What is it about?
Microalloying addition can significantly improve the mechanical properties of high strength steels. But how do they influence the austenite grain growth and microstructure evolution during welding process of modern high strength steels? This paper compares the roles of different microalloying elements, Nb, Ti and V on austenite grain growth and phase transformation at real welded and simulated HAZ.
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Why is it important?
Our findings show that different microalloying addition in the same strength level steels can cause different properties at coarse grained and fine grained heat affected zones, due to various austenite grain growth behaviors and microstructure composition. This work provides very good guidance to the alloy design, particularly microalloying addition, for modern high strength steels.
Perspectives
Our work has compared the different effects from microalloying addition on austenite grain growth and phase transformation at HAZ. The detailed austenite grain growth as a function of weld thermal cycle is simulated through induction equipment and final hardness and microstructure at simulated HAZ are in good agreement with real welded HAZ. This work has raised the attention to weldability changes from different microalloy addition in modern high strength steels.
Master Lei Zhang
BAM - Federal Institute for Materials Research and Testing
Read the Original
This page is a summary of: Austenite grain growth and microstructure control in simulated heat affected zones of microalloyed HSLA steel, Materials Science and Engineering A, September 2014, Elsevier,
DOI: 10.1016/j.msea.2014.06.106.
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