Based on thermodynamics calculation,the results of the formation temperature of MnS inclusions of non-quenched and tempered steel during heating process were discussed. It is shown that while the solid fraction is 0.9,MnS inclusions began to precipitate in the final stage of solidification.The solidification process of 49MnVS3 non-quenched and tempered steel during heating has been observed in situ using a confocal scanning laser microscope (CSLM),which agrees well with the thermodynamics calculation. MnS particles were coarsening during heating process,which would reduce the pinning effect on the austenite grain boundaries and bring about the sudden growth of some austenite grains in this stage.
参考文献
| [1] | S. MORITO;H. SALTO;T. OGAWA .Effect of austenite grain size on the morphology and crystallography of lath martensite in low carbon steels[J].ISIJ International,2005(1):91-94. |
| [2] | Z. GUO;N. KIMURA;S. TAGASHIRA .Kinetics and Crystallography of Intragranular Pearlite Transformation Nucleated at (MnS+VC) Complex Precipitates in Hypereutectoid Fe-Mn-C Alloys[J].ISIJ International,2002(9):1033-1041. |
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