Research on Mechanically Assisted Aluminizing Technology of Precipitation Hardening Stainless Steel
[China Aluminum Network] Precipitation-hardening stainless steel is widely used in aerospace as a key structural component for bearing capacity, heat resistance and corrosion resistance due to its high strength and toughness and low stress concentration sensitivity under dynamic and static loads. . However, in its service environment, precipitation-hardening stainless steels often result in reduced material life due to insufficient wear and corrosion resistance, and must be surface treated to improve material properties. Aluminizing is one of the more effective and practical methods. After the steel is aluminized, the surface can form a dense alumina film, which can greatly improve the wear resistance, corrosion resistance and oxidation resistance of the material. It is widely used in the petrochemical, metallurgy and aviation industries. Since precipitation hardening stainless steels generally have aging temperatures below 600°C, commonly used aluminizing processes such as solid aluminizing and hot dipping aluminizing have higher isotherm temperatures than 600°C, which can lead to changes in the mechanical properties of the matrix material, in order not to change the matrix material. The mechanical properties must be low temperature aluminizing. Physical vapor deposition (PVD) aluminizing process can realize low-temperature aluminizing (aluminizing temperature of about 400°C), but its disadvantages such as poor adhesion of the penetrating layer and expensive equipment restrict its application. Mechanical energy assisted infiltration of aluminum as an effective low-temperature aluminizing process, because it can reduce the temperature of aluminizing and shorten the time of aluminizing, has been valued by many scientific researchers. For the early research of mechanical energy-assisted infiltration of aluminum, most low-carbon steels are used for aluminizing. However, low-temperature aluminizing of stainless steel, especially precipitation-hardened stainless steel, has rarely been reported. In this paper, the mechanically energy-assisted aluminizing process was used to aluminize the precipitation-hardening stainless steel at 500°C. Under the condition that the mechanical properties of the matrix material were basically free from loss, the hardness was twice that of the matrix. A 1Cr14Ni4Mo3N precipitation hardened stainless steel specimen with a Φ20 mm×3 mm sheet and a standard tensile (φ5 mm) and impact (10 mm×10 mm×55 mm) was used. The seepage agent used in the experiment was mainly composed of aluminum powder, aluminum iron powder, alumina and ammonium chloride. Prior to the experiment, the specimens were sequentially sanded, alkali washed, pickled, washed, blow dried, and then placed evenly in the drum together with the osmotic agent, sealed and sealed in an electric furnace with protective atmosphere of RG2-6-6. Heated to 500 °C, heat 8-12h, the furnace is cooled to below 300 °C when the percolator out of air cooling, and then washed and dried. By mechanically assisting the infiltration of aluminum, the precipitation hardened stainless steel was annealed at 500° C.×10 h to obtain an aluminized layer with a thickness of 11 μm. The hardness of the aluminized layer is more than twice that of the matrix. The mechanical energy-assisted aluminizing process does not change the mechanical properties of the matrix material. Pe Plastic Sheet, full name is Polyethylene Sheet.
Physical properties: PE plastic Sheet is the most simple structure of the macromolecular organic compounds, the world's most widely used polymer materials, composed of ethylene polymerization, depending on the density is divided into high density polyethylene, medium density polyethylene and low density polyethylene.
(5) UHMWPE Sheet
Ultra high molecular weight polyethylene is very strong and can be used for body armor.
7. Wharf: anti-collision board.
Color: natural color is wax white, also can be customized black and color, the order of the color to order is 500KG.
Combustion characteristics:
Combustion flame status: molten drop, yellow lower blue
After the fire: continue to bur
Smell: the smell of wax burning
Product certification: most environmental certification reports and safety reports for raw materials, such as SGS report, CTI report, UL report, MSDS safety information, etc.
Pe Plastic Sheet,White Pe Plate,Standard Material Pe Plastic,Transparent Pe Plastic Sheet Dongguan Noegem Plastic Products Co.,Ltd , http://www.noegempLastic.com
(1) LDPE Sheet
Low density polyethylene Sheet (also known as high pressure polyethylene Sheet)
(2) LLDPE Sheet
Linear low density polyethylene
(3) MDPE Sheet
Medium density polyethylene
(4) HDPE Sheet
High density polyethylene (also known as low pressure polyethylene)
(6)Modified polyethylene sheet
Chlorinated polyethylene (CPE) and crosslinked polyethylene (PEX)
(7)Ethylene - ethylene copolymer
Ethylene/propylene copolymer (plastic), EVA, ethylene, ethylene butene copolymer - other olefins, such as octene POE, cyclic olefin copolymer, ethylene/unsaturated ester copolymer (EAA, EMAA, EEA, EMA, EMMA, EMAH).
Polyethylene, which has a molecular weight of 3 million to 6 million, is known as UHMWPE.
1. Papermaking industry: suction box board, scraper, molding plate, bearing, gear;
2. Mining industry: charging barrel, abrasive and adhesive-resistant back lining for warehouses;
3. Chemical industry: acid pump, filter plate, worm gear, bearing;
4. Food industry: packing machinery parts, bottle guide, screw, wear plate, slide way, stud weld, roller and other transmission parts;
5. Textile industry:buffer board;
6. Food processing industry: chopping block, refrigerating plant;
1. Acid and alkali resistance, resistance to organic solvents
2. Excellent electrical insulation and static resistance
3, Can still maintain a certain touness even at low temperature
4. Extremely high impact strength
5. Low friction coefficient
6. Non-toxic
7. Low water absorption
8.Lower density than any other thermoplastic plastics (<1g/cm3)
Disadvantages:
PE Plastic sheet have Weak mechanical property, air permeability, easy deformation, easy ageing, brittle, brittle less than PP, easy stress cracking, surface hardness, easy to scratch.
Difficult to print, in printing, surface discharge treatment, cannot electroplating, the surface has no luster.
Specification: the diameter of the PE rod can be produced from 2mm to 250mm. The conventional length is 1000mm, and the length is unlimited.
The thickness of PE sheet material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width cannot exceed 1200mm, the length is not limited.
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 1000mm* 2000mm, and the commonly used specification of10-180mm is 600*1200mm.PE sheet can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited
Add antistatic agent to the permanent antistatic electric bar, and the volume resistance value is between 6 to 9 power of 10.Add flame retardant to the flame retardant rod from UL 94V-0 to HB flame retardant grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.