Effect of Overmatching and Undermatching on Microstructure and Mechanical Properties of G115/T92 Dissimilar Steel Joint
摘 要
分别采用高、低匹配焊接材料对G115钢和T92钢进行了异种钢焊接,研究了高、低匹配对这两种接头显微组织和力学性能的影响。结果表明:两种接头的焊缝和热影响区组织均为典型的回火马氏体,高匹配接头中T92钢侧熔合线附近的δ-铁素体含量高于低匹配接头中的,平均体积分数均低于0.3%;高匹配接头T92钢侧、低匹配接头G115钢侧熔合区均存在钨、钴、钼、铜元素稀释现象;两种接头的截面显微硬度均呈"W"形分布,高匹配焊缝的硬度波动较大;低匹配接头的室温和650℃抗拉强度、屈服强度高于高匹配接头的,两种接头焊缝处的冲击韧性均最差;高匹配接头焊缝的冲击断裂机制为准解理断裂机制,低匹配接头焊缝的为微孔聚集断裂和准解理断裂的混合断裂机制。
Abstract
The dissimilar steel welding was conducted on G115 steel and T92 steel with overmatching and undermatching welding materials, respectively. The effects of overmatching and undermatching on the microstructure and mechanical properties of the two joints were investigated. The results show that the microstructures in weld and heat-affected zone of the two joints consisted of typical tempered martensite. The content of δ-ferrite near the fusion line at T92 steel side in the overmatching joint was higher than that in the undermatching joint. The average volume fractions of δ-ferrite were both less than 0.3%.The dilution of W, Co, Mo and Cu was observed in the fusion zone at T92 steel side in overmatching joint and at G115 steel side in undermatching joint. The microhardness profile on cross-section of the two joints was W-shaped, and the hardness fluctuation in the overmatching weld was relatively large. The tensile strength and yield strength at room temperature and at 650℃ of the undermatching joint were higher than those of the overmatching joint. The impact toughness in the weld of the two joints was the poorest. The impact fracture of the weld in overmatching joint showed a quasi-cleavage fracture mechanism and that of the weld in undermatching joint showed a microvoid coalescence/quasi-cleavage mixed fracture mechanism.
中图分类号 TG115.2 TG407 DOI 10.11973/jxgccl201810010
所属栏目 材料性能及应用
基金项目 国家重点研发计划项目(2017YFB0305205)
收稿日期 2018/6/25
修改稿日期 2018/8/22
网络出版日期
作者单位点击查看
备注李林平(1986-),男,陕西神木人,博士
引用该论文: LI Linping,LIANG Jun,ZHAO Lei,XU Lianyong. Effect of Overmatching and Undermatching on Microstructure and Mechanical Properties of G115/T92 Dissimilar Steel Joint[J]. Materials for mechancial engineering, 2018, 42(10): 51~57
李林平,梁军,赵雷,徐连勇. 高、低匹配对G115/T92异种钢接头组织与力学性能的影响[J]. 机械工程材料, 2018, 42(10): 51~57
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【3】LIU Z, BAO H, CHEN Z. G115 steel and its application for 600+℃ A-USC-PP[C]//8th International Conference on Advances in Materials Technology for Fossil Power Plants. Albufeira, Algarve:EPRI, 2016:1011-1018.
【4】ISEDA A, YOSHIZAWA M, OKADA H, et al. Development of 9Cr ferritic steel tube and pipe SAVE12AD for advanced power boilers[C]//The Thermal and Nuclear Power Generation Convention Collected Works.[S.l.]:Thermal and Nuclear Power Engineering Society, 2016:49-55.
【5】LUNDIN C D. Dissimilar metal welds:Transition joints literature review[J]. Welding Journal, 1982, 61(S2):58-63.
【6】张建强, 张国栋, 何洁,等. 马氏体/贝氏体耐热钢焊接接头的界面蠕变损伤行为[J]. 金属学报, 2007, 43(12):1275-1281.
【7】张建强, 李太江, 姚兵印,等. 马氏体/贝氏体异种耐热钢焊接接头界面蠕变失效数值模拟[J]. 机械工程学报, 2011, 47(10):64-69.
【8】张建强, 吴甦, 赵海燕,等. 10Cr9Mo1VNbN/12Cr1MoV异种钢焊接接头的蠕变损伤及界面失效[J]. 焊接学报, 2002, 23(2):75-79.
【9】黄咏梅. T91+12Cr1MoV异种钢焊材选用的工艺试验与分析[C]//2011年安徽省科协年会——机械工程分年会论文集. 合肥:[出版者不详],2011:183-186.
【10】陈国宏, 余新海, 刘俊建,等. T92/TP347H异种钢焊接接头的组织结构和力学性能[J]. 压力容器, 2010, 27(12):1-7.
【11】GONG Y, CAO J, JI L N, et al. Assessment of creep rupture properties for dissimilar steels welded joints between T92 and HR3C[J]. Fatigue & Fracture of Engineering Materials & Structures, 2011, 34(2):83-96.
【12】李新梅, 张忠文, 杜宝帅,等. 新型耐热HR3C/T92异种钢接头的显微组织和性能[J].机械工程材料,2013,37(9):33-36.
【13】KIM M Y, KWAK S C, CHOI I S, et al. High-temperature tensile and creep deformation of cross-weld specimens of weld joint between T92 martensitic and Super304H austenitic steels[J]. Materials Characterization, 2014, 97:161-168.
【14】赵雷, 乔汉文, 梁军,等. 焊接参数对T92/S30432异种钢焊接接头室温力学性能的影响[J]. 机械工程材料, 2015, 39(1):32-38.
【15】王斌, 梁军, 荆洪阳,等. 焊接材料对Sanicro25/T92异种钢接头组织及力学性能的影响[J]. 焊接技术, 2016(6):27-30.
【16】李林平, 梁军, 赵雷,等. G115/T92异种钢焊接接头的显微组织及力学性能[J]. 材料热处理学报, 2018,39(9):138-144.
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