Primary Widmanst ̈atten ferrite either directly grows from the austenite grain surfaces, whereas secondary Widmanst ̈atten ferrite develops from any allotriomorphic ferrite that may be present …
Acicular Ferrite Formation and Its Influencing Factors-A Review
2016年12月31日 · Acicular ferrite is a microstructure nucleating intergranularly on non-metallic inclusions and forming an arrangement of fine, interlocking grains. This structure is known to …
Acicular Ferrite - an overview | ScienceDirect Topics
A variety of morphologies of these products including Widmanstätten ferrite, upper bainite, lower bainite and carbide-free bainite, as well as granular bainite and the so-called ‘ acicular ferrite …
Microstructure characterization and its relationship with …
2021年1月1日 · According to Svensson [72], low alloyed C–Mn weld metals presenting an ultimate tensile strength (UTS) up to 600–700 MPa, show a microstructure composed of …
Widmanstätten ferrite - University of Cambridge
Beautiful image of Widmanstaetten ferrite plates emanating from a prior austenite grain boundary; the remaining matrix is now pearlitic. Micrograph courtesy of Eng. Rolando M. Núñez Monrroy …
Effect of arrangement of acicular ferrite in a Widmanstatten ...
1989年11月1日 · The effect of the morphology and distribution of ferrite, especially acicular ferrite in a Widmanstatten structure, on the fracture behaviour of mild steel at low temperatures is …
Role of Lanthanum Addition on Acicular Ferrite Transformation
7) While the aligned ferrite laths, such as coarse bainite and widmanstatten, can provide easy routes for crack propagation, reducing the impact toughness. The formation of AF is the …
In this paper, the nature of the fine interlocking acicular ferrite microstructure in HSLA steel weld metals is investigated. The results strongly suggest the acicular ferrite is comprised of …
The acicular structure of Widmanstifften ferrite has not found practical application and has not been adequately studied, although the inherited effect of this structure in lowering the
Widmanst/itten ferrite formation is promoted by a coarse austenite grain size, tS-9,14J6'231 which makes it difficult for ferrite allotriomorphs to grow completely across the austenite grains during …