Effect of boron on microstructure of intercritically heat affected zone (ICHAZ) treated modified 9CR-1MO steel weldments

M. Divya, C. R. Das, S. K. Albert, A. K. Bhaduri, B. S. Murty

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


In the present study, evolution of microstructures in intercritical heat affected zone (ICHAZ) of boron added Mod 9Cr-lMo and Mod9Cr-lMo steel is investigated through heat treatment at875°Cfor different durations. Microstructural characterization of these heat treated specimens show that in B added Mod. 9Cr-lMo steels, lath morphology and original prior austenite grain boundaries were present even after prolonged exposure to the intercritical temperature. Whereas, in Mod 9Cr-lMo steel complete grain refinement and recovered lath martensite was observed. The mechanism of reconstitution of prior austenite grain with lath martensite having similar orientation in B added Mod 9Cr-lMo steel is attributed to a phenomenon so called as "austenite memory effect".
Original languageEnglish
Title of host publication Proceedings of Heat Treatment and Surface Engineering
EditorsS. R. Bakshi , M. Kamaraj , U.K. Mudali , T. S. Sudarshan , B. Raj , B. S. Murty
Publication date2013
Publication statusPublished - 2013
Externally publishedYes
Event1st Conference and Exhibition on Heat Treatment and Surface Engineering - Chennai Trade Centre, Chennai, India
Duration: 16 May 201318 May 2013


Conference1st Conference and Exhibition on Heat Treatment and Surface Engineering
Location Chennai Trade Centre


  • Boron added Mod9Cr-lMo steel
  • ICHAZ simulation
  • Memory effect

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