Predicting Transient Softening in the Sub-Critical Heat-Affected Zone of Dual-Phase and Martensitic Steel Welds

Autor:	Christine Kaczynski, J.D. Embury, Y. Norman Zhou, Samuel Vignier, Emmanuel Lucas, Elliot Biro, Jospeh Robert Mcdermid
Rok vydání:	2013
Předmět:	Heat-affected zone Materials science Dual-phase steel Mechanical Engineering Metallurgy Metals and Alloys Laser beam welding Welding law.invention Mechanics of Materials law Martensite Materials Chemistry Tempering Spot welding Softening
Zdroj:	ISIJ International. 53:110-118
ISSN:	1347-5460 0915-1559
Popis:	To improve vehicle fuel economy and crash worthiness the automotive industry has been redesigning parts from advanced high strength steels such as dual-phase and martensitic steels. These steels have high strengths with the higher formability characteristics when compared to lower strength conventional steels of similar ductility. These steels derive their unique properties from their complex microstructures containing ferrite and martensite. During assembly welding, the martensite within the sub-critical region of the heat-affected zone tempers, which locally reduces mechanical properties. Although this phenomenon is well studied, it has yet to be quantified. The present work proposes a technique to measure the softening kinetics of dual-phase and martensite steels using rapid isothermal tempering. The resulting model was then validated by predicting the heat-affect zone softening that occurs in laser and resistance spot welds as well as by comparing the microstructures of the rapid tempered samples to the microstructures found in the sub-critical heat-affected zone of welded samples.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ad6b11e610faab0822141133c88c8a6 https://doi.org/10.2355/isijinternational.53.110 Zobrazit plný text záznamu