姜勇
,
巩建鸣
,
汤鹏杰
腐蚀与防护
从断口宏观特征、材质、断口电镜形貌以及微观组织等方面对乙烯裂解炉对流段304H盘管焊接接头开裂原因进行了分析.结果表明,焊接热影响区发生敏化,导致抗腐蚀性能下降,在碱、氯离子以及焊接残余应力的综合作用下发生了应力腐蚀开裂.
关键词:
乙烯裂解炉
,
焊接热影响区
,
应力腐蚀开裂
,
敏化
乔桂英
,
韩杨
,
韩秀林
,
谷雨
,
赵波
,
肖福仁
钢铁研究学报
doi:10.13228/j.boyuan.issn1001-0963.20130422
采用Gleeble-3500热模拟试验机模拟研究了两种典型的焊接热输入条件下高铌高强管线钢焊接热影响区的组织和性能分布,结果表明:高铌高强管线钢焊接热影响区的硬度高于母材的硬度,没有明显的软化现象;但临界两相区及焊接粗晶区的韧性显著恶化.临界两相区韧性降低是原奥氏体晶界处形成尺寸较大的链状M/A岛所致;而焊接粗晶区则是由于原奥氏体晶粒粗化及混晶,以及冷却后形成粗大的贝氏体及贝氏体边界处尺寸较大的M/A岛所致.在高铌钢中,高的合金含量所引起碳当量的升高是导致韧性降低的主要原因.
关键词:
高铌高强管线钢
,
焊接热影响区
,
韧性
,
M/A岛
师仲然
,
Fahlstr(o)m K
,
Hutchinson B
,
Komenda J
,
Lindh-Ulmgren E
,
Martin D
,
BeladiH
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2015.03.021
研究了结构钢单道次焊接接头,尤其是靠近融合线位置的粗晶热影响区(CGHAZ)的组织和力学性能.通常,这个区域的韧性比母材和焊缝金属的韧性要低很多,所以CGHAZ是最容易发生断裂的薄弱位置.重点关注钒微合金化钢板,并且与相同强度级别的铌微合金化钢板进行对比.为了充分利用钒的强化效果,有必要将氮含量提高至0.01％;为优化钢的性能,必须考虑钒与氮的配合.
关键词:
钢
,
钒
,
焊接
,
热影响区(HAZ)
,
韧性
,
组织
K.K. Zhang
,
D.R. Chen
,
J. Xue
,
D. W. Sun and H.C. Li( 1) Department of Materials Engineer
,
Xi'an Jiaotong University
,
Xi'an 710049
,
China 2) Luoyang Institute of Technology
,
Luoyang 471039
,
China 3) CITIC Heavy)
金属学报(英文版)
Base on a vast amount of testing and calculations for the welding thermal cycling curves of different testing points in fusion welding (TIG welding, gas welding) HAZ of zinc-based alloy with low melting points, this paper defines the welding thermal cycle parameters of microstructure stimulation of HAZ by zinc-based alloy fusion welding process. On the principle of which the microstrnct,are and harkness of the testing points in simulation specimens are basically correspondence with that of actual welding HAZ, the microstructure simulation of testing points Tm=370O℃. 305℃) of ZA12 alloy by fusion welding is carried out by the means of omhic-heating welding thermal simulation tester. The study results of the abrasion-resistance of simulation specimens HAZ by fusion welding process indicates that the abmsion-resistance is closely related to the form of eutectoid microstructure in or in the structure.
关键词:
zinc-based alloy
,
null
,
null
,
null
,
null
Q. F. Wang
,
J. H. Liu
,
Z. Y. Li
,
P. H. Li
,
G. F. Zhou and X. Chen( 1) Huazhong University of Sci. & Tech.
,
Wuhan 430074
,
China 2) Technology Center of WISCO
,
Wuhan 430080
,
China)
金属学报(英文版)
The microstructure and properties of stmulated heat affected zone (HAZ) of laser welded ULCB600 steel were investigate by applying the simulation technique with gleeble - 2000 dynamic thermal - me - chanical simulator.The influence of the preheat condition on the microstructure and properties of simu- lated HAZ of laser welded plate was also studied in order to evaluate the feasibility of reducing arisk that the ductility and toedness of HAZ may be poor by using preheat treatment.The results indicate that the grain size of laser - welded HAZ simulated is very small no matter if there is preheat, the toughness of simulated HAZ is therefore improved comparing to the base metal,and there is no obvious brittle - ductile transition in the range from - 80℃ to 20℃. The TEM analyses of sub -microstruc- ture also discover that microstructure constituent of both simulated HAZ is dominative lath martensite. However, the shaf of martensite is relatively coarse,and the dislocation density is relatively high for simulated HAZ with 200℃ preheat because of slower cooling rate. Combination of these tow factors is responsible for farer bardness and better toughness of simulated HAZ with preheat condition.
关键词:
physical simulation laser beam welding
,
null
,
null
