Abstract
The heat-treatment and properties of some ferrous sintered alloys are investigated. The approach has been to introduce nitrogen to enhance the heat-treatment response during the heat-treatment cycle. The process is known as γ-nitriding to distinguish it from the ferritic nitriding process which is a surface-hardening treatment. Addition of H2S to the γ-nitriding atmosphere may be used to improve machinability. It is suggested that the economics of the process may be favourable enough for the process to be commercially viable.
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References
1.
Lehrer
E.
: Z. Electrochem ., 1930 , 36 , 383 .
2.
Paranjpe
V. G.
,
COHEN
M.
,
BEVER
M. B.
, and
FLOE
C. F.
Trans. AIME , 1950 , 188 , 261 .
3.
Bose
B. N.
and
HAWKES
M. F.
ibid ., 1950 , 188 , 307 .
4.
Jack
K. H.
: Proc. R. Soc ., 1951 , 208A , 200 .
5.
Jack
K. H.
: ibid ., 1951 , 208A , 216 .
6.
Bell
T.
and
FARNELL
B. C.
‘Chemical metallurgy of iron and steel’ , 275 –277 . 1973 : London (Iron Steel Inst .).
7.
Bell
T.
and
OWEN
W. S.
J. Iron Steel Inst ., 1967 , 205 , 1017 .
8.
Brough
D.
: PhD thesis , Liverpool University , 1967 .
9.
Bell
T.
and
BROUGH
D.
Met. Sci. J ., 1970 , 4 , 171 .
10.
Bell
T.
and
FARNELL
B. C.
Inst . Met. Monograph No . 33 , 1960 , p. 282 .
11.
Atkinson
D.
,
BELL
T.
, and
BROUGH
D.
J. Iron Steel Inst ., 1965 , 203 , 836 .
12.
Fast
J. D.
: ‘Interaction of gases and metals’, Vol. I, 148-174. London (Macmillan).
13.BS . 2590, Part 1, 1969; BS. 18, Part 2, 1971.
14.
Brough
D.
and
SCHOFIELD
J.
1st Joint Polytechnic Symp. on ‘Manufacturing engineering’, Leicester Polytechnic, 14-15 June 1977.