Paper Title:
Test to Characterize the Machining Strength Property for the AISI 316L Steel
  Abstract

This paper explores the effect of grain size on machining strength in an Fe-Cr-Ni alloy (AISI 316L). Ideal grain growth law [1], was used to obtain the activation energy level for this steel, which was 185 kJ.mol-1 [2]. The initial grain size was measured (12 μm) and considering these values, both temperature and time values needed to achieve a final grain size ten times larger than the initial one, could be calculated, which were 1200°C and 2 hours. Ternary phase diagram analysis showed that austenite was stable at this temperature. Following, samples of 200 mm length were annealed and quenched in water to prevent any formation of sigma (μ) phase. Annealed and as-received bars were then used to compare their machining strength. Results showed that the machining strength is higher in the as received condition than the one after annealing (127 μm). It may be concluded that the bigger the grain size, the lower its machining strength. It is believed that this is caused by the pile-up of dislocations on grain boundaries, since this material exhibits large plastic deformation before fracture.

  Info
Periodical
Chapter
Chapter 2: Material Science and Engineering
Edited by
Honghua Tan
Pages
604-611
DOI
10.4028/www.scientific.net/AMM.138-139.604
Citation
N. L. Coppini, J. C. Dutra, E. A. Baptista, F. A. P. Da Silva Fortunato, F. A. A. Ferreira, D. Coccumazzo, "Test to Characterize the Machining Strength Property for the AISI 316L Steel", Applied Mechanics and Materials, Vols. 138-139, pp. 604-611, 2012
Online since
November 2011
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$32.00
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