低合金高强钢KMN焊接接头的低温性能  

Low-temperature properties of welded joints of KMN HSLA steel

作　　者：邱克强[1] 胡冰[1,2] 任鹤[1,2] 张思宇[2] 张立[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]沈阳鼓风机集团股份有限公司工艺部,沈阳110869

出　　处：《沈阳工业大学学报》2015年第6期634-638,共5页Journal of Shenyang University of Technology

基　　金：沈阳市科技局科技专项基金资助项目(F14-197-4-00)

摘　　要：针对离心压缩机叶轮制造用KMN钢的低温工作条件,研究了KMN钢的焊接工艺和焊后热处理技术.通过拉伸试验、低温冲击试验及显微组织观察等手段表征了焊接参数及焊后热处理技术对焊接接头性能的影响.结果表明,在相同的热处理状态下,当线能量为14.4 k J/cm时,焊接接头的性能最好.在线能量相同的情况下,随着回火温度的提高,焊接接头的屈服强度和抗拉强度均有所下降,而低温冲击功先上升后下降.采用E9018-B3L-Ni焊条焊接的KMN钢可满足-50℃低温工况的使用要求.Aiming at the low-temperature operating conditions of KMN steel used for manufacturing the impeller of centrifugal compressor, the welding process and post-welding heat treatment technology of KMN steel were investigated. The effect of welding parameters and post-welding heat treatment technology on the properties of welding joints were characterized with such means as tensile test, low-temperature impact test and microstructure observation. The results show that under the same heat treatment state, the welded joints have the best performance when the heat input is 14. 4 kJ/cm. With the same heat input, with increasing the tempering temperature, both yield strength and tensile strength of welded joints decrease, but the low-temperature impact energy firstly increases and then decreases. The KMN steel welded with the E9018-B3L-Ni welding electrode can meet the operating requirements in the low-temperature operating condition of -50℃.

关 键 词：低合金高强钢 低温冲击功 E9018-B3L—Ni焊条 回火温度 KMN钢 力学性能 焊接参数 热处理工艺 

分 类 号：TG146[一般工业技术—材料科学与工程]