Detection of crack nucleation and growth in tool steels using fracture tests and acoustic emission
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Fracture tests and Acoustic Emission (AE), a technique providing wave-like information, were coupled in this study in order to obtain in-situ data characterization of damage mechanisms. Characteristic AE signals were analyzed and related to micro-mechanical and damage mechanisms taking place in the microstructure. The occurrence of these signals varied depending on the considered steel in terms, for instance, of the quantity of registered signal or the stress at which they started to be recorded. The results of this investigation revealed the stresses at which crack nucleation and propagation processes started to occur in ingot- and powder-metallurgy tool steels with very different microstructural properties, and they provided very helpful information to understand the failure mechanisms acting in these steels.
KeywordsMicrostructure Micro-mechanics Damage Signal Failure Powder metallurgy
Field Emission-Scanning Electron Microscope
Acting stress intensity factor
Linear Elastic Fracture Mechanics
Geometrical correction factor
Authors from Fundació CTM Centre Tecnològic acknowledge the Catalan government for partially funding this work under grant TECCTA11-1-0006.
- 1.Picas I, Hernández R, Casellas D, Valls I (2010) Strategies to increase the tool performance in punching operations of UHSS. In: Proc of the IDDRG conference, Graz, Austria, pp 325–334 Google Scholar
- 3.Waller JM, Saulsberry RL, Andrade E (2009) Use of acoustic emission to monitor progressive damage accumulation in Kevlar® 49 composites. Nasa Technical Report Server. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090026552_2009026831.pdf Accessed 10 Apr 2012
- 7.Fukaura K, Ono K (2001) Acoustic emission analysis of carbide cracking in tool steels. J Acoust Emiss 19:91–99 Google Scholar
- 8.Yokoi D, Tsujii N, Fukaura F (2003) Effects of tempering temperatures and stress amplitude on low-cycle fatigue behavior of a cold work tool steel. Mater Sci Res Int 9:216–222 Google Scholar
- 9.Yamada K, Wakayama S (2009) AE monitoring of microdamage during flexural fracture of cermets. In: Proc international congress and exhibition EURO PM 2009, Copenhagen, Denmark, pp 247–252 Google Scholar
- 10.Martinez-Gonzalez E, Picas I, Casellas D, Romeu J (2010) Analysis of fracture resistance of tool steels by means of acoustic emission. J Acoust Emiss 28:163–169 Google Scholar
- 12.Newman JC, Raju IS (1984) Stress intensity factor equations for cracks in three dimensional finite bodies subjected to tension and bending loads. NASA Technical Memorandum 85793 Google Scholar