Paper Title:
Effect of Microstructural Evolution on Mechanical Properties of 55NiCrMoV7 Steel
  Abstract

55NiCrMoV7 steel is extensively used as mould steel. However, how to obtain a product combined with both high strength and good toughness is still a problem in the heat treatment process. In current study, a series of 55NiCrMoV7 steel specimens were quenched with different cooling rates to obtain martensite, lower bainite and upper bainite, then tempered at 600°C, 620°C and 650°C, respectively. The micrographs show the evolution of microstructure with the variation of cooling rates and tempering temperature. Mechanical properties test has revealed that, 1) at the same tempering temperature, the tempered martensite has the highest strength and hardness, while the tempered lower bainite has the best impact toughness; 2) at the same ratio of yield strength to tensile strength (YS/TS), the ductility and toughness of martensite are better than that of bainite. Furthermore, fractographs of impact specimens show the ductile and brittle fracture behavior for martensite and upper bainite respectively.

  Info
Periodical
Advanced Materials Research (Volumes 287-290)
Chapter
Building Materials
Edited by
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
Pages
848-852
DOI
10.4028/www.scientific.net/AMR.287-290.848
Citation
M. T. Fan, M. Y. Sun, D. Z. Li, "Effect of Microstructural Evolution on Mechanical Properties of 55NiCrMoV7 Steel", Advanced Materials Research, Vols. 287-290, pp. 848-852, 2011
Online since
July 2011
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Price
$32.00
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