机械工程材料
MATERIALS FOR MECHANICAL ENGIMEERING
2015年1月第39卷第1期Vol.39No.1Jan，2015
焊接参数对T92/S30432异种钢焊接接头
室温力学性能的影响
赵雷"？，乔汉文”，梁军"，钟群鹏”，徐连勇”，肖德铭
（1.神华国华（北京）电力研究院，北京100025；2.北京航空航天大学，北京100191；
3.天津大学，天津3000724.天津电力建设公司，天津300012)
摘要：研究了焊接工艺参数对T92/S30432异种钢焊接接头室温力学性能的影响，并获得了最佳的焊接工艺。结果表明：层间温度、焊接层数、焊丝类型和焊接接头坡口角度对接头强度的影响不大；但低层间温度和多层多道焊可以提高T92钢侧热影响区的韧性；与ERNiCr-3焊丝相比， ERNiCrMo-3焊丝填充的接头T92钢侧热影响区其有较高含量的铁素体，从而使其冲击功下降；焊接接头冲击韧性随坡口角度增大而先增大后减小，并在35°时达到最高；焊后热处理温度为 760C时接头具有最高的强度和韧性；T92/S30432异种钢较佳的焊接工艺是采用ERNiCr-3焊丝
和较低层间温度，并严格控制焊层厚度且采用温度为760C的焊后热处理。关键词：异种钢接头；焊接参数；力学性能；超超临界机组；焊后热处理
中图分类号：TG115.21
文献标志码：A
文章编号：1000-3738(2015)01-0032-07
Effects of Welding Parameters onRoom Temperature Mechanical Properties of
T92/S30432DissimilarWeldedJoint
ZHAO Leil-, QIAO Han-wer , LIANG Jun', ZHONG Qun-peng',XU Lian-yong', XIAO De-ming
(1. Shenhua Guohua (Bejing) Electric Power Research Institute, Beijing 100025, China; 2. Beihang University, Beijing 100191,China; 3. Tianjin University, Tianjin 300072, China:
4. Tianjin Eleetric Power Construction Company, Tianjin 300012, China)
Abstract: The effects of welding parameters on room temperature mechanical properties of T92/S30432 dissimilar welded joint were investigated and the optimized welding parameters were obtained, The results reveal that welding interpass temperature, weld layers, filler metals and groove angles had little effects on strength of the joint, but low interpass temperature and more weld layers improved the impact toughness of heat-affected zonce(HAZ) at T92 steel side, Compared with ERNiCr-3 filler metal, the impact energy of HAZ at T92 steel side with ERNiCrMo-3 filler metal decreased due to a higher ferrite content. In addition, the impact toughness firstly increased and then decreased with increasing the groove angels and the highest impact toughness was obtained at 35°. Moreover, the best strength and toughness were obtained at post-weld heat treatment(PWHT) temperature of 760 C, Hence, for the aim of obtaining the better welding parameters for T92/S30432 steeis, ERNiCr-3 filler metal, a low interpass temperature, strict controlling weld layer thickness and (PWHT) treatment temperature of 760 C should be employed.
Key words: dissimilar welded joint; weld perameter; mechanical property; ultra-super critical unit:post-weld heat treatment(PWHT)
0引言
近年来，国内高参数、节能环保的超超临界收稿日期：2013-10-26；修订日期：2014-08-20
作者篇介：赵雷（1985一）男.河北石家庄人，工程师，博士。
·32· 万方数据
(USC)机组数量不断增多[1-3]，且今后一段时期内其建设比例还会进一步增加，这推动了我国电力事业的快速发展，使我国成为目前世界上超超临界机组发展最快的国家+]。目前，超超临界机组的蒸汽温度在600℃左右，为进--步提高热效率，机组蒸汽