CN101974724B - Iron-based alloy powder for high strength and toughness laser deposited coating - Google Patents
Iron-based alloy powder for high strength and toughness laser deposited coating Download PDFInfo
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- CN101974724B CN101974724B CN 201010555739 CN201010555739A CN101974724B CN 101974724 B CN101974724 B CN 101974724B CN 201010555739 CN201010555739 CN 201010555739 CN 201010555739 A CN201010555739 A CN 201010555739A CN 101974724 B CN101974724 B CN 101974724B
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Abstract
The invention discloses iron-based alloy powder for a high strength and toughness laser deposited coating in the technical field of alloy materials. The iron-based alloy powder comprises the following components: 0.60 to 1.00 percent of C, 0.35 to 0.70 percent of Si, 0.30 to 0.60 percent of Mn, 5.00 to 7.00 percent of Cr, 2.50 to 4.00 percent of Ni, 1.50 to 2.50 percent of Mo, 1.00 to 1.50 percent of W, 0.70 to 1.00 percent of V, 0.20 to 0.40 percent of Ti, 0.50 to 0.70 percent of B, 0.20 to 0.40 percent of Nb, 0.10 to 0.30 percent of Ce and the balance of Fe. The iron-based laser deposited alloy coating without cracks in large area can be obtained without pre-heating and post thermal treatment, the deposited alloy coating has high hardness which reaches 62 to 67HRC, and the yield strength reaches 1,700 to 2,000MPa.
Description
Technical field
What the present invention relates to is a kind of powder of technical field of alloy material, specifically is that a kind of high-strong toughness laser cladding of coating is used iron(-)base powder.
Background technology
In the field of surface engineering technique, surface engineering technologies such as traditional submerged arc overlay welding, thermospray be difficult to be similar to the cold roll high-load, certain waste and old part of tough recovers and performance boost.The technology such as submerged arc overlay welding, thermospray of comparing; The laser cladding technology is a kind of novel surface treatment technology; The laser cladding layer has effects such as ultra solution strengthening, dislocations strengthening, refined crystalline strengthening, particle strengthening; Make it have high surface hardness, thereby make the molten alloy that applies have high-wearing feature and anti-fatigue performance under high speed, the high-load frictional wear condition.
Laser cladding be laser beam with high-energy-density as thermal source, at substrate material surface melting welding one deck novel material, thereby make metal material surface have the technology of excellent properties such as wear-resisting, anti-corrosion, anti-oxidant and thermal stability is good.Yet the high hardness wear-resisting laser cladding exists in the molten deposited process and the crack problem in the military service process, and this is that laser cladding is used the thorny problem that faces always.The rapid heating of laser cladding has and plain metal melting different features with the overlay of the feasible generation of cooling fast; The bad distribution of the bulk hard phase in the overlay and as cast condition interdendritic bulk or carbide network are the inducements that cracks, and it is to cause the overlay crack propagation until the rimose direct factor that the solidification shrinkage of overlay material reaches the tensile stress that is produced with the base material mismatch in coefficient of thermal expansion.In recent years; Both at home and abroad from adopting process aspects such as gradient material, preheating slow cooling and adjusting process parameter that the cracking sensitivity that reduces overlay has been done big quantity research; Through in powdered alloy, reducing carbon content, adding the cracking sensitivity that material designs such as Ti, REE crystal grain thinning reduce overlay; Design some laser cladding special-purpose iron-base powdered alloys, though above method plays a role to suppressing the overlay crackle, also there is certain limitation in these powder.Too high carbon content (＞1%) then makes the coating toughness plasticity significantly reduce, and low excessively carbon content (＜0.25%) can make coating not reach the high firmness requirement.
