【摘要】 采用焊接热模拟的方法研究了Mn元素含量对EH36船板钢焊接粗晶区组织与性能的影响.结果表明,Mn含量对EH36钢大热输入焊接粗晶区的低温韧性存在显著影响.Mn元素含量较高(1.58%)或较低(0.56%)时,粗晶区的低温韧性均差.当Mn含量等于1.20%时粗晶区的低温韧性最高.Mn含量对EH36钢大热输入焊接粗晶区的组织同样存在显著影响.Mn含量较低(0.56%)时,粗晶区的主要组织为粗大的先共析铁素体,其宽度约为30μm;而Mn含量较高(1.58%)时,粗晶区组织则以硬质相M-A岛状组织为主.先共析铁素体和硬质相M-A岛状组织共同决定着船板钢焊接粗晶区的韧性.更多还原

【Abstract】 The effect of Mn content on CGHAZ (coarse grain heat-affected zone) microstructure and properties of large heat input welding in EH36 ship steel were studied by thermal simulation method.The results show that Mn content has a significant effect on the low-temperature toughness of CGHAZ; the best low-temperature toughness in the CGHAZ is obtained when Mn content is 1.2%,but is deteriorated when the Mn content is higher (1.58%) or lower (0.56%).For the EH36 ship steels of large heat input welding,there is also a significant effect of Mn content on the microstructure of CGHAZ,which mainly is GBF (grain boundary ferrite) whose width is about 30 μm when the content of Mn is low (0.56 %),and on the other hand,while Mn content is high (1.58%),a large number of M-A constituent is formed in the CGHAZ.The toughness of CGHAZ is determined by both GBF and the horniness phase M-A.更多还原