CN105154871A - Laser manufacturing method for preparing TiAl-based alloy gradient flame-resistant materials on titanium alloy - Google Patents

Laser manufacturing method for preparing TiAl-based alloy gradient flame-resistant materials on titanium alloy Download PDF

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CN105154871A
CN105154871A CN201510559921.6A CN201510559921A CN105154871A CN 105154871 A CN105154871 A CN 105154871A CN 201510559921 A CN201510559921 A CN 201510559921A CN 105154871 A CN105154871 A CN 105154871A
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flame
titanium alloy
tial
ti2alnb
prepare
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CN105154871B (en
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孙兵兵
张学军
陈冰清
郭绍庆
李能
唐思熠
杜博睿
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BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
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BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
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Abstract

The invention belongs to the technical field of laser processing and relates to a laser manufacturing method for preparing TiAl-based intermetallic compound gradient flame-resistant materials on titanium alloy. The laser manufacturing method is mainly applied to preparation of a titanium alloy surface flame-resistant layer so as to improve the flame resistance property of the titanium alloy. The TiAl-based intermetallic compound with the flame resistance property superior to that of TC4 titanium alloy is selected as the flame-resistant layer, and the laser cladding process is used for preparing the gradient flame-resistant materials on the TC4 titanium alloy. The prepared flame-resistant layer is good in combination with the TC4 base body, the crack defect on the surface is avoided, and through testing, the flame resistance property is obviously superior to that of the TC4 titanium alloy.