Retrieval through to prior art is found; Chinese patent document number CN1737197A (crack controlling means of laser deposition formed metal parts) has reported and has a kind ofly improved the cladding forming tissue through ultrasonic vibration; Reduce residual tension; Reduce and eliminate the invention of crackle, but this method equipment is loaded down with trivial details.Chinese patent document number CN101381869A (the high hard nothing of laser melting coating is split ferrous alloy special metals powder) has reported a kind of invention; Though cladding layer can reduce crack sensitivity; But because than low carbon content (0.4%) and alloying element content (10%); Be difficult to generate the diffusing particle wild phase, the overlay hardness value is below 63HRC, and tensile strength is 1300MPa; Be difficult to reach the cold roll requirement high firmness (63～70HRC), also having difficulties aspect the component surface reinforcement that is in the high-load wear working condition that is applied to be similar to cold roll.CN101298119A (laser deposited alloy welding powder) has also reported a kind of invention; Its essence is similar to the welding material of 1Crl3 or 2Crl3 stainless steel-like; With middle carbon (0.3～0.5%), Gao Ge (13%) and high boron (1.5%) is characteristic, but is primarily aimed at the surface strengthening and the reparation of hot roll.Lack a kind of high hardness high toughness of the component of machine of under the high-load wear working condition, using of cold roll and so on, molten special-purpose iron-base powdered alloy that applies of laser surface of lower cost of being directed against in the market, to realize the laser cladding reparation of this type component.
Summary of the invention
The present invention seeks to above-mentioned deficiency to the prior art existence; Provide a kind of high-strong toughness laser cladding of coating to use iron(-)base powder; Realize suppressing the overlay cracking, to be applied to laser cladding reparation and surface strengthening to the mechanical component that are similar to cold roll high-load frictional wear application scenario.This powdered alloy can obtain the high abrasion laser cladding ferrous alloy of flawless, high-strong toughness under the condition that need not preheating and slow cooling, this laser cladding ferrous alloy also has higher temper resistance simultaneously.
The present invention realizes through following technical scheme; Powdered alloy of the present invention is made up of C, Si, Mn, Cr, Ni, Mo, W, V, Ti, Nb, Ce and Fe; The weight percent content of its component is followed successively by: 0.60%～1.00% C, 0.35%～0.70% Si, 0.30%～0.60% Mn, 5.00%～7.00% Cr, 2.50%～4.00% Ni, 1.50%～2.50% Mo, 1.00%～1.50% W, 0.70%～1.00% V, 0.20%～0.40% Ti, 0.50%～0.70% B, 0.20%～0.40% Nb, 0.10%～0.30% Ce; Surplus is Fe, and the weight sum of each component is 100%.
The granularity of described powdered alloy is 150～300 orders.
Preparing method of the present invention: with corresponding various metal-powders according to above-mentioned prescription batching after overcharge the mechanical ball mill mixing of branch and form.Or according to above-mentioned proportioning raw materials selection metallic substance; Metallic substance being crushed to small powder, in smelting furnace, becoming liquid with pyrotic smelting, is that atomizing medium atomizes with nitrogen; Under anaerobic or low-oxygen environment, let metal-powder be cooled to room temperature, carry out powder sieving then.
When adopting iron(-)base powder of the present invention to carry out laser cladding, the laser thermal source can be the YAG Solid State Laser, also can be the C02 gas laser, also can be semiconductor laser or optical-fiber laser.
The present invention compares prior art and has following advantage:
The mentioned component iron(-)base powder that the present invention proposes is specially adapted under the high-load working order, has the laser cladding of the ferrous alloy part of high-strong toughness requirement to strengthen and reparation, strengthens and reparation like the roll surface laser cladding of cold roll.Laser cladding iron(-)base powder use characteristics is good, under the condition that need not preheating and subsequent heat treatment, can obtain flawless laser cladding ferrous alloy.
