Author S.T. TU
,
J.M. Gong and X. Ling Nanjing University of Chemical Technology
,
Nanjing 210009
,
ChinaManuscript received 18 October 1998
金属学报(英文版)
In order to interpret the test results of crossweld specimens for application in practical welded components, the present paper studies the high temperature behavior of laboratory cross weld specimens in terms of the uniaxial material tests and numerical simulations. It is found that the crossweld specimen may be used for the high temperature strength assessment, but can hardly be used for life assessment of the practical welded components, which depends on the loading conditions of the components.
关键词:
high temperature
,
null
,
null
,
null
,
null
Yu. N. Sarave
,
O. I.Shpigunova(Institute of Shength Physics and Materials Science
,
Siberian Branch
,
Russian Academy Of Sciences
,
Tom-sk
,
Russia)
金属学报(英文版)
The purpose of computer-aided design of new adaptive pulsed arc technologies of welding is: to de- sign optimum algorithms of pulsed control over main energy parameters of welding.It permits:to in- crease welding productivity, to stabilize the welding regime, to control weld formation,taking into ac- count its spatial position, to proveal specie strength of the welded and coatings. Computer- aided design reduces the time of development of new pulsed arc technology:provides the optimization of technological referes according to the operating conditions of welded joints,the prediction of the ser- vice life of the welds.The developed methodology of computer-aided design of advanced technologies, models, original software, adaptive algorithms of pulsed control, and spend equipment permits to regulate penetration,the weld shape, the sizes of heat - affected zone; to predict sired properties and quality of welded joints.
关键词:
pulse
,
null
,
null
,
null
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
杨辉
,
夏爽
,
张子龙
,
赵清
,
刘廷光
,
周邦新
,
白琴
金属学报
doi:10.11900/0412.1961.2014.00552
通过拉伸变形5％及1100℃退火30 min的晶界工程(GBE)处理工艺,将304奥氏体不锈钢低∑重合位置点阵(CSL)晶界比例提高到75％ (Palumbo-Aust标准)以上,形成大尺寸的“互有Σ3n取向关系晶粒的团簇”显微组织.采用钨极气体保护焊焊接样品,对焊接后样品的HAZ区域进行显微组织表征和耐腐蚀性能测试.结果表明,GBE处理过的304奥氏体不锈钢具有较好的晶界网络稳定性,HAZ区域内仍具有高比例低CSL晶界,并且晶粒尺寸并未明显变大.在晶间腐蚀浸泡实验和电化学动电位再活化法(EPR)测试中,GBE处理的样品HAZ敏化区都表现出了更好的耐腐蚀性能,表明晶界工程可以有效改善304奥氏体不锈钢焊接热影响区耐晶间腐蚀性能.
关键词:
304奥氏体不锈钢
,
晶界工程
,
热影响区
,
晶间腐蚀
,
焊接
李克俭
,
蔡志鹏
,
李轶非
,
潘际銮
金属学报
doi:10.11900/0412.1961.2015.00590
采用热模拟的方法研究了FB2钢(一种新型9％Cr马氏体耐热钢)中Laves相在焊接热循环中的演化行为.首先借助SEM观察到存在于原始供货状态下的FB2钢中尺寸在微米级别的Laves相颗粒;进一步的分析表明,这些Laves相的出现是由铸造过程中的枝晶偏析导致的.焊接热模拟实验结果表明,在加热过程中,Laves相与基体γ-Fe发生共晶反应导致的组分液化会给FB2钢热影响区带来热裂倾向;在冷却后的样品中发现了一些网状的共晶组织,利用SEM/EDS和TEM分别得到了该共晶组织的成分信息和结构信息,确定该共晶组织的2个组分为x相和γ-Fe.在此基础之上,较为详细地分析了不同峰值温度热模拟后样品中共晶组织的形成过程,解释了共晶组织不同形貌的产生原因.
关键词:
FB2钢
,
Laves相
,
组分液化
,
x相
,
热裂倾向
,
焊接
