Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/5449
Title: MICROSTRUCTURE AND MECHANICAL PROPERTIES OF LOW CARBON LOW ALLOY MARTENSITE
Authors: Patwardhan, Arun Kumar
Keywords: METALLURGICAL MATERIAL ENGINEERING;MICROSTRUCTURE;LOW CARBON;LOW ALLOY MARTENSITE
Issue Date: 1979
Abstract: A critical survey of the literature,on low alloy high strength (LAHS) steels revealed that they are most usefully employed in the proof strength range of 775-850 MN/m2 where ever a combination of high strength coupled with good ambient - temperature and sub-zero temperature toughness is an essential requirement. Steels which normally cater to this range of proof strength are,(a) aircooled bainitic steels and, (b) quenched and tempered (Q and T) steels alloyed with Ni, Cr, Mo, V and Mn. Ausformed steels which could also be employed have been excluded since ausforming is confined only to those steels having transformation characteristics leading to 'bay' formation. The main drawback with the bainitic steels is that the stipulated level of toughness may not be attained because of the formation of unintended microconstituents such as (i) elongated oarbides surround-ing the bainitic ferrite regions and, (ii) the austenite-martensite (A M) constituent. Although the toughness can be improved upon by tempering, the effective proof strength is lowered to /4700 MN/m2. The major problem with the Q and T steels is the necessity of making adjust-ments in the composition for toughening the ferrite matrix and for eliminating temper-embrittlement. Further, the difficulty in, exercising control over carbide size, shape................
URI: http://hdl.handle.net/123456789/5449
Other Identifiers: Ph.D
Research Supervisor/ Guide: Mehta, M. L.
metadata.dc.type: Doctoral Thesis
Appears in Collections:DOCTORAL THESES (MMD)

Files in This Item:
File Description SizeFormat 
TH MMD 176002.pdf13.21 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.