Description

Titanium alloy is prepared the laser manufacture method of TiAl-base alloy gradient fire retardant material
Technical field
The invention belongs to technical field of laser processing, relate to a kind of laser manufacture method preparing TiAl base intermetallic compound gradient fire retardant material on titanium alloy material, be mainly used in the preparation of titanium alloy surface flame-retardant layer, improve the flame-retarding characteristic of titanium alloy.
Background technology
In the requirement that a new generation's advanced aero engine improves thrust-weight ratio and pneumatic plant, titanium alloy product generation titanium fire be inclined to the contradiction between increasing, to resistance to higher temperature with resist the new type high temperature titanium alloy material burnt and propose an urgent demand.Engine titanium fire is that a kind of typical engine forces firing accident, and the high energy friction between blade and casing or load impacting etc. are main ignition sources.
Based on above situation, German MTU aircraft engine company tests TiAl, Ti 3the rate of combustion of Al and TC4 titanium alloy, show that TiAl-base alloy can prevent titanium fire from occurring for turbine engine, and the working temperature of this alloy can reach 600 DEG C even 800 DEG C, in the hpc in future, have good application prospect.According to the characteristic of TiAl alloy, the application component that this alloy is applicable in aircraft engine is the key parts such as hpc blade, engine turbine blade, whirlpool and casing.
Due to the existence of the shortcomings such as TiAl-base alloy plasticity and toughness are poor, shaping difficulty is large, occur the defects such as crackle when inevitably causing TiAl-base alloy foundry goods occur the casting flaws such as pore, shrinkage porosite, crackle and self connect in preparation process, therefore the preparation of this material parts is extremely difficult.
Laser melting and coating technique synchronously gives selected cladding material on the surface at base alloy, then make it to melt with substrate top layer through laser treatment simultaneously, and be rapidly solidificated into extent of dilution low, be the upper layer of metallurgical binding with base material, thus significantly change the processing method of the characteristic such as wear-resisting, anti-corrosion, heat-resisting of base material, cladding layer thickness is controlled, can carry out constituency cladding etc., therefore the method is widely used in the surface modification of titanium alloy.
Based on above analysis, this patent adopts laser melting and coating technique, with TC4 titanium alloy for base material, and preparation TiAl base intermetallic compound gradient fire retardant material.
Summary of the invention
The object of the invention is to propose a kind of laser manufacture method preparing TiAl base intermetallic compound gradient fire retardant material on titanium alloy material, be mainly used in the preparation of titanium alloy surface flame-retardant layer, improve the flame-retarding characteristic of titanium alloy.
The particular content of technical solution of the present invention is:
The step of the method is:
(1) prepare flame-retardant layer material, flame-retardant layer material is TiAl, Ti2AlNb or Ti 3al, adopts the powder process of centrifugal powder process mode, and granularity is 150 order ~ 325 orders;
(2) method of laser melting coating is adopted to prepare TiAl, Ti2AlNb or Ti on titanium alloy base material 3al fire retardant material; When adopting Ti2AlNb as flame-retardant layer, directly on titanium alloy base material, carry out laser melting coating preparation; When selecting Ti 3when Al is as flame-retardant layer, on titanium alloy base material, the method for laser melting coating is first adopted to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then laser melting coating Ti 3al flame-retardant layer, thickness is 0.2 ~ 0.5mm; When selecting TiAl as flame-retardant layer, first on titanium alloy base material, adopt the method for laser melting coating to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then preheating is carried out to titanium alloy base material, when preheating temperature reaches 750 DEG C, adopt laser cladding method to prepare TiAl flame-retardant layer on Ti2AlNb transition layer, thickness is 0.2 ~ 0.5mm;
(3) after prepared by flame-retardant layer, under Ar gas shielded or vacuum environment, the process of whole removing stress annealing is carried out, annealing region: 650 DEG C ~ 850 DEG C.
The advantage that the present invention has and beneficial effect
The present invention adopts laser melting and coating technique at titanium alloy material surface preparation TiAl base intermetallic compound gradient fire retardant material, laser melting coating has following advantage when preparing gradient material: the energy density of laser beam is high, rate of heating is fast, less to the heat affecting of titanium alloy base material, the degree of depth of fusing into titanium alloy base material can be controlled in below 0.1mm, the unrelieved stress that postwelding produces is little, causes the distortion of base material little, the generation of control surface crackle; The thickness range of cladding layer is comparatively large, individual layer cladding thickness 0.1 ~ 2.0mm; Accurately can control the forming thickness of gradient material.
Titanium alloy prepared by the present invention/TiAl base intermetallic compound gradient fire retardant material, because middle transition layer material and preparation technology's is preferred, material surface flawless defect, between each layer of gradient material, fusion rate can reach 100%, in conjunction with very well.Titanium alloy/Ti 3al gradient material surface can heatproof 600 ~ 650 DEG C, titanium alloy/Ti2AlNb gradient material surface can heatproof 650 ~ 700 DEG C, titanium alloy/TiAl gradient material surface can heatproof 700 ~ 750 DEG C, this gradient material is while remaining titanium alloy lightweight nature, drastically increase the flame-retarding characteristic of titanium alloy surface, may extend to the material development of high-speed aircraft and high thrust-weight ratio engine Burn-Resistant Titanium Alloy.
Embodiment:
