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Volume 30, Issue 11
Displaying 1-6 of 6 articles from this issue
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Yutaka Kasamatsu1961 Volume 30 Issue 11 Pages 795-806
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (705K) -
1961 Volume 30 Issue 11 Pages 807-819
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (445K) -
Haruyoshi Suzuki, Hiroshi Tamura1961 Volume 30 Issue 11 Pages 820-830
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSFollowing the previous paper, the notch toughness of the weld HAZ microstructures of high strength steels was evaluated by means of the synthetic apparatus. Summalizing the whole results, including previous tests, the effects of steel composition, microstructure and other factors on the notch toughness of weld HAZ specimens have been clarified. From these discussions, the following conclusions were summalized ;
(1) The notch toughness of coarsened HAZ microstructures in high strength steels was generally decreased compared that of their unaffected base metals, especially in quenched and tempered steels.
(2) The toughness of HAZ microstructures was decreased in accordance with the order of decreasing hardness, namely, martensite, mixed structure (martensite and bainite), coarse bainite and pearlite or ferrite.
(3) The critical carbon content at which the martensite toughness in weld HAZ was markedly declined, may be about 0.18%.
(4) The superiority of the test steels, when compared to the toughness of reproduced HAZ microstructures, was convinced by the test to agree with that of the tensile ductility which obtained by synthetic HAZ ductility tests in previous studies.View full abstractDownload PDF (2982K) -
Physico-Chemical Study on the Chemical Reaction between Slag and Metal in Welding Process (Report 2)By Arc Welding Electrode Containing Fe-Si, or Fe-Mn and Fe-Si in its Coating as DeoxidizerYutaka Kasamatsu1961 Volume 30 Issue 11 Pages 831-837
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSA physico-chemical study has been made on the chemical reactions between molten slags and metals in welding processes by arc welding electrodes containing Fe-Si or both Fe-Si and Fe-Mn in its coatings as deoxidizers, and the following results were obtained.
(1) K'Mn is decreased with increasing Fe-Si contents in the coatings, but independent of the slag-basicities in the same deoxidation condition.
(2) It seems that K'O is independent of the slag-basicities, the compositions of metals and the deoxidation conditions.
(3) K'Si is decreased with increasing the slag-basicities and Fe-Si contents in the coatings.
(4) Activity coefficient of SiO2 is increased with decreasing the slag-basicities, but independent of the deoxidation conditions.
(5) These results suggest that the chemical reactions in welding processes are not liable to be reached exactly the equilibrium state.View full abstractDownload PDF (469K) -
On the β→α Transformation Process in α+β Titanium AlloysMinoru Okada, Shigeo Shin1961 Volume 30 Issue 11 Pages 838-850
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSAs for the β→α transformation process in α+β titanium alloy there are little theories.
In this investigation, were studied on the process and the mechanism of the β→α transformation were made clear.
The β→α transformation in α+β titanium alloy progresses as following.
β0→ω+βγ→ω+α+βγ→α+βγ (βγ→α+βu)
where, β0, βγ, and βu, mean the change of density (composition) of alloying element in β according to the transformation process.
This ω is a methodical crystal structure (the structure is b.c.c. and has about three times as large lattice constant as that of original β) which is formed with travelling of the solute atoms so as to form the unit cell which is necessary to the β→α transformation. But this w was seen only in the earlier period of the bigining of a precipitates from β in the β→α transformation, and when a little of the transformation progressed on (or in α+β titanium alloys containing a small amount of β-stabilizer), something as ω could not be seen.View full abstractDownload PDF (14198K) -
Cutting Ability of Twin and Flat Nozzle TipsKan-ichi Suizu, Takeo Yasuda1961 Volume 30 Issue 11 Pages 851-855
Published: November 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSCutting ability of twin divergent nozzle tips and flat nozzle tips specially made for the experimental use, was investigated.
The results may be summarized as follow:
(1) Cutting efficiency of the twin nozzle tips is not higher than that of standard single nozzle tips, and decreases with increasing space between both nozzles.
(2) Cutting efficiency of the flat nozzle tips is conspicuously below that of standard nozzle tips.
(3) Variation of the nozzle position to the cutting direction, that is tandem or transverse, has no significant effect on the cutting efficiency at usually encountered cutting speed.
(4) However, at slower cutting speed, the nozzle position has a great influence on the cutting ability. The critical speed, at slower than which the cutting ability decrease abruptly in spite of the increase in oxygen quantity per unit length of cut, of the tandem twin nozzle tips is higher than that of the standard single nozzle tips. On the contrary, when transverse flat nozzle tips are used, the critical cutting speed is greatly lowered.View full abstractDownload PDF (328K)
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