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sinter hardening

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Published: 30 September 2015
Fig. 21 Surface of a sinter-hardening alloy after accelerated cooling. The majority of the microstructure is martensite with the small, angular, white features of retained austenite located at particle and grain boundaries. Etched with 2 vol% nital plus 4 wt% picral, then 25 wt% sodium More
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Published: 01 October 2014
Fig. 3 Typical pore structure in sinter-hardened; 737SH; netched More
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Published: 01 October 2014
Fig. 24 Comparison of hardnesses of vacuum sinter-hardened materials with wrought steel. Source: Ref 26 More
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006111
EISBN: 978-1-62708-175-7
... of iron and iron-graphite powder, iron-copper and iron-copper graphite, and alloy steels. The effects of various sinter conditions on the amount of combined carbon formed in the steel are also discussed. The article concludes with information on high-temperature sintering and sinter hardening. alloy...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005971
EISBN: 978-1-62708-168-9
... Abstract Powder metallurgy (PM) processes include press and sinter hardening, metal injection molding, powder forging, hot isostatic pressing, powder rolling, and spray forming. This article provides an overview of PM processing methods and general considerations of heat treatment of PM parts...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006101
EISBN: 978-1-62708-175-7
... occurs with increasing sintering temperature and time; large pores grow at the expense of smaller pores. Increased time and temperature also lead to reduced irregularity of pore shape. Certain applications require supplemental alloy additions via admixing to enhance hardenability and mechanical...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003112
EISBN: 978-1-62708-199-3
...%, and the carbon content is reduced to about 0.01%. At the same time, the powder softens through annealing. Subsequent hammer milling of the sinter cake restores the original as-atomized particle size distribution, with only moderate work hardening of the resultant powder. Sieving and blending follow standard...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006081
EISBN: 978-1-62708-175-7
... ranging from 0.3 to 1.5%: These are versatile alloys that can be used for PM parts that are heat treated and, in some cases, admixed with other elements to partially sinter harden. Fe-Ni-Mo alloys containing both prealloyed nickel and molybdenum with a small amount of manganese: These alloys were...
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Published: 30 September 2015
-hardened and tempered condition. (c) Nickel steels and diffusion-alloyed steels in the as-sintered condition. (d) Nickel steels and diffusion-alloyed steels in the quenched-hardened and tempered condition. (e) Prealloyed materials in the as-sintered condition. (f) Prealloyed materials in the quench More
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006103
EISBN: 978-1-62708-175-7
... 14 ). These PM steels possess significantly higher mechanical properties due to their much higher hardenability. Consequently, they possess bainitic or partially martensitic microstructures in the sintered condition with tensile strengths of 415 to 690 MPa (60 to 100 ksi). Alloys of this type can...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006083
EISBN: 978-1-62708-175-7
... punches) and allowing the same component to be compacted on a smaller compaction press. This higher green density observed with higher compressibility is also observed with iron powders having lower compressibility, specifically sinter-hardening materials. Generally, an increase in green density of ∼0.1...
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Published: 01 December 1998
Fig. 17 Effect of porosity on hardenability. Compacts of F-0008 powder were pressed and sintered to various densities, then austenitized and end quenched. Apparent hardness traverses reflect both depth of hardening and density of compacts. Horizontal bars represent approximate distance over More
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Published: 01 January 1990
Fig. 12 Effect of porosity on hardenability. Compacts of F-0008 powder were pressed and sintered to various densities, then austenitized and end quenched. Apparent hardness traverses reflect both depth of hardening and density of compacts. Horizontal bars represent approximate distance over More
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Published: 01 December 1998
Fig. 19 Effect of tempering temperature on the mechanical properties of hardened-and-tempered FN-0205 sintered nickel steel. Specimens were hardened by quenching from 870 °C (1600 °F) and tempering at various temperatures. Tensile data for wrought 4640 steel is included for comparison. More
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003119
EISBN: 978-1-62708-199-3
..., sinter hardened at 1150 °C (2100 °F) in dissociated ammonia to highest strength. (b) The numerical suffix represents the minimum yield strength in ksi. (c) The numerical suffix represents the ultimate tensile strength in ksi. (d) Yield and ultimate tensile strength are approximately the same...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006116
EISBN: 978-1-62708-175-7
... of the powder mixture, the method used to manufacture the base powder, and the sintering conditions of temperature, time, and atmosphere all define the distribution of the alloying additives and consequently, the local alloy hardenability. The section size, cooling rate in the sintering furnace, and any post...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006120
EISBN: 978-1-62708-175-7
... of these grades. In the as-sintered condition, ferritic and austenitic stainless steels, having similar chromium contents, exhibit similar yield and tensile strengths. Cold working leads to significant increases in the tensile and yield strengths of austenitic grades because of their rapid strain hardening...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006119
EISBN: 978-1-62708-175-7
... increase the density of the part or to improve dimensional tolerances, including the correction of any distortion that may have occurred during sintering. Due to the high rate of work hardening, austenitic stainless steels respond poorly to re-pressing. With ferritic PM stainless steels, re-pressing...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006022
EISBN: 978-1-62708-175-7
... hardened during the sinter-brazing phase and has a density of 7.0 g/cm 3 . The assembly also has a doubled-pressed and double-sintered cam plate made to 7.3 g/cm 3 density with an ultimate tensile strength of 1170 MPa (170 ksi) and a mean tempered hardness exceeding 40 HRC. To form the parts and maintain...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002374
EISBN: 978-1-62708-193-1
...-hardenable alloys such as 17-4 PH, yield strengths of 1100 MPa (160 ksi) with 12% elongation are possible with fatigue endurance limits in the 500 MPa range (72 ksi). Alternatively, for austenitic stainless steels such as 316L, a sintered yield strength of 250 MPa (36 ksi) and considerable ductility (30...