Below with reference to example, technical solution of the present invention is described in further detail:
According to Burn-Resistant Titanium Alloy component installation position aboard, analyze the fire retardancy situation needed for it, clearly need the fire retardant material selected, by analyzing above and confirming, implement following concrete steps:
(1) prepare flame-retardant layer material, flame-retardant layer material is TiAl (Ti-25Al-2Nb), Ti2AlNb (Ti-22Al-25Nb) or Ti 3al (Ti-24Al-11Nb), adopts centrifugal powder process mode by 3 kinds of material powder process, and granularity is 150 order ~ 325 orders;
(2) prepare front surface cleaning, use wire wheel polishing to remove oxidation film on titanium alloy surface, metal background color is exposed in visual inspection, then uses acetone scrub;
(3) method of laser melting coating is adopted to prepare TiAl, Ti2AlNb or Ti on titanium alloy base material 3al tri-kinds of fire retardant materials, when adopting Ti2AlNb as flame-retardant layer, directly carry out laser melting coating preparation on titanium alloy base material; When selecting Ti 3when Al is as flame-retardant layer, on titanium alloy base material, the method for laser melting coating is first adopted to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then laser melting coating Ti 3al flame-retardant layer, thickness is 0.2 ~ 0.5mm; When selecting TiAl as flame-retardant layer, first on titanium alloy base material, adopt the method for laser melting coating to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then preheating is carried out to titanium alloy base material, when preheating temperature reaches 750 DEG C, adopt laser cladding method to prepare TiAl flame-retardant layer on Ti2AlNb transition layer, thickness is 0.2 ~ 0.5mm;
(4) after prepared by flame-retardant layer, under Ar gas shielded or vacuum environment, the process of whole removing stress annealing is carried out, annealing region: 650 DEG C ~ 850 DEG C, furnace cooling.
Specific examples one
Laser melting coating is adopted to prepare Ti2AlNb flame-retardant layer at TC4 titanium alloy ring inwall
The preparation of 1.TC4 titanium alloy ring and Ti2AlNb powder
Processing TC4 titanium alloy ring, be of a size of Ф 300mm × 150mm × 5mm, adopt centrifugal powder process mode to prepare Ti2AlNb powder, powdered ingredients Ti-22Al-25Nb, granularity is 150 order ~ 325 orders.
2. flame-retardant layer preparation and stress relief annealing
(1) prepare front surface cleaning, use wire wheel TC4 titanium alloy ring inwall is polished, remove surface film oxide, metal background color is exposed in visual inspection, then with acetone by whole ring scrub;
(2) titanium alloy ring is arranged on 6KW optical-fiber laser Three-dimension process system rotary table, select rational laser melting coating parameter, at TC4 titanium alloy ring inwall direct cladding Ti2AlNb fire retardant material, prepare flame-retardant layer thickness 0.5mm, thickness in monolayer 0.25mm;
(3) after prepared by flame-retardant layer, in a vacuum furnace, the process of whole removing stress annealing is carried out, annealing schedule: 700 DEG C × 1h, furnace cooling.
Specific examples two
Laser melting coating is adopted to prepare Ti on TC4 titanium alloy substrate 3al flame-retardant layer
1.TC4 titanium alloy substrate and Ti2AlNb powder and Ti 3the preparation of Al powder
Processing TC4 titanium alloy substrate, is of a size of 500mm × 500mm × 5mm, adopts centrifugal powder process mode to prepare Ti2AlNb powder and Ti 3al powder, powdered ingredients is respectively Ti-22Al-25Nb and Ti-24Al-11Nb, and granularity is 150 order ~ 325 orders.
2. flame-retardant layer preparation and stress relief annealing
(1) prepare front surface cleaning, use wire wheel to polish to TC4 titanium alloy substrate, remove surface film oxide, metal background color is exposed in visual inspection, then uses acetone scrub;
(2) titanium alloy substrate is fixed on 6KW optical-fiber laser Three-dimension process system works platform, select rational laser melting coating parameter, first on TC4 base material, the method for laser melting coating is adopted to prepare the thick Ti2AlNb of one deck 0.5mm as intermediate layer, then laser melting coating Ti on Ti2AlNb layer 3al flame-retardant layer, prepares flame-retardant layer thickness 0.5mm;
(3) after prepared by flame-retardant layer, in a vacuum furnace, the process of whole removing stress annealing is carried out, annealing region: 700 DEG C × 1h, furnace cooling.
Embodiment three
Laser melting coating is adopted to prepare TiAl flame-retardant layer on TC4 titanium alloy substrate
The preparation of 1.TC4 titanium alloy substrate and Ti2AlNb powder and TiAl powder
Processing TC4 titanium alloy substrate, be of a size of 100mm × 100mm × 15mm, adopt centrifugal powder process mode to prepare Ti2AlNb powder and TiAl powder, powdered ingredients is respectively Ti-22Al-25Nb and Ti-25Al-2Nb, and granularity is 150 order ~ 325 orders.
Flame-retardant layer preparation and stress relief annealing
(1) prepare front surface cleaning, use wire wheel to polish to TC4 titanium alloy substrate, remove surface film oxide, metal background color is exposed in visual inspection, then uses acetone scrub;
(2) titanium alloy substrate is fixed on 6KW optical-fiber laser Three-dimension process system works platform, select rational laser melting coating parameter, first on TC4 base material, adopt the method for laser melting coating to prepare the thick Ti2AlNb of one deck 0.5mm as intermediate layer, then preheating is carried out to titanium alloy base material, when preheating temperature reaches 750 DEG C, adopt laser cladding method to prepare TiAl flame-retardant layer on Ti2AlNb transition layer, thickness is 0.5mm;
(3) after prepared by flame-retardant layer, in a vacuum furnace, the process of whole removing stress annealing is carried out, annealing region: 815 DEG C × 1h, furnace cooling.
Compared with prior art, the TiAl base intermetallic compound flame-retardant layer flawless defect adopting technical solution of the present invention to prepare on TC4 titanium alloy, can significantly improve the flame-retarding characteristic of TC4 material, and process operation is convenient, and process stabilizing is reproducible, technology maturation.Can extensively promote.

