Microstructural Effects in the Steel HWS 1.2379 Applying the Process of Plasma Transferred ARC PTA.
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MICROSTRUCTURAL EFFECTS IN THE STEEL HWS 1.2379 APPLYING THE PROCESS OF PLASMA TRANSFERRED ARC PTA. A. Aguirre1, F. García1, J. Acevedo1, J. Andrade.2 [email protected] 1
Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, cp. 25290, Coahuila, México Tel: 4 11 32 00. 2
Asociación de Investigación Metalúrgica del Noreste (AIMEN). Relva, 27 A Torneiros - 36410 Porriño - Pontevedra - España. Tel: +34 986 344 000.
ABSTRACT At present, the industrial sector requires the recovery of tool steel components subjected to severe wear which are built with steel HWS these have the same properties in all tribology directions and have great success in building tooling. In this paper, we recover the previously HWS steel machining with a fillet of 2mm caused by the metallurgical recovery of the component, applying the process of plasma transferred arc PTA which has very good fats dilution properties in comparison to other conventional processes currently applied for the recovery of tooling, such as GTAW, SMAW, SAW. The experiment was conducted with input D2 and M2 with one and two welding seams, making the assessment metallography, hardness and wear tests pin-on-disk. Finding a decrease in the hardness of the interface line, according to the evaluation of wear pinon-disk, had a higher wear rate of the filler metal in the M2 D2.
KEYWORDS: Welding, coating, powder.
INTRODUCTION At present the forming industry requires constant maintenance and replacement of worn tooling [1.8] These components are recovered with conventional welding processes such as SMAW, GTAW, SAW to name a few [1,2], the process PTA (Plasma Transfer Arc) is proposed as an alternative recovery HWS tool steel components 1.2379 [6.3].The PTA is a very versatile process for ease of application of the powder along with the low dilution are one of the main advantages of the process [6]. Therefore it is important to study the behavior of the steel microstructure to be recovered by means of a welding process [8]. The figure shows the torch of the PTA process.
Figure 1. Torch of the PTA process [6] EXPERIMENTAL PROCEDURE The experiment consisted in the material recovery of 1.2379 HWS powder metallurgy through the application process (plasma transfer arc) transferred arc plasma PTA. 2mm were recovered with (a) fillet weld and two supply M2 and D2 were used to determinate the contribution that has better performance in mechanical and metallurgical properties. Were carried out metallographic, hardness and wear tests. The equipment used was Castolin Eutectic Gap 3000 with a torch electrode of 3.2 mm, Table 1 shows the chemical composition of materials used in the experiments Table 1. Chemistry composition (% wt). Element
Substratum Filler metal M2 Filler metal D2
C 1.55 0.85 1.55
Mn 0.35 0.3 0.35
SI 0.35 0.3 0.35
Cr 11.5 4.15 11.5
Mo 0.8 5 0.8
V 0.8 1.95 0.8
Table 2 Parameters used in the experimental process parameters PTA process. PARAMETERS Test Number Amperage (A) Voltage (V) Pulsed current p
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