Resistance of cast steel to brittle fracture

1974 ◽  
Vol 6 (11) ◽  
pp. 1308-1310 ◽  
Author(s):  
V. V. Panasyuk ◽  
Yu. A. Shul'te ◽  
S. E. Kovchik ◽  
I. P. Volchok ◽  
N. S. Kogut ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Cast Steel

Notch Effects on Impact and Bending Characteristics of Spheroidal Graphite and Compacted Vermicular Graphite Cast Irons with Various Matrices

2010 ◽  
Vol 457 ◽  
pp. 392-397 ◽  
Author(s):  
Tohru Nobuki ◽  
Minoru Hatate ◽  
Toshio Shiota
Keyword(s):  
Cast Iron ◽  
Transition Temperature ◽  
Brittle Fracture ◽  
Cast Steel ◽  
Charpy Impact ◽  
Spheroidal Graphite ◽  
Buffer Effect ◽  
Cast Irons ◽  
Type Specimens ◽  
The Impact

The object of this study is to find out and evaluate systematically how the basic factors such as graphite-shape, external notch and matrix-characteristic affect the impact and bending characteristics of cast irons. The Spheroidal Graphite (SG) and Compacted Vermicular graphite (CV) cast iron samples were prepared, and their matrixes were modified into ferritic, pearlitic and bainitic in order to make the various kinds of samples whose graphite-shape and matrix vary widely. From each sample we produced five kinds of Charpy-type specimens by adding five kinds of notches whose stress concentration factor (α) varied from 1.0 (un-notched) to 4.8. The Charpy impact value decreases greatly in the range of α from 1 to 2.3 but decreases slightly in the range of α larger than 2.3. No influence to the fracture energy in the range of α larger than 2.3. Increasing of α results in moderate elevation of transition temperature of Charpy impact value and the transition temperature of CV cast ion is lower than that of SG one. The impact value in brittle fracture region of the cast iron samples were recognized to be a little bit larger than that of cast steel sample, and it was considered to be caused by graphite which act as a kind of buffer effect against crack growth in brittle fracture.

scholarly journals Investigation on brittle fracture mechanism of a grade E cast steel knuckle

2014 ◽  
Vol 2 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Jin Huang ◽  
Lu Xia ◽  
Youshou Zhang ◽  
Sinian Li
Keyword(s):  
Brittle Fracture ◽  
Fracture Mechanism ◽  
Cast Steel

Determination of tendency of cast steel toward brittle fracture

1978 ◽  
Vol 14 (1) ◽  
pp. 35-39
Author(s):  
I. P. Volchok ◽  
S. E. Kovchik ◽  
M. N. Zima
Keyword(s):  
Brittle Fracture ◽  
Cast Steel

611 Low Temperature Brittle Fracture of Duplex Stainless Cast Steel

2011 ◽  
Vol 2011.19 (0) ◽  
pp. 171-172
Author(s):  
Katsuya SHINBA ◽  
Osamu TAKAHASHI ◽  
Morio YABE ◽  
Yo TOMOTA
Keyword(s):  
Low Temperature ◽  
Brittle Fracture ◽  
Cast Steel

Nitriding of a Nb-Microalloyed Thin Strip Cast Steel at 525°C

2010 ◽  
Vol 654-656 ◽  
pp. 106-109 ◽  
Author(s):  
Kelvin Y. Xie ◽  
Chen Zhu ◽  
Julie M. Cairney ◽  
Simon P. Ringer ◽  
Chris R. Killmore ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Mechanical Performance ◽  
Cast Steel ◽  
Salt Bath ◽  
Thin Strip ◽  
Dispersion Strengthening ◽  
Solid Solution Strengthening ◽  
Roll Casting ◽  
Strip Cast ◽  
Nb Microalloyed Steel

This study investigates the effect of N diffusion on a Nb-microalloyed steel made by twin roll casting at 525o C in a KNO3 salt bath. Nitriding up to 4 h increases the yield strength of the steel by ~50% with only a small drop in ductility, while 6 hours of nitriding causes brittle fracture. The improved mechanical performance after 4 hours of nitriding is thought to be a combined effect of solid solution strengthening of N diffusion and dispersion strengthening from extremely fine Nb-rich precipitates. Coarse features along grain boundaries consistently observed in steel nitrided for 6 hours are considered to be responsible for brittle fracture in samples nitrided for longer.

The crystallography characteristic of (Mn,Fe)S single crystal

1990 ◽  
Vol 48 (4) ◽  
pp. 898-899
Author(s):  
Jiang Xishan
Keyword(s):  
Single Crystal ◽  
Cast Steel ◽  
Point Group ◽  
Central Area ◽  
Hexagonal Crystal ◽  
Growth Step ◽  
Left And Right ◽  
Relationship Of ◽  
Fcc Structure ◽  
New Discovery

This paper reports the growth step pattern and morphology at equilibrium and growth states of (Mn,Fe)S single crystal on the wall of micro-voids in ZG25 cast steel by using scanning electron microscope. Seldom report was presented on the growth morphology and steppattern of (Mn,Fe)S single crystal.Fig.1 shows the front half of the polyhedron of(Mn,Fe)S single crystal,its central area being the square crystal plane,the two pairs of hexagons symmetrically located in the high and low, the left and right with a certain, angle to the square crystal plane.According to the symmetrical relationship of crystal, it was defined that the (Mn,Fe)S single crystal at equilibrium state is tetrakaidecahedron consisted of eight hexagonal crystal planes and six square crystal planes. The macroscopic symmetry elements of the tetrakaidecahedron correpond to Oh—n3m symmetry class of fcc structure,in which the hexagonal crystal planes are the { 111 } crystal planes group,square crystal plaits are the { 100 } crystal planes group. This new discovery of the (Mn,Fe)S single crystal provides a typical example of the point group of Oh—n3m.

Mcc Corrosion Tests at Reference Testing Conditions for A27 Cast steel in Hanford Ground Water

1986 ◽  
Vol 84 ◽  
Author(s):  
M.D. Merz ◽  
F. Gerber ◽  
R. Wang
Keyword(s):  
Pacific Northwest ◽  
Pressure Vessel ◽  
Static Pressure ◽  
Cast Steel ◽  
Statistical Treatment ◽  
Testing Conditions ◽  
Corrosion Tests ◽  
Corrosion Rates ◽  
High Level Nuclear Waste ◽  
High Level

AbstractThe Materials Characterization Center (MCC) at Pacific Northwest Lab- oratory is performing three kinds of corrosion tests for the Basalt Waste Isolation Project (BWIP) to establish the interlaboratory reproducibility and uncertainty of corrosion rates of container materials for high-level nuclear waste. The three types of corrosion tests were selected to address two distinct conditions that are expected in a repository constructed in basalt. An air/steam test is designed to address corrosion during the operational period and static pressure vessel and flowby tests are designed to address corrosion under conditions that bound the condi ring the post-closure period of the repository.The results of tests at reference testing conditions, which were defined to facilitate interlaboratory comparison of data, are presented. Data are reported for the BWIP/MCC-105.5 Air/Steam Test, BWIP/MCC-105.1 Static Pressure Vessel, and BWIP/MC-105.4 Flowby Test. In those cases where data are available from a second laboratory, a statistical analysis of interlaboratory results is reported and expected confidence intervals for mean corrosion rates are given. Other statistical treatment of data include analyses of the effects of vessel-to-vessel variations, test capsule variations for the flowby test, and oven-to-oven variations for air/steam tests.

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