Metallurgical and Materials Transactions B

, Volume 47, Issue 4, pp 2148–2156 | Cite as

Enhancement of Heat-Affected Zone Toughness of a Low Carbon Steel by TiN Particle

  • Yu ZhangEmail author
  • Xiaobao Li
  • Han Ma


Enhancement of heat-affected zone toughness of a weight percentage of 0.014 pct Ti-bearing low carbon steel by TiN particle was investigated. An increase in nitrogen weight percentage from 0.0031 to 0.0083 pct results in increasing of number density of TiN precipitates from 4 × 103 to 3 × 105/mm2, and reduces prior austenite grain size from 850 to 350 μm with a soaking of 1673 K (1400 °C) for 2000 seconds. Effective refinement of austenite grain prohibits formation of ferrite side plate and/or upper bainite, and densely distributed TiN particles promote intra-granular ferrite formation, which is accompanied by an increase of 40 K to 60 K (40 °C to 60 °C) in austenite decomposition temperature during continuous cooling process. The changes in transformed products improved impact toughness of heat-affected zone efficiently, ex., increase absorbed energy of less than 42 J to more than 320 J with a simulated t 8/5 of 550 seconds.


Ferrite Austenite Bainite Impact Toughness Acicular Ferrite 
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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  1. 1.Institute of Research of Iron and SteelSha-steelZhangjiagangChina

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