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A Superior Sinter-Hardenable Material

Publisher: Hoeganaes Corp.
Overview:
This paper attempts to study Ancorsteel 737 SH, a new sinter-hardenable alloy, which provides improvements in hardenability and compressibility over FLC-4608 composition. How these improvements allow P/M parts fabricators to reach higher densities and mechanical performance under typical compaction and sintering conditions is also examined. The role of density in material composition and microstructure, P/M performance, and material design are detailed together and a table depicting the qualitative ranking of alloying elements in prealloyed materials is also included. the paper also reviews the effect of copper and graphite additions on Ancorsteel 737 SH premixes, compares green and sintered properties of premixes, and details mechanical properties of select Ancorsteel 737 SH Premixes. Effect of tempering temperature on the apparent hardness and impact properties of several Ancorsteel 737 SH premixes is presented both in graphical and tabular forms.
TABLE OF CONTENTS
1.Abstract1
2.Background1-2
3.Introduction2-4
3.1Density2
3.2Composition and Microstructure2-3
3.3Material Design3-4
3.4Overall Alloying Effects Study4
4.Experimental Procedure4-7
4.1Effect of Copper and Graphite Additions4-5
4.2Premix Refinement6
4.3Impact/Temper Study6
4.4ANCORDENSE Processing6
4.5Metallography7
5.Results and Discussion
5.1Effect of Copper and Graphite Additions7-9
5.2Premix Refinement9-10
5.3Impact/Temper Study10-12
5.4ANCORDENSE Processing13
5.5Metallography13-17
6.Conclusions18
7.Acknowledgements19
8.References19
9.Tables4-14
9.1Qualitative Ranking of Alloying Elements in Prealloyed Materials4
9.2Premix Compositions for Part I5
9.3Premix Compositions for Part II6
9.4ANCORDENSE Premix Compositions6
9.5Ancorsteel 737 SH Premix Compositions with Varied Copper and Graphite Additions8
9.6Comparison of the Green and Sintered Properties of Premixes9
9.7Mechanical Properties of Select Ancorsteel 737 SH Premixes10
9.8Apparent Hardness and Impact Energy at Various Tempering Temperatures
for Select Ancorsteel 737 SH Premixes11
9.9ANCORDENSE Properties of Ancorsteel 737 SH Premixes14
10Figures9-18
10.1Transverse Rupture Strength as Function of Sintered Carbon Content for
Specimens Compacted at 40 tsi9
10.2The Effect of Tempering Temperature on Apparent Hardness12
10.3The Effect of Tempering Temperature on Impact Energy12
10.4Microstructure of a Sample Produced from Premix #1-1 (0.5 w/o Graphite).
Etched with 1% Nital/4% Picral15
10.5Microstructure of a Sample Produced from Premix #1-5 (1 w/o Copper - 0.7 w/o
Graphite). Etched with 1% Nital/4% Picral15
10.6Microstructure of a Sample Produced from Premix #1-9 (2 w/o Copper - 0.9 w/o
Graphite). Etched with 1% Nital/4% Picral16
10.7Microstructure of Premix #2-1 (0.8 w/o Graphite). Original Magnification 500X.
No Retained Austenite Present16
10.8Microstructure of Premix #2-2 (1 w/o Copper - 0.7 w/o Graphite). Original
Magnification 500X17
10.9Microstructure of Premix #2-3 (1.5 w/o Copper - 0.8 w/o Graphite). Original
Magnification 500X17
10.10Microstructure of Premix #2-4 (2.0 w/o Copper - 0.9 w/o Graphite). Original
Magnification 500X18
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