奥氏体化合金元素Mn和Ni对FV520B焊缝组织与力学性能的影响

Microstructure and Mechanical Properties of FV520B Affected by Austenitizing Elements Mn and Ni

采用金相观察及扫描电镜(SEM)等研究了奥氏体化合金元素Mn和Ni对FV520B马氏体不锈钢的焊缝组织及力学性能的影响。结果表明,FV520B不锈钢的焊缝组织以回火马氏体为主,随着合金元素增加,焊缝组织变得更加细小。Mn,Ni元素能够有效提高焊缝中奥氏体的含量。合金元素对焊缝强度的影响较小,但当同时添加Mn,Ni元素时,焊缝抗拉强度和屈服强度得到提高。Mn,Ni元素能够通过提高焊缝奥氏体量改善焊缝的冲击韧度。相对于Mn元素,Ni元素提高焊缝韧性的效果更好。

Metallographic observation and SEM graphic analysis were applied to the research of the microstructure and mechanical properties of FV520 Baffected by austenitizing elements Mn and Ni.The results show that the microstructure of FV520 B stainless steel is mainly tempered martensite.With the increase of the alloy elements,the microstructure becomes finer.Mn and Ni can effectively improve the content of austenite in the weld.The effect of alloying elements on the weld strength is small,but the tensile strength and yield strength of the welded joint can be improved when the Mn and Ni elements are added.Mn and Ni elements can improve the impact toughness of the weld by increasing the volume of the austenite.Relative to the Mn element,the Ni element improves the weld toughness better.