The molten main performance index of processing with the present invention of applying alloy coat of iron based laser has: under the room temperature, the molten deposited alloy coat hardness of iron based laser is 62HRC～67HRC, and ys is 1700MPa～2000MPa.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment 1: be made up of C, Si, Mn, Cr, Ni, Mo, W, V, Ti, Nb, Ce and Fe; Wherein each compositions in weight percentage is: 0.60% C, 0.42% Si, 0.50% Mn, 5.50% Cr, 2.50% Ni, 1.50% Mo, 1.50% W, 0.70% V, 0.25% Ti, 0.50% B, 0.30% Nb, 0.20% Ce, surplus is Fe.Adopting above-mentioned prescription, is that 150～300 purpose powder mix through abundant mechanical ball milling with various granularities.Employing laser is thermal source, and on the matrix of cold roll with steel 9Cr2Mo, the molten application layer hardness of acquisition is HRC63 with the powdered alloy cladding, and ys is 1721MPa.
Embodiment 2: be made up of C, Si, Mn, Cr, Ni, Mo, W, V, Ti, Nb, Ce and Fe; Wherein each compositions in weight percentage is: 0.70% C, 0.45% Si, 0.50% Mn, 6.50% Cr, 3.50% Ni, 2.00% Mo, 1.00% W, 0.80% V, 0.35% Ti, 0.60% B, 0.30% Nb, 0.25% Ce, surplus is Fe.Adopt above-mentioned prescription, coating production is with embodiment 1.The molten application layer hardness that obtains is HRC65, and ys is 1842MPa.
Embodiment 3: be made up of C, Si, Mn, Cr, Ni, Mo, W, V, Ti, Nb, Ce and Fe; Wherein each compositions in weight percentage is: 0.90% C, 0.50% Si, 0.50% Mn, 7.00% Cr, 4.00% Ni, 2.00% Mo, 1.50% W, 0.80% V, 0.40% Ti, 0.70% B, 0.30% Nb, 0.30% Ce, surplus is Fe.Adopt above-mentioned prescription, coating production is with embodiment 1.The molten application layer hardness that obtains is HRC67, and ys is 1962MPa.
Claims (5)
1. a high-strong toughness laser cladding of coating is used iron(-)base powder; It is characterized in that; The weight percent content of its component is followed successively by: 0.60%～1.00% C, 0.35%～0.70% Si, 0.30%～0.60% Mn, 5.00%～7.00% Cr, 2.50%～4.00% Ni, 1.50%～2.50% Mo, 1.00%～1.50% W, 0.70%～1.00% V, 0.20%～0.40% Ti, 0.50%～0.70% B, 0.20%～0.40% Nb, 0.10%～0.30% Ce; Surplus is Fe, and the weight sum of each component is 100%.
2. high-strong toughness laser cladding of coating according to claim 1 is used iron(-)base powder, and the weight percent content of its component is followed successively by: 0.60% C, 0.42% Si, 0.50% Mn, 5.50% Cr, 2.50% Ni, 1.50% Mo, 1.50% W, 0.70% V, 0.25% Ti, 0.50% B, 0.30% Nb, 0.20% Ce, surplus are Fe.
3. high-strong toughness laser cladding of coating according to claim 1 is used iron(-)base powder; It is characterized in that the weight percent content of its component is followed successively by: 0.70% C, 0.45% Si, 0.50% Mn, 6.50% Cr, 3.50% Ni, 2.00% Mo, 1.00% W, 0.80% V, 0.35% Ti, 0.60% B, 0.30% Nb, 0.25% Ce, surplus are Fe.
4. high-strong toughness laser cladding of coating according to claim 1 is used iron(-)base powder; It is characterized in that the weight percent content of its component is followed successively by: 0.90% C, 0.50% Si, 0.50% Mn, 7.00% Cr, 4.00% Ni, 2.00% Mo, 1.50% W, 0.80% V, 0.40% Ti, 0.70% B, 0.30% Nb, 0.30% Ce, surplus are Fe.
5. high-strong toughness laser cladding of coating according to claim 1 is used iron(-)base powder, it is characterized in that, the granularity of described powdered alloy is 150～300 orders.
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