Evaluation of backfilled solidification cracks in austenitic stainless welds in relationship to evaluation of hot cracking
Evaluation of backfilled solidification cracks in austenitic stainless welds in relationship to evaluation of hot cracking
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奥氏体不锈钢焊缝回填凝固裂纹的评估与热裂纹评估的关系
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
C. H. Lee
中科院分区：
文献类型：
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作者：
C. D. Lundin;C. H. Lee
本文论述了不锈钢凝固裂纹中的裂纹扩展现象对评定不锈钢焊接性的意义。根据以下方面对凝固裂纹的回填进行了系统评价：（1）初始凝固模式（奥氏体或铁素体）;（2）增强应变水平（2%和4%可变应变测试）;（3）不锈钢类型（316和347）;以及（4）焊缝中的位置和凝固裂纹的长度。裂纹扩展的程度是焊缝裂纹位置和凝固裂纹长度的函数，裂纹越短越窄，裂纹扩展的可能性越大。最大程度的温度梯度发生在焊缝中心，那里的温度梯度最浅。
This paper describes the significance of the backfilling phenomenon in solidification cracks on the evaluation of the weldability of stainless steels. Backfilling of solidification cracks was systematically evaluated in terms of: (1) Primary solidification mode (austenitic or ferritic); (2) Augmented strain levels (2 and 4% Varestraint Test); (3) Type of stainless steel (316 and 347); and (4) Location in the weld and length of solidification cracks. The extent of backfilling was found to be a function of the location of the crack in the weld and the solidification crack length, such that the shorter and narrower the crack, the greater is the potential for backfilling. The greatest extent of backfilling occurs at the center of the weld where the temperature gradient is most shallow.