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Strength-Toughness Relations for Precipitation-Strengthened Low-Alloy Steels Containing Columbium, by J. M. G r a y , pp. 1495-1500. Page 1500 Addendum The following three tables should be included in this paper.
Table I. Chemical Composition of Steels Investigeted--Wt Pct Total AI
Designation
C
Mn
P
S
Si
Base Steel Cb-N Steel Cb-C Steel
0.004 0.005
1.24 1.15 0.52
0.023 0.022
0.021 0.021 0.020
0.32 0.26
0.022
0.020
N
0.001 0.001 0.008
0.12
Cb
0.006 0.001 0.006 0.036 0.001 0.10
Table II. Mechanical Properties of Steels Investigated Charpy V-Notch Transition
Tensile Properties*
Steel
Base
Cb-N
Cb-C
Isothermal Transformation Temperature,~176
Yield Strength, ksi
Tensile Strength, ksi
Elongation in 1 in., Pct
Reduction of Area, Pct
"Normalizing" Parameters for Base Steelt
Temperature, oF V~s
Vso
Yield Strength, ksi
600(1112) 635(1175) 675(1247) 710(1310) 750(1382) 810(1490)
~ 28.3 27.5 27.2 25.8 24.2 26.1
50.3 50.3 49.8 49.3 48.8 52.4
40.0 41.0 41.0 39.0 41.7 41.0
79.5 83,1 82.0 78.4 82.0 82.3
0 10 -15 -10 10 25
15 0 0 10 40 65
-3.3 -2.5 -2.2 -0.8 0.8 -1.1
0 10 15 10 -10 -25
600(1112) 635(1175) 675(1247) 710(1310) 750(1382) 810(1490)
45.2 44.5 41.5 37.7 28.9 23.6
62.8 62.0 59.7 55.7 51.2 49.1
30.7 31.7 31.5 35.0 38.0 40.0
81.6 81.3 82.1 82.7 84.1 84.4
70 55 35 0 -30 -30
85 90 80 25 5 -10
-
-
600(1112) 635(1175) 675(1247) 710(1310) 750(1382) 810(1490)
63.1 54.6 47.5 43.9 33.2 23.6
79.7 72.0 64.9 62.0 52.8 47.1
27.0 27.5 29.0 30.0 37.0 40.0
76.9 78.9 81.4 81.7 84.4 85.2
215 200 155 110 60 20
240 220 185 155 90 80
-
*Average of duplicate 0.252 in. diam tension specimens. tYield strength normalized to 25.0 ksi, and V~s and Vso transition temperatures normalized to 0 ~ and +40~
Vso, F
Yield Strength, ksi
25 40 40 30 0 -25
25.0 25.0 25.0 25.0 25.0 25.0
0 0 0 0 0 0
40 40 40 40 40 40
-
41.9
-
4 2 . 0
-
39.3 36.9 29.7
70 65 50 10 -40
110 130 120 55 5
-
22.5
-55
-35
-
59.8 52.1 45.3 43.1 34.0 22.5
215 210 170 120 50 -5
265 260 225 185 90 55
o
V~s, ~
-
-
Mechanical Properties After "Normalizing"
-
-
V~s,~
Vso,~
respectively.
Table III. Literature Values for the Ratio of the Change in Transition Temperature to the Change in Yield Strength (A TT/A YSJ
zx~ / zx Ys, Comment CbC precipitation. Steel WQ* and aged at 1 IO0~ CbC precipitation. Steel WQ and aged at 1150~ CbC precipitation. Hot-rolled steel. Precipitation hardening. Hot.rolled steel. CbC precipitation. Hot-rolled steel (0.63 Mn). CbC precipitation. Hot-rol/ed steel (1.2 Mn). Average Calculated from theory.
o F/ksi
Reference
4.5 1.3 5.0 3.2 8.7 4.8
Bucher ~4 Bucher 14 Repas ~s Gladmans Morrison 16 Morrison 16
4.6 5.9
Heslop and Petch 2
*WQ = Water-quenched.
2 3 0 8 - V O L U M E 3, A U G U S T 1972
METALLURGICAL TRANSACTIONS
