut into 1 and 2 mm diameters with the help of a wire cutter In order to control the degree of dilution, the surface melting process was performed with the different heat inputs It was observed that with decreasing current welding up to 50 A, the heat input decreases and then with decreasing current welding up to 40 A , the heat input increases due to decreasing speed process Due to the fact that increasing the heat input, increases the degree of dilution, so the current welding 50 A creates the desired degree of dilution 45% Despite the effect of dilution of the base metal and increasing the atomic percentage of Fe in the clad layer, it was observed that clad layer has a high entropy property Also, the Ti element reacts with the C in the base metal to form TiC carbide in situ This phase had very fine dimensions of about 5 8 μm and uniform distribution in the clad zone, which led to a significant increase in hardness In the clad zone with current welding 50 A, the microstructure of high entropy alloy consisted of two phases, BCC and FCC Hardness of the samples showed that the hardness decreases with increasing the heat input of the process and also with increasing the degree of dilution The hardness of the clad layer in current welding 50 A is about 733 HV , which is almost twice thehardness of the base metal
کلیدواژهها
نویسندگان
Yousef Moradipour
Mahmoud Sarkari Khorrami
Mahmoud Sarkari Khorrami
Yousef Moradipour
شیوه ارجاع
Moradipour, Yousef and Sarkari Khorrami, Mahmoud,1400,The Effect of heat input of TIG cladding with high entropy alloy filler metal on surface alloying of H13 tool steel,4th International Conference on Welding and Non Destructive Testing & 22nd National Conference on Welding & Inspection & 11th National Conference on NDT,Isfahan
ارائهشده در
مجموعه مقالات چهارمین کنفرانس بین المللی جوشکاری و آزمایش های غیرمخرب و بیست و دومین کنفرانس ملی جوش و بازرسی و یازدهمین کنفرانس ملی آزمایش های غیرمخرب18 اسفند 1400 · اصفهان