摘要:
利用金相显微镜、扫描电子显微镜及附带EDS系统和透射电子显微镜研究了碳对C-1.5Mn-2.5Ni-0.5Cr-0.5Mo高强钢焊缝金属组织和性能的影响.结果表明,随着C元素含量的提高,焊缝金属的主要组织由针状铁素体转变为板条马氏体,同时使马氏体板条更加细小.在焊缝金属溶液凝固过程中Mn,Ni元素发生偏析,导致原δ-铁素体柱状晶晶界附近Mn,Ni元素含量高于柱状晶心部,并且随着C元素含量增加Mn,Ni元素的偏析加重.另外,随着C元素含量的增加焊缝金属的强度和硬度增高,并且原δ-铁素体柱状晶界附近与柱状晶心部硬度差值也越来越大.
Abstract:
The microstructure and properties of weld metal with three amount of carbon were investigated by means of optical microscopy,scanning electron microscopy with EDS and transmission electron microscopy.The results indicate that the dominant microstructure changes from the acicular ferrite to the lath martensite and the width of martensite lath is much more finer with the increase of carbon content.In addition,with increasing carbon content in weld metal,the Mn and Ni segregations become worse,the hardness and strength of weld metal increase,and the hardness differences of prior δ-ferrite columnar boundary region and prior δ-ferrite columnar core are increased.
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