In-situ-phase analysis using synchrotron radiation of low transformation temperature (LTT) welding material

被引:11
作者
Kromm, Arne [1 ]
Kannengiesser, Thomas [1 ]
机构
[1] BAM Fed Inst Mat Res & Testing, D-12205 Berlin, Germany
来源
SOLDAGEM & INSPECAO | 2009年 / 14卷 / 01期
关键词
In-situ phase analysis; energy dispersive diffraction; phase transformation; Low Transformation Temperature filler wire; DIFFRACTION; SOLIDIFICATION;
D O I
10.1590/S0104-92242009000100010
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Cold cracking resistance is a relevant evaluation criterion for welded joints and affected by residual stresses which result from the welding procedure. Compressive residual stresses can thereby have a positive influence on preventing cracking. A unique possibility of generating compressive residual stresses already during the welding procedure is offered by the so-called Low Transformation Temperature (LTT) filler wires. Compared to conventional wires, these materials show decreased phase transformation temperatures which can work against the cooling-specific contraction. In consequence, distinct compressive residual stresses can be observed within the weld and adjacent areas. The strength of these fillers makes them potentially applicable to high-strength steel welding. Investigations were carried out to determine the phase transformation behaviour of different L TT-filler materials. Transformation temperatures were identified using Single Sensor Differential Thermal Analysis (SS-DTA). Additionally Synchrotron radiation was used to measure the transformation kinetics of all involved crystalline phases during heating and cooling of a simulated weld thermal cycle.
引用
收藏
页码:82 / 88
页数:7
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