High-hot-strength spray-formed hot work die steel and preparation method thereof

Abstract

The invention discloses high-hot-strength spray-formed hot work die steel and a preparation method thereof, belonging to the technical field of hot work die steel. The die steel comprises the following components of 0.3-0.5 of C, 3.0-5.0 of Cr, 1.5-3.5 of Mo, 0.4-1.0 of W, 0.3-0.8 of Si, 0.3-0.5 of Mn, 0.8-1.5 of V, 0.03-0.10 of Nb, less than or equal to 0.03 of S, less than or equal to 0.03 of P and the balance of Fe. The preparation method comprises the process routes of spray forming, hot forging and heat treatment; different comprehensive mechanical properties are obtained by adjusting the quenching and tempering temperatures in a way of controlling process parameters and hot forging temperature in the spray forming process, so that the requirements of different working conditions are met. The compatibility of alloy elements is reasonably optimized according to the characteristic of a spray forming process and the special requirement of the hot work die steel for high-temperature performance, so that the high-hot-strength spray-formed hot work die steel has favorable high-temperature performance, good heat stability and tempering resistance, relatively high impact toughness and excellent comprehensive performance, and the service life of the hot work die steel is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, and specifically aims at inventing a new high-heat-strength spray-formed hot-work die steel material according to the characteristics of the spray forming process, as well as the technology and method of spray forming preparation, subsequent thermal processing and heat treatment. Background technique [0002] Hot working dies are mainly used for thermoforming various mechanical parts in industry. The most popular hot forming methods include forging, extrusion and casting of non-ferrous alloys. During the hot forming process, the mold is subjected to different mechanical loads and drastic changes in temperature. The combination of mechanical stress, thermal stress and chemical factors shows that the mold The performance of materials has extremely stringent requirements. Hot work die steel is the most commonly used material for making hot work dies. Among them, H13 steel is a kind of ho...

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Problems solved by technology

[0006] However, there are still two problems in the preparation of hot work die steel by spray forming technology: (1) The mold is directly formed by spray forming technology, since subsequent deformation treatment cannot be adopted to make it densified, so there must be enough in the process of spray deposition The liquid phase is used to ensure the density of the formed mold, but this will inevitably lead to a relatively coarse structure, which cannot give full play to the advantages of spray forming

(2) Did not readjust the alloy composition according to the characteristics of the spray forming process, and design a new type of hot work die steel for spray forming

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