Phase Studies in WC-Stainless Steel AISI 347 Hardmetal System with Graphite Addition

In this study, WC-stainless steel AISI 347 hardmetal system was produced to replace WC-Co hardmetal which uses the expensive, toxic and depleted resource Co. WC, stainless steel AISI 347 and graphite powder mixture were milled in a planetary mill under argon atmosphere using a stainless steel container and balls. Carbon was added in amounts ranging from 0 wt% until 4 wt% into the composition to avoid unwanted η (Fe3W3C) phase. As-milled powder was compacted at 300 MPa and sintered in a tube furnace at 1350°C. ɳ phase was detected in compositions with 0 and 1 wt% C addition. For 2 wt% C addition, no η (Fe3W3C) phase formation was identified. However, the η phase was detected for compositions containing 3 and 4 wt% C. Maximum hardness was achieved due to the absence of η phase.

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SURFACE STATE EFFECT OF WELDED STAINLESS STEELS ON CORROSION BEHAVIOR

Acta Metallurgica Slovaca ◽

10.12776/ams.v22i1.627 ◽

2016 ◽

Vol 22 (1) ◽

pp. 44 ◽

Cited By ~ 1

Author(s):

Tatiana Liptáková ◽

Martin Lovíšek ◽

Ayman Alaskari ◽

Branislav Hadzima

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Stainless Steels ◽

Passive Layer ◽

Argon Atmosphere ◽

Oxidation Products ◽

Surface Finishing ◽

Font Size ◽

Steel Aisi ◽

Stainless Steel Aisi

Welding joints of stainless steels are in practice very sensitive places attacked by local corrosion, such as pitting and crevice corrosion, mostly in chloride containing oxidizing environments. It is caused by different oxidation products created on the surface by welding. Corrosion resistance of stainless steels is affected by quality of passive layer (Cr2O3) which created at normal conditions on air. After welding the steels are heated and on the surface are originated different types of oxides which do not have the same protective properties. Resistance to intergranular and pitting corrosion of the welded stainless steels with different surface finishing was tested. Experimental materials are the austenitic stainless steel AISI 316L (welded by the TIG method in inert argon atmosphere with filler) and the ferritic stainless steel AISI CA6-NM (welded by the WPS method in inert argon atmosphere with filler and after welding heat treated). Character of the surface after welding and after finishing by grinding and pickling was evaluated by SEM microscopy, EDX analysis. Corrosion resistance to local forms of corrosion was investigated by electrochemical potentiodynamic test and by exposure tests in chloride solutions. The steel AISI CA6-NM was tested in fluvial water to simulate real operation environment. The evaluation is supported by microscopic analysis. Susceptibility to intergranular corrosion was tested too and results detect the dangerous localities for corrosion attack and show increasing of corrosion resistance by surface treatment.

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AL TECH MIAMI

Alloy Digest ◽

10.31399/asm.ad.ss0435 ◽

1983 ◽

Vol 32 (11) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Heat Treating ◽

Good Resistance ◽

Aisi Type ◽

Steel Aisi ◽

Resistance To Wear ◽

Specialty Steel ◽

Stainless Steel Aisi ◽

Plastic Mold

Abstract AL TECH MIAMI is both a hardenable stainless steel (AISI Type 420) and a tool steel for making molds for plastic. A major requirement for plastic mold steel is corrosion resistance. Certain plastics, such as poly-vinyl chlorides, are very corrosive and stored molds often rust from sweating water lines and/or humid environments. AL TECH MIAMI has good resistance to wear. It is melted and AOD refined to assure the mold-maker of cleanliness and freedom from internal imperfections. It provides exceptionally good polishability for lens-quality molds. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: SS-435. Producer or source: AL Tech Specialty Steel Corporation.

