Effect Of Steel Composition Research Articles

Diffusion Chromising of Steel by CVD Using Chloride Compounds: I Coating Process

A new coating method has been developed, by which a chromium coating 10-40 μm in thickness can be obtained on a steel sheet. The technique used is CVD with metallic chromium and iron (III) chloride reagents. Coating time is 1-4h at temperatures of 840- 980°C. The diffusion coating obtained by this method is uniform and ductile, and has a good adherence to the base metal. The effect of steel composition on chromium diffusion is discussed.

The effect of thermomechanical history upon the microstructure and magnetic properties of nonoriented silicon steels

A study has been conducted to evaluate the effect of hot rolling conditions on precipitation behavior of MnS and AIN, microstructure, texture, and subsequent magnetic properties of nonoriented silicon steels. TEM work showed that MnS particles act as nucleating sites for dissolved A1N by providing an interface on which to precipitate. It was established that for the steels studied, a decrease in reheat temperature and a corresponding increase in coiling temperature resulted in an improved texture and, subsequently, better final magnetic properties. These results were explained based upon the effect of steel composition and hot rolling history on recrystallization behavior in the hot band and continuously annealed strip.

溶融アルミめつき鋼板の耐熱性および高温強度におよぼす鋼成分の影響

溶融アルミめつき鋼板の耐熱性および高温強度におよぼす鋼成分の影響

Internal oxidation during carburizing and heat treating

The internal oxidation of the surface layers of ferrous engineering components during carburizing was known for many years, but post heat treating machining and grinding operations have ensured that this oxidation phenomenon has had no deleterious effects on their properties. Recently, however, economical considerations have demanded that where possible such finishing operations should be eliminated and hence there is now considerable interest in avoiding internal oxidation during carburizing—or heat treating steel in general. It is the purpose of the present paper to discuss the factors which in-fluence the depth and configuration of internal oxidation, in particular the effects of steel composition and the thermochemical processing conditions. Internal oxidation and the associated metallurgical difficulties cannot be sufficiently avoided during industrial car-burizing, and hence the factors necessary to minimize internal oxidation are discussed, including the use of oxygen free carburizing media and silicon reduced steels.

Effects of Steel Composition on the Surface Reactivities of Steel Sheets

Effects of Steel Composition on the Surface Reactivities of Steel Sheets

Principles of Stress Corrosion Cracking As Related to Steels

Abstract This article is a general educational treatment of stress-corrosion cracking phenomena occasionally confronting design, operations, maintenance and research engineers. It reviews: Possible mechanisms: electrochemical dissolution, alloying, and hydrogen embrittlement of steels in solutions and liquid metals. Aspects of the electrochemical mechanism and the alternate mechanical-electrochemical mechanism. Stress corrosion cracking in ferrous alloys and proposed stress corrosion mechanism as they relate to these alloys. Effects of steel composition, mechanical properties, heat treatment, stress level, cold work, welding and corrosive environment on the susceptibility to stress corrosion cracking. Preventive measures: stress relieving, cathodic protection, alloy selection and modification of environment.

高張力鋼の再現熱影響部の切欠靭性

Following 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.