Claims (1)

1. on titanium alloy, prepare a laser manufacture method for TiAl-base alloy gradient fire retardant material, it is characterized in that: the step of the method is:
(1) prepare flame-retardant layer material, flame-retardant layer material is TiAl, Ti2AlNb or Ti 3al, adopts the powder process of centrifugal powder process mode, and granularity is 150 order ~ 325 orders;
(2) method of laser melting coating is adopted to prepare TiAl, Ti2AlNb or Ti on titanium alloy base material 3al fire retardant material; When adopting Ti2AlNb as flame-retardant layer, directly on titanium alloy base material, carry out laser melting coating preparation; When selecting Ti 3when Al is as flame-retardant layer, on titanium alloy base material, the method for laser melting coating is first adopted to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then laser melting coating Ti 3al flame-retardant layer, thickness is 0.2 ~ 0.5mm; When selecting TiAl as flame-retardant layer, first on titanium alloy base material, adopt the method for laser melting coating to prepare the Ti2AlNb of one deck 0.2 ~ 0.5mm as intermediate layer, then preheating is carried out to titanium alloy base material, when preheating temperature reaches 750 DEG C, adopt laser cladding method to prepare TiAl flame-retardant layer on Ti2AlNb transition layer, thickness is 0.2 ~ 0.5mm;
(3) after prepared by flame-retardant layer, under Ar gas shielded or vacuum environment, the process of whole removing stress annealing is carried out, annealing region: 650 DEG C ~ 850 DEG C.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518139A (en) * 2018-12-13 2019-03-26 北京金轮坤天特种机械有限公司 A kind of titanium fire flame retardant coating and preparation method thereof
CN111230113A (en) * 2020-02-28 2020-06-05 沈阳工业大学 Method for preparing TC4/TiAl gradient material by synchronously feeding powder through laser
CN114635132A (en) * 2022-05-17 2022-06-17 北京煜鼎增材制造研究院有限公司 Titanium fire-resistant coating of titanium alloy and preparation method thereof

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JPH06145848A (en) * 1992-11-16 1994-05-27 Nhk Spring Co Ltd Ti-al intermetallic compound

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518139A (en) * 2018-12-13 2019-03-26 北京金轮坤天特种机械有限公司 A kind of titanium fire flame retardant coating and preparation method thereof
CN109518139B (en) * 2018-12-13 2021-02-26 北京金轮坤天特种机械有限公司 Titanium fire flame-retardant coating and preparation method thereof
CN111230113A (en) * 2020-02-28 2020-06-05 沈阳工业大学 Method for preparing TC4/TiAl gradient material by synchronously feeding powder through laser
CN114635132A (en) * 2022-05-17 2022-06-17 北京煜鼎增材制造研究院有限公司 Titanium fire-resistant coating of titanium alloy and preparation method thereof
CN114635132B (en) * 2022-05-17 2022-08-02 北京煜鼎增材制造研究院有限公司 Titanium fire-resistant coating of titanium alloy and preparation method thereof

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