Download or read book Structure and Mechanical Properties of Fe Cr Mo C Alloys with and Without Boron written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonconventional heat treatments were designed to improve the mechanical properties of these martensitic steels. Results show that the as-quenched structures of both steels consist mainly of dislocated martensite. In the boron-free steel, there are more lath boundary retained austenite films. The boron-treated steel shows higher strengths at all tempering temperatures but with lower Charpy V-notch impact energies. Both steels show tempered martensite embrittlement when tempered at 350°C for 1 hour. The properties above 500°C tempering are significantly different in the two steels. While the boron-free steel shows a continuous increase in toughness when tempered above 500°C, the boron-treated steel suffers a second drop in toughness at 600°C tempering. Transmission electron microscopy studies show that in the 600°C tempered boron-treated steel large, more or less continuous cementite films precipitate at the lath boundaries, which are probably responsible for the embrittlement. The differences in mechanical properties at tempering temperatures above 500°C are rationalized in terms of the effect of boron-vacancy interactions on the recovery and recrystallization behavior of these steels. Boron seems to impair room temperature impact toughness at low strength levels but not at high strength levels. By simple nonconventional heat treatments of the present alloys, martensitic steels may be produced with quite good strength-toughness properties which are much superior to those of existing commercial ultra-high strength steels. It has also been shown that the as-quenched martensitic steels need not be brittle and in fact very good combinations of strength and toughness can be obtained with as-quenched martensitic steels. 56 fig., 5 tables, 75 references. (DLC).

Download or read book Structure and Mechanical Properties of Fe Cr Mo C Alloys with and Without Boron written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonconventional heat treatments were designed to improve the mechanical properties of these martensitic steels. Results show that the as-quenched structures of both steels consist mainly of dislocated martensite. In the boron-free steel, there are more lath boundary retained austenite films. The boron-treated steel shows higher strengths at all tempering temperatures but with lower Charpy V-notch impact energies. Both steels show tempered martensite embrittlement when tempered at 350°C for 1 hour. The properties above 500°C tempering are significantly different in the two steels. While the boron-free steel shows a continuous increase in toughness when tempered above 500°C, the boron-treated steel suffers a second drop in toughness at 600°C tempering. Transmission electron microscopy studies show that in the 600°C tempered boron-treated steel large, more or less continuous cementite films precipitate at the lath boundaries, which are probably responsible for the embrittlement. The differences in mechanical properties at tempering temperatures above 500°C are rationalized in terms of the effect of boron-vacancy interactions on the recovery and recrystallization behavior of these steels. Boron seems to impair room temperature impact toughness at low strength levels but not at high strength levels. By simple nonconventional heat treatments of the present alloys, martensitic steels may be produced with quite good strength-toughness properties which are much superior to those of existing commercial ultra-high strength steels. It has also been shown that the as-quenched martensitic steels need not be brittle and in fact very good combinations of strength and toughness can be obtained with as-quenched martensitic steels. 56 fig., 5 tables, 75 references. (DLC).

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin written by Welding Research Council (U.S.) and published by . This book was released on 1995 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 1308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1964 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1990 with total page 1590 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Mechanical Properties of Fe Ni Co Alloys with and Without Carbon written by Mathur Ramachandran Veera Raghavan and published by . This book was released on 1972 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reactor Materials written by and published by . This book was released on 1970 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book 9th International Symposium on High Temperature Metallurgical Processing written by Jiann-Yang Hwang and published by Springer. This book was released on 2018-01-16 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, global metallurgical industries have experienced fast and prosperous growth. High-temperature metallurgical technology is the backbone to support the technical, environmental, and economical needs for the growth. This collection features contributions covering the advancements and developments of new high-temperature metallurgical technologies and their applications to the areas of processing of minerals; extraction of metals; preparation of metallic, refractory and ceramic materials; treatment and recycling of slag and wastes; and saving of energy and protection of environment.The volume will have a broad impact on the academics and professionals serving the metallurgical industries around the world.