摘要
采用不同类型合金粉进行FAB法埋弧焊试验,对比分析EH36钢FAB法埋弧焊接头的显微组织和性能.结果表明:经大线能量82.8~97.7 KJ/cm焊接后,EH36钢焊接接头未出现软化区,其接头强度均能满足船板焊接技术指标;但经大线能量97.7 KJ/cm焊接后,焊接接头低温冲击韧性显著降低.采用添加适量Mn、Ti合金元素的国产合金粉Fe-9,在Mn元素降低先共析铁素体相转变温度和Ti合金促进针状铁素体形核的联合作用下,即使采用较高线能量97.2 KJ/cm焊接,仍可抑制焊缝、熔合区先共析铁素体的相变反应,促进其针状铁素体的形成,提高FAB法埋弧焊焊缝、熔合区的韧性.
FAB submerged arc welding experiments were conducted on the steel EH36 using different alloy powders,respectively. The comparative research of microstructure and property on the joints were also studied. The results showed that the welding thermal cycles did not lead to softening in heat affected zone（HAZ） of the EH36 steel joint when the weld heat input of FAB were 82. 8 ~ 97. 7 KJ/cm,and the results of strength test of the welding joints also met the requirement of the shipbuilding plate welding standard test. But the low-temperature impact toughness of EH36 steel joint decreased heavily when the weld heat input of FAB was 97. 7 KJ/cm. However,the toughness of EH36 steel joint by FAB submerged arc welding with high welding heat input 97. 2 KJ/cm could also be improved when the domestic alloy powder Fe-9 by the proper addition of Mn and Ti elements were used. In the alloy powder Fe-9,the presence of Mn as an alloying element which stabilized the austenite decreased austenite-to-ferrite transformation temperature,and Ti provided active nucleation sites for acicular ferrite.The combined action of Mn and Ti in weld metal and fusion zone prohibited the growing of proeutectoid ferrite and promoted the formation of acicular ferrite.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2017年第6期746-750,共5页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
作者简介
刘磊（1984-）,男,工程师,研究方向为船舶高效焊接技术.Email：13774437589＠163.com
