TABLE OF CONTENTS FOR POWDER METALLOGRAPHY

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600340023-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 22, 2016
• Document Release Date: August 15, 2011
• Sequence Number: 23
• Publication Date: August 25, 1950
• Content Type: REPORT

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1
CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR
SUBJECT Scientific - Metals
HOW
WHERE
DATE
PUBLISHED 1948
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DATE DIST./6 Aug 1950
NO. OF PAGES 6
SUPPLEMENT TO -
REPORT NO. -
THIS IS UNEVALUATED INFORMATION
SOURCE Porosbkovoye metallovedeniye, Metallurgizdat,
M. Yu.'Bal'shin
Table of Contents
1. Powder Metallography, its place among other
branches of science, and its problems
II. Study of contact phenomena in application to
compact bodies
3.
It.
Surface state of compact metals
Study of a contact surface
5.
Interatomic forces. Surface forces of cohesion.
Equilibrium between externa]yand intermolecular
forces
6.
Deformation of the contact surface. Relation
between the contact area and pressure
23
io of forming 2ontact surface
29
8.
Work. of forming a contact surface
32
SYATE
ARMY
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9. Changes in the area of a contact surface?at
unloading. Elastic after effect 33
10. Contact strength 38
11. Shifting of the contact surface during sliding 43
III. Metal powders
12. Fundamental information on structural elements 46
of metal powders
13. Condition of the loose material under action
of its own weight 55
14.- Various methods for expressing the volume
characteristic of porous bodies 62
IV. Cold deformation of metal powders
15. General information 65
16. Maximum stresses and minimum sections in
powder bodies. Relation between the contact
surface and pressure
17 Changes in the structure and state-of
powders caused by pressing 70
18. Pressure of pressing 77
19. Relation between "net" pressure and
deformation during pressing of the powders 78
20. Real diagrams of pressing: relative volume --
the logarithm of specific pressure 83
21. Further study of semilogarithmic diagrams
of pressing
D ndence of the pressing diagram on the
22
. ep:
kind of metal and pressing temperature 94
23. Dependence of semilogarithmic pressing dia-
grams on the volume characteristic and struc-
tural factors 99
24. Pressing the mixtures
25. Influence of oxides
26. Effect of treatment on the pressability
of powders
27 Other expressions for relation between
pressure and the compression degree 105
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29.
Deviation of logarithmic diagrams from the
rectilinear
30.
Effect of lubricators on pressing diagrams
113
V. Distribution of pressure and density in powder
materials
31. Lateral pressure
32. Pressure loss on friction against walls of a
die and ejecting pressure
33. Nonuniform density along the heir it and cross
section of compressed parts
34. Effect of dimensions of a compressed part on
pressing diagrams
35. Relation between the lateral pressu a and angle
of rest in noncompressed powders
VI. Phenomena taking place after releasing pressure -
Elastic aftereffect
36. Elastic aftereffect
37. Changes in the electric conductivity of
compressed parts as a result of the elastic
aftereffect
38. Effect of air
VII. Properties of compressed parts
131
137
141
39. Electric conductivity of compressed parts 141
40. Porosity of compressed parts 144
41. Initial information on mechanical proper-
ties 147
of compressed products
42. Modulus of elasticity of compressed products 149
43. Some results of the proportionality between 153
the modulus of elasticity and pressure
44. Dependence of the strength of compressed pro-
ducts 154
on pressur_ and porosity
45. Dep&ndence of the strength on properties and
condition of metal in a powder
46. Effect of impurities and admixtures on the
strength of compressed products
47. Effect of the volume characteristic and
structure of particles on the strength of
compressed products
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199
208
c
an
vergence and e'.i. .nce of particles 209
Deformation in heating under action of external
forces
60. Definition of the term sintering
61. Processes occurring in sintering. Increase
' surface. Con-
rease of t- contact
d d
-62. Increase of a contract surface ,and .^,ontractinn
as results of the atom mobility
63. Amortization of residual stresses
64. Unregulated localization of contraction
65. Individual modifications of particles
66. Thermal expansion and contraction
67. Effect of impurities
68. Recrystallization
X. Effect of sintering conditions
69. Evaluation of the sintering process
70. Influence of the sintering temperature on
contact, contraction, and properties
212
216
218
223
224
225
230
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Page
48.
Effect of the pressing rate
167
49.
Causes of rejection
170
50.
Eardness of compressed products
171
51.
Is there a quality difference between com-
pressed and uncompressed powders
52.
The cold pressing process from the power
viewpoint
VIII. Introduction to the sintering theory
s and its changes on
m
a
t
o
f
Mobility o
53
55? Deformation of compact metals conditioned
. 178
heating
184
54. Further information on the atom mobility
by atom mobility 190
56. Recovery and recrystallization in compact
metals
58. Volume changes during annealing of compact
metals
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Influence of the temperature on structural
modifications. Relation between structural
modifications and contraction
72. Influence of the sintering time period 254
73. Influence of the size, shape, and structure 259
of particles
74. Influence of the.size and shape of particles
on the str:.:ture of sintered products 263
75. Influence of the pressing density 265
76. Influence of preliminary treatment of powders 2'(2
Influence of metal type and of phase trans-
formations 274
formations
y 284
ponents Preliminary comments
83. Systems with mutual solubility of components 286
84. Sintering of multicomponent systems with
formation of the liquid phase 291
85. Activated sintering without formation of 298
the liquid phase
78. Investigation of individual modifications of
particles in sintering
79. Effect of the sintering atmosphere
XI. Sintering of mu]ticomponent systems
80. General comments
81. The case of mutual insolubility of com-
ponents
82 S stems with mutual solubility of com-
87. Properties of porous metals 305
XII. riot pressin
86. Basic information
XIII. Properties of sintered powder metals
88. Properties of compact sintered metals
and alloys
uvr Si fIc nce of powder metallograph-v
89. General comments
Powder metallography and the study of
deformation and strength 316
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91.
92..
Changes in intergranular contact of
compact metals
Admixtures in cast metals
powder metallography and problems of
crystallization of molten metals 324
50X1-HUM
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