THERMOCALC CRACKED CRACKED

For a subset of compositions, tensile tests were Hardness tests and Charpy V-Notch (CVN) tests at 100вЊ. The mechanical behavior of all steels in the as-cast state was characterized by The amount of allotriomorphic ferrite, when present, increased with increasing silicon andДecreasing manganese. Light Optical Microscopy (LOM) and Scanning Electron Microscopy (SEM) confirmed that granular bainite/acicular ferrite were the major constituents of matrix Nine ingots with compositions of 0.2wt.%C, 2.5-3.0wt.%Mn and 0.5-3.0wt.%Si were lab cast and characterized by their microstructure and mechanical properties in the as-cast state. These models served as baseline to define the levels of Mn and Si for lab scale studies. Two thermodynamic/kinetic models were developed in Thermo-Calc and DICTRA to analyze the effects of Mn and Si on microstructure development with emphasis on ferrite growth. Cracks propagate along ferrite allotriomorphs preferentially.

THERMOCALC CRACKED CRACKED

It was found that microstructure of cracked and non-cracked slabs are different, with cracked slabs presenting ferriteДЄllotriomorphs at prior austenite grain boundaries (PAGB) that were correlated with toughness loss on impact test. This cracking phenomenon happens in high silicon containing industrial slabs, so microstructure and properties of production scale slabs were studied through impact test (Charpy V-notch). Levels of C, Mn and Si in new AHSS grades lead to a complex evolution of microstructure upon solidification and cooling and can lead to slab cracking. This project links properties and performance in as-cast condition for advanced high strength steel (AHSS) by comparing silicon content and microstructure to mechanical properties.

Thermocalc cracked