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Volume 33, Issue 9
Displaying 1-7 of 7 articles from this issue
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Toshio Ohwa1964 Volume 33 Issue 9 Pages 691-702
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
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Tsuneo Kurokawa1964 Volume 33 Issue 9 Pages 703-709
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
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Heat-Affected Zone Cracking in Welded High Tensile Steels due to Stress Relief Heat TreatmentTorazoo Naiki, Yasuhisa Yamazaki, Yukio Manago, Hisaki Okabayasi1964 Volume 33 Issue 9 Pages 710-717
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSHeat-affected zone cracking due to stress relief heat treatment has been investigated on a wide variety of ferritic steels by simple welding tests and a bend restraint SR cracking test.
The results indicate that intercrystalline cracking may occur during the heat treatment ; local stress raisers are necessary to initiate this cracking ; this cracking may not occur in deposited metal and parent metal inaffected ; and susceptibility to cracking depends markedly on chemical composition.
Suggested remedies for the cracking problems are : the use of (1) buttering technique prior to welding, (2) grinding off the excess weld metal to remove the notch of the weldment before stress relieving, and/or (3) preventive bead technique before stress relieving.View full abstractDownload PDF (5651K) -
Observation of Initiation and Development of CrackingTorazoo Naiki, Hisaki Okabayasi, Ryoichi Kume1964 Volume 33 Issue 9 Pages 718-725
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThe inition and development of the heat-affected zone cracking in a T-1 type steel during stress relief heat treatment were obsrved under the high-temperature microscope, and furthermore studied by means of electric resistivity method.
The results indicate that sliding at a grain boundary occurs prior to cracking during the stress relief heat treatment and that the crcak originates at a three grain junction and propagates from the junction along one of the grain boundaries at the triple point developing into an extensive in-terbrystalline cracking.View full abstractDownload PDF (7061K) -
Studies on electron-beam Welding (8)Tatsuya Hashimoto, Fukuhisa Matsuda1964 Volume 33 Issue 9 Pages 726-734
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSWith utilization of penetration mechanism in electron-beam welding, an equaption which estimates the penetration depth in bead by calculation is induced from thermal conduction theory in this report.
Moreover, to examine the valiuity of the equation, each penetration depth which is estimated by the equation is compared and discussed with the actual depth in numerous beads under the same welding conditions.
As a result of this discussion, it becomes apparent that the induced equation for calculation of the penetration depth gives successfully the penetration depth in actual bead.
Therefore, if the welding condition and physical constants for the used material are known, the penetration depth in actual bead can be easily estimated by simple calculation using the above equation.View full abstractDownload PDF (520K) -
Nobuo Fukutome1964 Volume 33 Issue 9 Pages 735-742
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSWeld heat-affected zone of austenitic stainless steel is susceptible to intergranular corrosion for the grain-boundary carbides precipitated by the thermal cycles during welding. In the previous paper the influence of the peak temperatures of thermal cycles on the susceptibility to corrosion
and the precipitation of carbide particles was investigated. In this paper the relationship between the corrosion resistance and the behaviour of carbide particles was investigated on all of the specimens given thermal cycles between the room temperature and the temperature of 650°or 800°C after solution treatment at 1050°C for various holding times up to 2 hr. The results obtained were as follows :
(1) It was recognized that the amount of carbide particles precipitated during thermal cycles decreased with increasing holding time of solution treatment. The remarkable precipitation of carbide particles was observed in the specimens given twenty cycles at the peak temperature of 800°C after solution treatment for the shortest holding time and the precipitates were continuously formed along grain boundaries.
(2) Boiled 65% nitric acid tests on the specimens given thermal cycles showed that in the same peak temperature and number of thermal cycle, the susceptibility to corrosion decreased with longer holding time of solution treatment.
(3) Intergranular corrosion tests by Strauss solution showed that etching occurred on all of boundaries precipitating carbide particles. There was a direct correspondence between the degree of etching and the amount of precipitates. The etching increased with increasing amount of precipitates and was very severe for the specimen given twenty cycles at the peak temperature of 800°C after solution treatment for the shortest holding time.
(4) In the electron microscopic observation of the carbide particles extracted from the specimens given thermal cycles after solution treatment, a numerous of fine carbide particles and a few dendritic carbide particles were observed around grain boundaries.View full abstractDownload PDF (11826K) -
1964 Volume 33 Issue 9 Pages 746-870
Published: September 25, 1964
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (39289K)
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