Research On Microstructure And Properties Of Welded Joints At H13Steel

Today,competitive of energy happens in the society. All walks of life will be subjectedto the impact of the energy crisis. The machining manufacturing industry is a huge energyconsumption industries. With the accelerating development in industrial, For a country oreven the whole world, machining has had to bear an increasing important role. In themachining process, Die steel production is a typical process which has high productioncosts and energy consumption. In the various categories of the mold steel. Hot work diesteels work in poor conditions. Serving hot and cold cycles lead to its easy to crack, Seriousor even failure. For such a high-cost, complex production process large mold, If itabandoned,it must cause a great waste of energy. And it will be leaded to increase inproduction costs due to the failure of the mold steels. So for mold steels failure phenomenon,now, more and more scholars and steel practitioners actively exploring remedies andmeasures to improve its performance. The use of welding is now widely adoptedtechnologies, This is also fully consistent with the aspirations of the people for savingenergy and production costs. But welding repair can not only play the role of repairing andconnection the failure materials. We should discuss in depth their state after welding ofmold steels and the change of the microstructure and the Influence of properties. Identifymore rational organization of the mold steel after welding and the use of performance tomeet the industrial demand.In this paper, TIG welding method is adopet to H13steels.And study the part of themicrostructure and mechanical properties of welded joints detailed. Use the heat treatmentprocess and the electrical pulse technology process the H13steel welded joints. Discussedin detail the impact of several processing methods of Welded Joints. Explore the H13steelwelded joints organizational performance change law. Analyzes H13steel to get a goodperformance method after welding. It is also important to actual industrial production.Welded after welding, in H13steel welded joint microstructure,coarse martensite is mainlycomposed, and some carbide. In the weld area, The coarse martensite attached around carbide particles. Fill solder layer of tempered martensite. This is mainly due to thecharacteristics of the multilayer welding. Relative to the welded joints, Base metal did notaffect the action of heat. The organization is tempered martensite and Sorbite.For H13steels, heat treatment has happened. The quenching experiments specimenorganizations thick lath martensite. Modulated H13steels arer tempering process, Weldedjoint portion into tempered martensite. Microstructure was evenly distributed, carbideprecipitated less, organizations can be refined. The area of the base metal has also beensignificantly refined compared to welded.In this article, the H13steel has been treated use electric pulse after welding, and the welded joint microstructure of grain refinement show more obvious. The electric pulse processing is equivalent to the short time heat treatment which carried out in the form of a pulse. The number of tempered martensite and globular carbide increase in the welding joint after electric pulse treatment. Coarse martensite gradually transformed into small martensite from the capping layer to the bottom welding layer. In the parent metal area, the length and orientation of the martensite decrease and disappeared, most of which are tempered martensite.andsorbite,the microstructure are more refined.After mechanical properties testing of various approaches, it can be found that weldedH13steel specimen microhardness have a big variations. It is minimum in the fusion zone.Vulnerable to stress concentration to fracture. After the heat treatment and after the pulseprocessing, the hardness values relative to the average. This shows that in the entire weldingjoints,it has good mechanical properties.In summary, we can say that heat treatment and electrical pulse process can significantly change the organization structure of the welded joint and parent material for H13steel specimens simulated welding. And thus, the H13steel welding joint got better mechanical properties. Which has important significance and reference function for welding and post weldtreatment in the actual production.