D3. Consider the following heat treatments for a 1-inch diameter 1015 steel rod: D3.1 • Fully austenitize the steel and

[answerhappygod]

D3 Consider The Following Heat Treatments For A 1 Inch Diameter 1015 Steel Rod D3 1 Fully Austenitize The Steel And 1 (93.42 KiB) Viewed 42 times

D3 Consider The Following Heat Treatments For A 1 Inch Diameter 1015 Steel Rod D3 1 Fully Austenitize The Steel And 2 (174.92 KiB) Viewed 42 times

D3. Consider the following heat treatments for a 1-inch diameter 1015 steel rod: D3.1 • Fully austenitize the steel and then cool it down at 10°C /sec to 400°C. • Quench the steel in the oil to room temperature (1) What phases are present in the rod? (ii) What is the hardness (or hardness distribution) of the rod? D3.2 • Increase the rod temperature again to 850°C to prepare for carburizing • Carburize for 2 hours and then quench in oil (H = 0.5) (1) What is the approximate surface hardness? Explain. (ii) 70 Sketch the hardness distribution from the surface to the center of the rod (by Inches) 170 160 60 50 50 HRC 40 40 30 30 20 Surface o 0.1 0.2 0,3 (inches) 120 0.5 Center 0.4
Charts for D3 70 900 TIPIT 4340 800 Fs 700 Р. 50 600 В. Pf Rockwell C hardness 500 B 40 TITIL M Temperature (C) 8640 9310 1080 400 30 300 100'CS 20'C's 10°C 2°Cls 200 4320 1050 20 1015 100 0 0 30 10 10- 10 10 20 Jominy distance (1 th of an inch) Fig. 1 Jominy Distance results 이 Time (s) Fig. 2 CCT diagram of 1015 Steel 2.5 0.8 2.0 0.7 H= 5.0 0.6 5 hrs H = 1.0 0.5 Diameter of bar (in.) H=0.5 2 hrs WEIGIT-PERCENTC 0.4 1.0 0.3 30 min H = 0.2 5 min 0.2 0.5 0.1 و فانتو 1.9 mm 1.5 mm ww O'Z 0 O O 10 12 14 16 20 12 7 to f Jominy distance (in.) Fig. 3 Grossman Chart Fig. 4 Concentration profile of carbon in carburization of 1015 steel Table 1. Conversion table of Jominy distance to cooling rate 1/16 2/16 3/16 4/16 5/16 6/16 7/16 8/16 10/16 12/16 Jominy dist. (In.) Cooling rate ("C/s) 315 110 50 36 28 22 17 15 10 8