Handbook Heat Treating (1991) WW Part 15 potx

... 815- 845 150 0 -155 0 4617 815- 845 150 0 -155 0 4620 815- 845 150 0 -155 0 4621 815- 845 150 0 -155 0 4626 815- 845 150 0 -155 0 4718 815- 845 150 0 -155 0 4720 815- 845 ... 830-855 152 5 -157 5 1138 815- 845 150 0 -155 0 1140 815- 845 150 0 -155 0 1141 800-845 1475 -155 0 1144 800-845 1475 -155 0 1145 800-845 1475 -155 0...

Ngày tải lên: 11/08/2014, 04:21

... 4.2 (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 heating) ... 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 n...

Ngày tải lên: 11/08/2014, 04:21

... Full 8.0-9.5 10 1175 2150 Full 5.0-5.5 20 1175 2150 Full 6.0-6.5 30 1175 2150 Full 4.5-6.5 40 1175 2150 Full 4.5-6.5 50 1175 2150 Full 5.5-6.0 Fig. ... + 845 °C (155 0 °F)/16/AC Udimet 500 1150 °C (2100 °F)/4/AC + 1080 °C (1975 °F)/4/AC + 760 °C (1400 °F)/16/AC Udimet 700 1175 °C ( 2150 °F)/4/AC + 1080 °C (1975 °F)/4/AC + 845 °C (155 0 °...

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 ... when parts are exposed to temperatures in the critical range for rather long times and is a concern for parts exposed to these temperatures while in service or when heat treating ver...

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

... other parts whose geometries were not so simple. Most recently, induction hardening and tempering techniques have been developed for purposes of heat treating to large case depths and heat treating ... furnace cooling from 815 to 845 °C (150 0 to 155 0 °F) to about 540 °C (1000 °F). These treatments impart moderately hard microstructures suitable for machining. If blanks for par...

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

... 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, ... finished results. Fig. 15 Calculated CCT diagram from actual part composition with modeled part cooling rates. Ac 1 : temperature at which austenite begins to form during heating. A...

Ngày tải lên: 11/08/2014, 04:21

... 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