Micromechanics of fracture in a NiCrMo alloy

✍ Scribed by A.N. Kumar; R.K. Pandey

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 962 KB
• Volume: 19
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(84)90019-5

✦ Synopsis

In a Ni-Cr-Mo steel, quenched and tempered at various temperatures, the critical stress and strain at fracture have been computed in the SEN bending fracture toughness specimens and the effect of triaxiahty factor on the fracture ductility has been studied. The experimental investigation included the tensile and fracture toughness (KJc, COD, Jrc) tests, quantitative microscopy for statistical size distribution analysis of inclusions, and the quantitative fractography. An attempt has been made to identify the effective inclusion size to characterize the microfracture process under uniaxial and biaxial loading situations and the mechanics of void expansion has been investigated. A quantitative relationship between the process zone size and material microstructure as well as fractographic features has been presented for the cleavage and the microvoid coalescence mode of fracture.