Handbook Heat Treating (1991) WW Part 11 doc

... recommended. Simple shapes and fully pearlitic castings can be heated at faster rates. The heating rate can be accelerated above red heat. Fig. 14 Heat treatment schedule for hardening high-chromium ... Ni-Hard 4, was performed by supercritical heat treatment when as-cast hardness was insufficient. An austenitizing heat treatment usually comprised heating at temperatures between...

Ngày tải lên: 11/08/2014, 04:21

... heat transfer coefficient is defined as: (Eq 1) where h is the interface heat transfer coefficient; q is the heat flow from the part to the quenchant; A is the part area; T 1 is the part ... Heat Transfer during Quenching. Heat removal from parts during quenching can be mathematically described in terms of the effective interface heat transfer coefficient. A quencha...

Ngày tải lên: 11/08/2014, 04:21

... of defects in heat- treated parts and the use of computer programs for designing heat- treat operations and predicting the properties of heat- treated steels. Because the heat- treating industry ... rather long times and is a concern for parts exposed to these temperatures while in service or when heat treating very massive parts which require long times to heat and cool. It...

Ngày tải lên: 11/08/2014, 04:21

... relieving 595 (110 0) 595 (110 0) 595 (110 0) 595 (110 0) 595 (110 0) 280 (500) 290 (550) 370 (700) Table 10 Typical operating conditions for progressive through-hardening of steel parts by induction ... 1.8 75 165 620 115 0 113 250 0.062 0.40 19 3 4 1035 mod 9600 20.6 28.8 0.71 1.8 620 115 0 955 1750 113 250 0.085 0.55 180 33 98.8 1.02 2.6 70 160 620 115 0 141...

Ngày tải lên: 11/08/2014, 04:21

... the ASM Committee on Vacuum Heat Treating * Introduction VACUUM HEAT TREATING consists of thermally treating metals in heated enclosures that are evacuated to partial pressures compatible ... vessel is heated by external heating elements in the hot-wall construction. The heat is contained by insulation materials similar to the materials used in electrically heated heat- t...

Ngày tải lên: 11/08/2014, 04:21

... management attention and planning, particularly in heat- treating operations that have had their energy supplies curtailed. In the past, heat- treating operations required a supply of natural gas, ... (150) High -heat furnace Open chamber, electrically heated; front push, rear pull Size of hearth, mm (in.) 255 by 610 (10 by 24) (preheating) 255 by 915 mm (10 by 36 in.) (high hea...

Ngày tải lên: 11/08/2014, 04:21

... factors for three heats to induction harden a 34 .11 mm (1.343 in.) yoke- spline 1040 steel shaft per Table 3 specifications Process conditions Process factor Heat 1 Heat 2 Heat 3 Scan speed, ... high-speed steels at 600 to 750 °C (111 0 to 1380 °F), and the heavily machined or large parts at 650 °C (1200 °F) (for 4 h) prior to final machining and heat- treatment operations. Subre...

Ngày tải lên: 11/08/2014, 04:21

... 8.5-10.0 10 112 0 2050 Full 5.0-5.5 20 112 0 2050 Full 7.5-8.5 30 112 0 2050 Full 7.0-7.5 40 112 0 2050 Full 7.5-9.0 50 112 0 2050 Full 8.0-9.5 10 117 5 2150 ... 8.0-9.5 10 117 5 2150 Full 5.0-5.5 20 117 5 2150 Full 6.0-6.5 30 117 5 2150 Full 4.5-6.5 40 117 5 2150 Full 4.5-6.5 50 117 5 2150 Full 5....

Ngày tải lên: 11/08/2014, 04:21