摘要
以厚20mm的16Mn钢为母材,采用双丝自动埋弧焊工艺,在相同焊接速度和焊接线能量的条件下进行焊接。并在500℃、600℃、700℃进行了高温拉伸试验。分别对相应温度下热处理后的接头金属组织进行分析和硬度测试,研究了高温下焊接接头的力学性能。结果表明,高温拉伸试验中,随着温度升高,接头金属的抗拉强度下降,而延伸率和断面收缩率随温度的升高而增加。比较热处理后与常温下的焊接接头金属组织,发现热处理后铁素体组织减少,珠光体组织增多,铁素体组织的形态发生了变化。焊接接头金属硬度随着热处理温度的提高而增加。
The welding of 20 mm thick base metal 16Mn alloy steel is performed at the same welding speed and engery input by using the double wire automatic submerged arc welding process.The high temperature tensile tests of welded joint obtained are conducted at 500℃,600℃ and 700℃ ,respectively.The microstructure of these welded joints with heat-treatment at the relavant temperature chosen are analyzed, and the hardness of these welded joint metals are measured and studied.The results show that the high temperature tensile strength of these joints is decreased when the temperature is increased,but both the elongation percentage and rate of contraction of crose-section are augmented.The microstructure of the welded joints under high temperature are compared with the microstructure of the welded joint at ambient temperature.The amount of reduced ferrite and increased pearlite microstructure is found,the morphology of,ferrite mierostructure is changed.As the temperature of heat-treatment rises the hardness of these welded joint metals is increased.
出处
《电焊机》
北大核心
2010年第1期86-89,共4页
Electric Welding Machine
关键词
埋弧焊工艺
高温拉伸试验
拉伸强度
硬度
submerged arc welding process
high temperature tensile test
tensile strength
hardness