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Influence of Activated Fluxes on the Bead Shape of A-TIG Welds on Carbon and Low-Alloy Steels in Comparison with Stainless Steel AISI 304L

Metals ◽

10.3390/met11040530 ◽

2021 ◽

Vol 11 (4) ◽

pp. 530

Author(s):

Jerzy Niagaj

Keyword(s):

Stainless Steel ◽

Penetration Depth ◽

High Strength ◽

Tig Welding ◽

Low Alloy Steels ◽

Aisi 304L ◽

A Tig Welding ◽

Alloy Steels ◽

Steel Aisi ◽

Stainless Steel Aisi

The article presents results of comparative A-TIG welding tests involving selected unalloyed and fine-grained steels, as well as high-strength steel WELDOX 1300 and austenitic stainless steel AISI 304L. The tests involved the use of single ingredient activated fluxes (Cr2O3, TiO2, SiO2, Fe2O3, NaF, and AlF3). In cases of carbon and low-alloy steels, the tests revealed that the greatest increase in penetration depth was observed in the steels which had been well deoxidized and purified during their production in steelworks. The tests revealed that among the activated fluxes, the TiO2 and SiO2 oxides always led to an increase in penetration depth during A-TIG welding, regardless of the type and grade of steel. The degree of the aforesaid increase was restricted within the range of 30% to more than 200%.

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Optimization of Grinding Parameters in Austenitic Stainless Steel AISI 317l using Taguchi Method

SSRN Electronic Journal ◽

10.2139/ssrn.3275153 ◽

2018 ◽

Author(s):

B Sivaraman ◽

Sivakumar R

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Taguchi Method ◽

Grinding Parameters ◽

Steel Aisi ◽

Stainless Steel Aisi

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Experimental characterization and computerbased description of the carburization behaviour of the austenitic stainless steel AISI 304L

Materials and Corrosion ◽

10.1002/(sici)1521-4176(199804)49:4<258::aid-maco258>3.0.co;2-u ◽

1998 ◽

Vol 49 (4) ◽

pp. 258-265 ◽

Cited By ~ 21

Author(s):

H.-J. Christ

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Experimental Characterization ◽

Aisi 304L ◽

Steel Aisi ◽

Stainless Steel Aisi

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Residual Stress Analysis in Deep Rolling Process on Gas Tungsten Arc Weld of Stainless Steel AISI 316L

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.880.23 ◽

2021 ◽

Vol 880 ◽

pp. 23-28

Author(s):

Warinthorn Thanakulwattana ◽

Wasawat Nakkiew

Keyword(s):

Residual Stress ◽

Stainless Steel ◽

Surface Layer ◽

Compressive Residual Stress ◽

Aisi 316L ◽

Deep Rolling ◽

Gas Tungsten Arc ◽

Steel Aisi ◽

Gas Tungsten ◽

Stainless Steel Aisi

Because of the general problem of the welding workpiece such as fatigue fracture caused by tensile residual stress lead to initial and propagation crack in the fusion zone. Thus, the mechanical surface treatment of deep rolling on Gas Tungsten Arc Welded (GTAW) surfaces of AISI 316L was studied. Deep rolling (DR) is a cold working process to induce compressive residual stress in the surface layer of the workpiece resulting in hardening deformation which increased surface hardness, and smooth surface that inhibit crack growth and improve fracture strength of materials. The present study focuses on compressive residual stress at the surface of stainless steel AISI 316L butt welded joint of GTAW. The three parameters of DR process were used; pressure 150 bar, rolling speed 400 mm/min, and step over 1.0 mm. The residual stresses analysis by X-ray diffraction with sin2Ψ method at 0, 5, 10, and 20 mm from the center of the welded bead. The results showed that the DR process on the welded of GTAW induce the minimum compressive residual stress-408.6 MPa and maximum-498.1 MPa in longitudinal direction. The results of transverse residual stress in minimum and maximum are 43.7 MPa and-34.8 MPa respectively. The FWHM of DR both longitudinal and transverse direction were increased in the same trend. Furthermore, the microhardness after DR treatment on workpiece surface layer higher than GTAW average 0.4 times.

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