Metallurgical Considerations Research Articles

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Closure to “Discussions of ‘Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service’” (1957, Trans. ASME, 79, pp. 1391–1397)

Closure to “Discussions of ‘Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service’” (1957, Trans. ASME, 79, pp. 1391–1397)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Discussion: “Metallurgical Considerations of Main Steam Piping for High-Temperature, High-Pressure Service” (Blumberg, H. S., 1957, Trans. ASME, 79, pp. 1377–1391)

Exhaust Valve Life: Some Metallurgical and Mechanical Considerations

The factors controlling heat flow into and from the head of an exhaust valve are discussed for the purpose of indicating the means by which temperature, the overriding important factor in exhaust valve failure, can be reduced. This analysis suggests the lines along which the designer and the metallurgist must co-operate. The causes of exhaust valve failure are reviewed, and the conclusion is reached that the majority of these are the result of corrosion fatigue. Even for resistance to burning the two properties inherent in resistance to corrosion fatigue, namely resistance to corrosion and good hot strength, are essential. Laboratory tests for determining resistance to high temperature corrosion fatigue and hot hardness are described, and some results given for exhaust valve materials. Corrosion fatigue resistance is considered to be so significant a factor in exhaust valve failure that it is suggested that laboratory tests to determine this property should form the basis for the development of improved exhaust valve alloys.

鑄鐵の分析試料採取法に關する研究

In order to decide the most suitable method to take the samples of cast iron used for chemical analysis, we prepared six square bars which were cast in sand mould of various sizes (10×10×100-100×100×100mm).Each bars were cut from the center and twelve analytical samples taken from the outer and inner layers of them by drilling. Investigation was made on the influence of the particle size and of the rate of cooling on chemical composition of cast iron. We further made a metallurgical consideration from the relation between microscopic structure and mechanical properties. The results were:(1) The difference of chemical composition between the bars with the largest cross section and the bars with the smallest cross section is remakable. Namely, it is obvious that the chemical composition of cast iron is much effected in the structure of it. In other words, the rate of solidification as well as the rate of cooling after solidification play on important part in the change of structure.(2) Therefore, the white cast iron on which the change in the structure is very small indicates the standard value of chemical analysis.(3) In the gray cast iron, results of chemical analysis are much effected by the sampling method. However in any way, the coarse particles nearly indicate average value for chemical analysis, and the fine particles indicate marked defference.From the results of above experiments, it was found that the analytical results of each compositions of cast iron is much influenced by the particle sizes of shavings as well as the structure of specimens, and the coarser particle size than the particle size of 20 mesh indicates the standard values of chemical analysis. Further as a result of the comparative studies on the various methods of sampling of cast iron, it was confirmed that the most simple method of would be to analyse the coarse particles which were obtained by drilling with a 1-in. dia large-angle-edge (about 150°) drill at about 80r.p.m.

電子顕微鏡によるフェライト及びセメンタイトの研究

In this paper, the two kinds of precipitations in ferrite and cementite of iron or steel are described. These precipitations were observed by means of an electron microscope. (Reference Photo. 1 to Photo. 8).With these precipitations the following results were obtained by metallurgical considerations with respect to C, Si, Mn, P, S, N and O in iron or steel. (1) Ferrite contains many spherical precipitations, most of which are Fe3Si2 particles. (2) Fe3Si2 particles are about 550 Å in average. But this size grows in proportion as the Si content in iron or steel increases, and then they group with other kinds of particles. (3) Fe3Si2 particles are precipitated in a field of γ solid solution and their distribution is dense at the grain boundary but not in the interior of the crystal grains. (4) Cementite is a combination of Fe3C and Mn3C. (5) Spherical particles of MnSi are precipitated in a very small quantity from cementite. They are about 400 A on the average. (6) Growth of pearlite cementite is partially disturbed by the Fe3Si2 particles. (Reference Photo. 8). (7) As compared with ferrite of plain carbon steel, silico-ferrite contains much more Fe3Si2 particles.

Metallurgical Consideration on the Rejecting Percentage in the Cylinder Block Casting of Automobile Engine

Metallurgical Consideration on the Rejecting Percentage in the Cylinder Block Casting of Automobile Engine

Metallurgical Consideration on the Rejecting Percentage in the Cylinder Block Casting of Automobile Engine

Metallurgical Consideration on the Rejecting Percentage in the Cylinder Block Casting of Automobile Engine

Metallurgical and Fabrication Considerations in the Coal-Hydrogenation Demonstration-Plant Construction

Abstract Special equipment, special steels, and heavy wall thicknesses were required to handle hydrogen and abrasive pastes at the high pressures and temperatures of coal hydrogenation. Some metallurgical and fabrication problems pertaining to this specialized process are discussed herein.

Metallurgical Considerations of Gas Turbines

Abstract Comparatively little information is yet available concerning materials for application to the various types of gas turbines now in use, in the experimental stage, and projected. The author outlines the general requirements for such materials, placing special emphasis on those required for “hot” part application. The temperatures involved in gas-turbine practice have created conditions under which customary materials-testing procedure does not develop data on the characteristics which must be available. Testing methods and equipment to accomplish the desired results on high-temperature-resisting materials are discussed. The design and application of materials to specific hot parts of gas turbines are treated in some detail.

Precipitation-Hardened Alloys for Gas-Turbine Service—I: Metallurgical Considerations

Abstract This paper presents a detailed account of the metallurgical principles involved in the development of precipitation-hardened alloys for gas turbines, together with typical data on heat-resistant alloys “K42B,” “Discaloy,” “Refractaloy 26,” and “Refractaloy 70.” Selection of base alloy and hardening agent, choice of heat-treatment for optimum properties, and the use of short-time tensile and creep rupture tests in evaluating the effects of composition and heat-treatment variables are discussed in Part I. The creep rupture properties of K42B, Discaloy, Refractaloy 26, and Refractaloy 70 are given in Part II in the form of design curves for each alloy at one or more temperatures in the range 1200 to 1600 F. The factors governing choice of alloy for rotor and blading service are discussed together with some considerations on forging, machining, welding, and heat-treating these gas-turbine components.

The Correlation of the Metallurgical and Economic Considerations in the Selection of Automobile Engineering Materials

The Correlation of the Metallurgical and Economic Considerations in the Selection of Automobile Engineering Materials