CN103009702A

CN103009702A - W6Mo5Cr4V2/Q345 explosive welding composite material

Info

Publication number: CN103009702A
Application number: CN2012105370044A
Authority: CN
Inventors: 史航; 史和生; 刘远华; 刘春银
Original assignee: NANJING RUNBANG METAL CLAD MATERIAL CO Ltd
Current assignee: NANJING RUNBANG METAL CLAD MATERIAL CO Ltd
Priority date: 2012-12-13
Filing date: 2012-12-13
Publication date: 2013-04-03

Abstract

The invention discloses a novel composite material which takes W6Mo5Cr4V2 high-speed steel as a high wear-resistance, high hardness and high strength covering layer, and adopts Q345 and an explosive welding process. The unique production process comprises the following steps of: selecting researched main body explosive RB53 and denotation explosive cyclonite; overlapping three layers of explosive at a denotation point and peripheral parts, wherein the total thickness is increased by 10-15mm compared with that of other areas; and carrying out a secondary sectional annealing thermal treatment process. The composite material provided by the invention has the advantages that the covering layer has the complete advantages of the high-speed steel W6Mo5Cr4V2, and the substrate layer Q345 has a good mechanical property, so that the perfect combination of the two metal materials of different properties is realized, the property advantages of one single material is brought into full play, and particularly the composite material has wide application prospect in fields requiring cost conservation and producing knives, dies and the like of irregular structures.

Description

W 6Mo 5Cr 4V 2/ Q345 explosive welding composite

Technical field:

The present invention relates to continuous high temperature cutting in the industry such as explosive welding, machine-building, cutting tool, and can at Wear-resistant, high-temperature resistant and the compound cutter of high strength and the composite of special process environment (special type and heterotypic cutting tool) field use, belong to the technical field of tungsten, molybdenum, chromium, vanadium alloy steel.

Background technology:

W in the high-speed steel ₆Mo ₅Cr ₄V ₂High-speed steel and Q345 steel be each own good performance on the physics and chemistry performance, and deficiency is separately also arranged, and for seeking to obtain the new material of comprehensive technical performance, proposes to use W ₆Mo ₅Cr ₄V ₂High-speed steel is done cladding plate, make substrate with the Q345 steel, adopt explosion welding method a kind of high temperature resistant and have a composite material of the high conjugation of high strength in the hope of obtaining, but because of the two reason in opposite sex that is wanting in such as physical and chemical performances, the compound difficulty of the two explosive welding is large, key technology wherein not yet makes a breakthrough, with traditional technique for overlaying and hot pressing or hot rolling technology gained composite, the bond strength of its compound interface is low, exist cost high, the shortcomings such as yield rate is low and lack service life to so far, there is not yet relevant W ₆Mo ₅Cr ₄V ₂The reported in literature of high-speed steel and Q345 steel successful implementation explosive welding aspect.

Summary of the invention:

The object of the present invention is to provide a cover to produce the W of Wear-resistant, high-temperature resistant and the high conjugation of tool high strength ₆Mo ₅Cr ₄V ₂The technical scheme of/Q345 Explosive Welding Composite Plates material, technological measure aspect emphasis has been taked three on the basis of traditional bomb welding procedure: the explosive welding explosive of a kind of strong detonation wave and control lower bound explosion velocity is newly filled a prescription, and eliminates the layering thickening powder charge new technology of fire point and boundary effect and guarantees the double annealing heat treatment method that follow-up machining needs.The W that obtains ₆Mo ₅Cr ₄V ₂/ Q345 explosive welding compound tool and composite have good comprehensive technical performance.

Technical solution of the present invention:

Cladding plate W ₆Mo ₅Cr ₄V ₂Thick 2-10mm, main chemical compositions forms such as table 1 (in the percentage of mass fraction):

Table 1: multiple material W ₆Mo ₅Cr ₄V ₂Chemical composition

The thick 30-100mm of substrate Q345, main chemical compositions forms such as table 2 (in the percentage of mass fraction):

Table 2: the chemical composition of base material Q345

Find out from upper table, phosphorus content differs nearly one times, and the chromium in the cladding plate, nickel, tungsten, molybdenum, cobalt, copper differ greatly the hardness of the two and brittle behavior, cause that all to be difficult to obtain the two intact explosive welding with traditional explosion weld process and general annealing process compound.

This invents W ₆Mo ₅Cr ₄V ₂The explosive welding composite of/Q345, in its production method except the explosion weld process of routine emphasis taked to have powdery composite explosives RB53, explosive welding layering thickening charge process and the double annealing Technology for Heating Processing of strong detonation wave and lower bound explosion velocity.

One, the new prescription of described blasting explosive for explosion welding is:

Select the powdery composite explosives RB53 of the strong detonation wave of having of development and lower bound explosion velocity, utilize the detonation feature of explosive, with the velocity interval value inclined impact basal plate of regulation, realized W ₆Mo ₅Cr ₄V ₂Metal moment metallurgical binding with Q345.

RB53 Main Ingredients and Appearance: powdery emulsifying ammonium nitrate fuel explosive 40-45%, bulking ammonium nitrate explosive 18-23%, Nacl 23-30%, wood powder 6-7%.

Two, described explosive welding layering thickening charge process is:

For eliminating the inadequate defective of bond strength of fire point and boundary effect, adopt layering explosive RB53+ hexogen+RB53+ hexogen+RB53+ hexogen and gross thickness than the protective layer used waterglass of other regional increase 10-15mm. cladding plates at fire point and surrounding section.

Three, described double annealing Technology for Heating Processing is:

Once heat up 700-710 ℃, programming rate≤200 ℃/h, constant temperature 1.5-2.0h is warming up to 850-900 ℃ again, and secondary temperature retention time scope is determined according to the composite gross thickness, is generally 50-130 minute.

