Abstract
The effects of boron, titanium, and nitrogen contents on the hardenability of boron-bearing steels have been studied. The boron hardenability factor was found to be a rapidly decreasing function of (total N – N as TiN). Thus, it was confirmed that titanium plays a very important role in retaining the excellent hardenability through its scavenging effect for dissolved nitrogen. From the results of this work, a useful guide concerning the limitation of total nitrogen content was derived for the development of titanium-free boron steels characterized by a good combination of hardenability, machinability, and toughness, especially for heat-treated parts made for heavy equipment.
Get full access to this article
View all access options for this article.
References
1.
It
A
. GRANGE and T. M. GARVEY : Trans. ASM , 1946 , 37 , 136 .
2.
GRANGE
R. A.
and,.
MITCHELL
R.
ibid ., 1961 , 53 , 157 .
3.
TADA
S.
,
AIDA
A.
,
FUJITA
M.
, and
OHNO
T.
Sumitomo Met ., 1970 , 22 , (3 ), 301 .
4.
KAKIMI
N.
,
TAMURA
E.
,
OHIRA
N.
, and
TAKEDA
M.
ibid. , 334 .
5.
KAJIYAMA
K.
,
TADA
S.
,
AIDA
A.
,
FUJITA
M.
, and
UNO
T.
Sumitomo Search , 1971 ,(5), 102.
6.
OHMORI
Y.
: Trans. Iron Steel Inst. Jpn , 1971 , 11 , 339 .
7.
UNO
K.
,
MIZOGUCH1
T.
,
OHNO
T.
, and
NAKASATO
F.
Sumitomo Met. , 1972 , 24 , (4) , 107 .
8.
OHNO
T.
,
UNO
K.
,
MIZOGUCHI
T.
, and
NAKASATO
F.
Sumitomo Search , 1973 , (10), 87.
9.
UENO
M.
and
INOUE
T.
Trans. Iron Steel Inst. Jpn , 1973 , 13 ,210 .
10.
MELLOY
G. F.
,
SUMMON
P. R.
, and
PODGURSKI
P. P.
Mew/I. Trans ., 1973 ,4 , 2279 .
11.
HABU
R.
,
MIYATA
M.
,
SEKINO
S.
, and
GODA
S.
Tet514 to-Hagané (J. Iron Steel Inst.’ pn) , 1974 , 60 , 1470 .
12.
LLEWELLYN
D. T.
and
cooa
W. T.
Met. Technol ., 1974 , 1 , (12 ), 517 .
13.
WATANABE
S.
,
OHTANI
H.
, and
KUNITAKE
T.
Tet.su-to-Hagatn, (J. Iron Steel hut. Jan) , 1976 ,62 , 1842 .
14.
WATANABE
S.
and
OHTANI
H.
ibid ., 1851 .
15.
KEOWN
S. R.
and
PICKERING
F. B.
Met. Sei ., 1977 ,11 ,225 .
16.
YAMANAKA
K.
and
OHMOR1
Y.
Trans. Iron Steel Inst. Jpn ., 1977 , 17 ,92 .
17.
WATANABE
S.
,
OHTANI
H.
, and
KUNITAKE
T.
Tetstt-to-Hagani (J. Iron Steel Inst. Jan) , 1978 , 64 , 113 .
18.
YAMANAKA
K.
and
OHMORI
Y.
ibid ., 1153 .
19.
GRANGE
R. A.
: `13, Ca, Cb and Zr in iron and steel’ , 3 –57 ; 1957 , New York , Wiley Inc .
20.
MELLOY
G. F.
and
RUSS
J. C.
Met. Progr ., 1966 ,90 , (5 ), 82 .
21.
SAKAI
T.
,
NAKASATO
F.
, and
TAKAHASHI
M.
Sumitomo Metal Industries, Ltd, Central Research Laboratories , unpublished work , 1978 .
22.
GROSSMAN
MA.
Trans. AIME , 1942 , 150 , 242 .
23.
ERASMUS
L. A.
: J. Iron Steel Inst ., 1964 , 202 , 33 .
24.
FOUNTAIN
R. W.
and
CHIPMAN
j.
Trans. A/ ME , 1962 , 224 , 559 .
25.
SAWAMURA
H.
and
MORI
T.
Tetsit-to-Hagani (J. Iron Steel Inst. Jpn) , 1957 , 43 ,31 .
26.
KUNITAKE
T.
,
WATANABE
S.
, and
SUGISAWA
S.
ibid. , 1973 , 59 , (11 ), 565 .
27.
IZEKI
Y.
,
SAIKI
K.
,
SAKAI
K.
,
NAKAMURA
M.
,
OHTANI
H.
, and
WATANABE
S.
Sumitomo Met ., 1975 , 27 , (4 ), 399 .