Three different stages of heat removal when quenching in vaporizable liquids are film boiling or vapor blanket cooling, nucleate boiling and convective cooling (Fig. 1). In film boiling, surface ...temperatures are sufficiently high to produce a stable vapor film around the part. Cooling rates during film boiling are characteristically low due to the slow heat transfer through the vapor barrier. The transition temperature from vapor blanket cooling to nucleate boiling is the Leidenfrost temperature.
The success of the of induction hardening is closely related to using an optimal quench process, which depends on design considerations including quenchant cooling rate remediation mechanisms, ...material effects, and spray and immersion quench systems. nduction hardening is accomplished by the use of a suitable quenchant, which provides the required cooling rate to achieve the desired hardness. The selection of a specific quenchant depends on such factors as material, shape, crack-sensitivity and hardness pattern. The basic elements of the quench process were discussed in Part 1 of this article (see November 2005 IH). This article discusses the factors to be considered in designing a quench system.
Journalism Roshco, Bernard; Strouse, James C.; Carlson, Robert O. ...
Communication Booknotes,
11/1/1975, 1975-11-00, Letnik:
7, Številka:
3
Book Review, Journal Article
Bernard Roshco's Newsmaking (Chicago: University of Chicago Press, 1975-$10.00)
James C. Strouse's The Mass Media, public Opinion, and Public Policy Analysis (Columbus, Ohio: Charles E. Merrill Co., ...1975 -$7.95, paper)
Robert O. Carlson's Communications and Public Opinion: A "Public Opinion Quarterly" Reader (New York Praeger Special Studies, 1975-$20.00/7.95)
Marshall Fishwick (ed.) New Journalsim (Bowling Green, Ohio: Bowling Green University Popular Press, 1975-price not known, available in paper and cloth)
Page One: Major Events 1920-1975 as Presented in the New York Times (New York: Arno Press, 1975-$35.00, but intended mainly for sale at a discount price around $12.95)
Richard O'Connor's Heywood Broun: A Biography (New York: Putnam's, 1975-$8.95)
Face the Nation: The Collected Transcripts from the CBS Radio and Television Broadcasts (Metuchen, N.J.: Scarecrow Press, 1975-$27.50 each for Volumes 15-16-17 (broadcasts of 1972-73-74); $22.50 for Volume 14 (1971); $229.50 for Volumes 1-13 (covering 1954-70); and $20.00 for an index to Volumes 1-13)
Douglass Cater and Michael J. Nyhan's Public Television: Towards Higher Ground (Aspen Program on Communications, 360 Bryant St., Palo Alto, Calif. 94301-$3.00, paper)
Cable Communications and the States: A Sourcebook for Legislative Decision-Makers (Albany: New York State Senate (write c/o Warren M. Anderson, President pro tem), 1975-apparently free on request)
Donald F. Glut and Jim Harmon's The Great Television Heroes (New York: Doubleday, 1975-$7.95)
G. Howard Poteet's Radio (Dayton, Ohio: Pflaum Publishing, 1975-price not known, paper)
PDF