Advantage of the present invention:

1, cladding plate W ₆Mo ₅Cr ₄V ₂For tungsten is universal high-speed steel, its toughness, hardness, wearability and red hardness are all very strong.Can be used for making the larger cutter of the various power of withstanding shocks, the general large-scale and heat ductile forming cutter of cutter, also can make the part, cold-work die of the wearing and tearing under the high load capacity etc.Substrate Q345 then has good mechanical property, realizes that the metal material of two kinds of performances is perfectly unified, has given full play to the performance advantage of homogenous material, especially gathers around in fields such as saving cost and the required cutter of specific structure to have broad application prospects.

2, select the powdery composite explosives RB53 with strong detonation wave and lower bound explosion velocity, and select explosive welding hierarchical composite thickening charge process to adapt to well W at fire point and surrounding section ₆Mo ₅Cr ₄V ₂With the explosion weld process requirement of two kinds of materials of Q345, obtained the strong metallurgical bonding interface of two metals through explosive detonation, and in conjunction with the bond strength of a face reached fully predetermined index (〉=210MPa).

3, select the double annealing Technology for Heating Processing, metallic composite product after the heat treatment not only has very high bond strength, and physics, the chemical property of multiple layer and basic unit remain unchanged, when smoothing afterwards and cutting cold and hot working, all Interface Cracking or segregation phenomenon can not appear.

The specific embodiment

Embodiment 1

Industrial-scale production W ₆Mo ₅Cr ₄V ₂/ Q345 explosive welding composite, its production method is:

One, quick-fried front pretreating process: 1, treat combination interface with the polishing of emery wheel and cloth wheel, polishing, remove the oxide skin(coating) on surface, reach flat, light, clean purpose.2, base, compound plate and cloth medicine size determines; Compound plate is than each long 25mm of substrate surrounding, the same compound plate of cloth medicine size.3, base, compound plate are scrubbed two faying faces with acetone before installing, to eliminate the dirts such as surperficial dust and oil stain.

Two, explosive welding combination process: select the powdery composite explosives RB53 with strong detonation wave and lower bound explosion velocity on the basis of traditional bomb welding procedure, adopt RB53+ hexogen layering thickening new technology with the velocity interval value inclined impact basal plate of regulation in demolition point and surrounding section, realize the metallurgical binding of two metallic plate moments.

Three, Technology for Heating Processing: be warming up to 750 ℃, programming rate≤200 ℃/h, insulation 1.5-2.0h is warming up to 900 ℃, temperature retention time 50min again.

W ₆Mo ₅Cr ₄V ₂/ Q345 explosive welding composite, its structure comprise ordinary low-alloy steel basic unit and are positioned at top high speed steel W ₆Mo ₅Cr ₄V ₂Multiple layer, basic unit and the W that is located thereon ₆Mo ₅Cr ₄V ₂Coating after explosive welding strong metallurgical binding together, coating W wherein ₆Mo ₅Cr ₄V ₂Thickness is 2mm, and ordinary low-alloy steel Q345 thickness is 50mm.

After testing, the combination interface intensity of this composite is 320MPa, and " JB/T4748-2002 " standard is 〉=200.Can find out that metallic composite product after heat treatment has very high interface bond strength and recombination rate.Therefore, when the cold and hot processes such as enforcement smoothing, cutting, segregation phenomenon can not occur ftractureing between multiple layer and the basic unit interface, can be applied to the equipment and materials demand under the specific structure condition fully.

Claims

1.W ₆Mo ₅Cr ₄V ₂/ Q345 explosive welding composite is characterized by Q345 and is positioned at its surperficial high speed steel W ₆Mo ₅Cr ₄V ₂The coating metallurgical binding together, high speed steel W wherein ₆Mo ₅Cr ₄V ₂Coating thickness is 2-10mm, and the Q345 groundwork thickness is 30-100mm.

2.W ₆Mo ₅Cr ₄V ₂/ Q345 explosive welding composite, the layering that it is characterized in that adopting in the production process explosive welding explosive that improves bursting strength and lower bound explosion velocity newly to fill a prescription, eliminate fire point and boundary effect are thickeied charge process and are guaranteed that the double annealing heat treatment method of follow-up machining needs amounts to three new technologies.

3. the explosive welding explosive of lower bound explosion velocity according to claim 2 is newly filled a prescription, it is characterized in that: the powdery composite explosives RB53 that selects the strong detonation wave of having of development and lower bound explosion velocity, utilize the detonation feature of explosive, with the velocity interval value inclined impact basal plate of regulation, realized W ₆Mo ₅Cr ₄V ₂With the metal moment metallurgical binding of Q345, RB53 Main Ingredients and Appearance: powdery emulsifying ammonium nitrate fuel explosive 40-45%, bulking ammonium nitrate explosive 18-23%, Nacl 23-30%, wood powder 6-7%.

4. charge process is thickeied in the high layering of eliminating fire point and boundary effect according to claim 2; it is characterized in that: for eliminating the inadequate defective of bond strength of fire point and boundary effect; adopt layering explosive RB53+ hexogen+RB53+ hexogen+RB53+ hexogen and gross thickness than other regional increase 10-15mm, the protective layer used waterglass of cladding plate at fire point and surrounding section.

5. double annealing heat treatment method according to claim 2, it is characterized in that: intact for the properties for follow that guarantees composite, adopt double annealing heat treatment, and once heat up 700-710 ℃, programming rate≤200 ℃/h, constant temperature 1.5-2.0h is warming up to 850-900 ℃ again, secondary temperature retention time scope is determined according to the composite gross thickness, is generally 50-130 minute.