Phase transformational kinetics and hardenability of alloyed medium-carbon steels
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on the kinetics of austenite t r a n s f o r m a t i o n s and h a r d e n ability of m e d i u m - c a r b o n s t e e l s : 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16)
0.39 pct 0.39 pct 0.35 pct 0.41 pct 0.37 pct 0.36 pct 0.36 pct 0.37 pct 0.36 pct 0.38 pct pet Cr, 0.37 pct 0.39 pct 0.40 pct 0.40 pct 0.40 pct 0.40 pct pct Cr.
C-0.3 C-0.3 C-0.3 C-0.3 C-0.3 C-0.3 C-0.3 C-0.3 C-0.3 C-0.3
pct pct pct pct pct pct pct pct pct pet
Si-0.8 Si-l.4 Si-0.8 Si-0.8 Si-0.8 Si-0.8 Si-0.8 Si-0.8 Si-0.8 Si-0.8
pct pct pct pct pct pct pct pct pct pct
Mn, Mn, Mn-0.3 Mn-0.3 Mn-0.7 Mn-l.5 Mn-0.7 Mn-l.4 Mn-2.6 Mn-l.4
C-0.3 C-1.5 C-1.5 C-1.5 C-1.5 C-1.5
pct pct pct pct pct pct
Si-l.4 Si-0.8 Si-l.4 Si-0.8 Si-l.4 Si-l.4
pet pct pct pct pct pct
Mn-0.7 Mn, Mn, Mn-0.7 Mn-0.7 Mn-l.4
pct pct pct pct pct pct pet pct
Cr, Cr, Cr, Cr, Ni, Ni, Ni, Ni-0.7
pet Cr,
pct Cr, pct Cr, and pct Ni-0.7
The s t e e l s of the above alloy b a s e s were p r e p a r e d at nominal molybdenum levels of 0.0, 0.25, 0.5, and 0.75 pet. The chemical compositions of the r e s u l t i n g s i x t y four s t e e l s a r e shown in Table L The base s t e e l s were induction a i r - m e l t e d as 25 kg (55 lb) heats. F o u r ingots were cast from each b a s e - s t e e l melt, each after a composition adjustment to produce the molybdenum contents noted above. Armco iron was used as the base charge m a t e r i a l . Additions were pure graphite, f e r r o silicon, f e r r o m a n g a n e s e , f e r r o c h r o m i u m , carbonyl nickel p e l l e t s , ferromolybdenum, and aluminum. The ingots were cropped, hot-forged to 30 mm (188 in.) diam b a r stock, austenitized at 870~ (1600~ for 1 h, and a i r cooled. VOLUME 4, OCTOBER 1o73-2257
Table I. Chemical Compositions of the Experimental Steels Nominal Molybdenum Steel Base
Content, pct
Element, pct C
SI
Mn
P
S
Ni
Cr
Mo
-
0.01 0.26 0.53 0.79
0.39 pct C-0.3 pct Si-0.8 pct Mn
0 0.25 0.50 0.75
0.40 0.38 0.40 0.40
0.34 0.32 0.35 0.33
0.83 0.82 0.82 0.80
0.025 0.025 0.025 0.025
0.021 0.021 0.021 0.021
0.39 pct C-0.3 pct $1-1.4 pct Mn
0 0.25 0.50 0,75
0.39 0.40 0.39 0.38
0.36 0.37 0.37 0.36
1.46 1.47 1.45 1.45
0.024 0.024 0.024 0.024
0.019 0.019 0.019 0,019
-
0.3 pct C-0.3 pct $1-0.8 pct Mn-0.3 pct Cr
0 0.25 0.50 0.75
0.36 0.35 0.35 0.34
0.38 0.39 0.38 0.38
0.83 0.83 0.80 0.80
0.025 0.025 0.025 0.025
0,020 0.020 0.020 0,020
-
0.34 0.35 0.35 0.34
0.01 0.24 0.51 0.78
0.41 pct C-0.3 pct St-0.8 pct Mn-0.3 pct Cr
0 0.25 0,50 0.75
0.41 0.40 0,41 0.41
0.36 0.36 0,35 0.34
0.86 0.87 0,84 0.84
0.023 0,023 0.023 0.023
0.018 0.018 0.018 0.018
-
0.33 0.34 0.35 0.35
0.01 0.25 0.49 0.77
0.37 pct C-0.3 pct $1-0.8 pct Mn-0.7 pct Cr
0 0.25 0.50 0.75
0.37 0.37 0.37 0.37
0.37 0.39 0.37 0.36
0.85 0.85 0.84 0.82
0,025 0.025 0.025 0.025
0.022 0.022 0.022 0.022
-
0.74 0.73 0.74 0.73
0.02 0.26 0.50 0.76
0 0.25 0.50 0.75
0.36 0.36 0.36 0.35
0.37 0.38 0.37 0.36
0.86 0.86 0.85 0.82
0,024 0.024 0,024 0,024
0.020 0,020 0.020 0.020
-
0.36 pct C-0.3 pct Si-0.8 pct Mn-l
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