tailieunhanh - Handbook Heat Treating (1991) WW Part 15

Tham khảo tài liệu 'handbook heat treating (1991) ww part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Billet is preheated in molten salt bath at 630 C 1165 F and extruded Extruded billet is machined into blank that is solution heat treated at 800 C 1475 F for 8 h in vacuum and water quenched Blank is aged at 385 C 725 F for h in argon and water quenched Example 2 . Bars of alloy 36 mm in. in diameter are to be heat treated to the following specifications hardness 38 to 44 HRC minimum yield strength 725 MPa 105 ksi minimum elongation 12 and maximum hydrogen content 1 ppm. The procedure is to Cut extruded bar stock to length Pickle in 1 1 nitric acid to remove copper sheath Rinse and air dry Place rods vertically in a basket Solution treat 2 2 h at 850 C 1560 F in a vacuum of 7 X 10-3 Pa 5 X 10-5 torr or better Quench into circulating water at 455 mm min 18 in. min Air dry Age 16 h at 350 C 660 F in an inert gas recirculating furnace Example 3 U-6Nb Alloy. A U-6 Nb alloy is to be formed into a hemisphere with the following mechanical properties ultimate tensile strength 770 MPa 112 ksi min yield strength at offset 360 to 485 MPa 52 to 70 ksi and total elongation 25 min. Billet is preheated to 800 to 850 C 1475 to 1560 F and forged Forged billet is homogenized at 1000 C 1830 F for 4 h in vacuum Forged billet is preheated to 850 C 1560 F in molten salt bath and cross rolled into plate Plate is preheated in argon furnace to 850 C 1560 F and formed into a hemisphere Hemisphere is solution heat treated to 800 C 1475 F for 1 to 2 h in vacuum and water quenched Hemisphere is aged in argon at 200 C 400 F for 2 h References cited in this section 5. . Eckelmeyer . Romig Jr. and . Weirick The Effect of Quench Rate on the Microstructure Mechanical Properties and Corrosion Behavior of U-6 Wt. Pct. Nb Met. Trans. A Vol 15A 1984 p 1319 6. . Eckelmeyer and . Zanner The Effect of Aging on the Mechanical Behavior of wt. Ti and wt. Mo J. Nucl. Mater. Vol 62 1976 p 37 7. . Llewellyn . Aramayo M. Siman-Tov . Childs .

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