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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.2; Jul 7-11, 2003; Leganes, Madrid, Spain >CRITERIA FOR WELDABILITY ASSESSMENT OF AUSTENITIC STAINLESS STEELS
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CRITERIA FOR WELDABILITY ASSESSMENT OF AUSTENITIC STAINLESS STEELS

机译：奥氏体不锈钢的可焊性评定标准

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摘要

Hot cracking tests such as the Varestraint test are widely used for evaluating weld solidification and heat-affected zone cracking of austenitic stainless steels. Correlation between results of such simulative tests and actual practice is important because close assessment of weldability is required in welding cracking-sensitive materials. Several stainless steels including 316L, 316L(N) and a fully austenitic stainless steel D9 were evaluated using longitudinal and transverse Varestraint tests. These materials were also tested using the Finger Test, which simulates the strain situation during actual welding. Varestraint test results were quantified in terms of brittle temperature range (BTR) and crack length criteria. The results showed that cracking assessment using BTR was a strong function of WRC Cr_(eq)/Ni_(eq) ratio, while total crack length (TCL) showed high variability and scatter. Cracking assessment using TCL was improved by normalising with weld width, which reduced variability due to bead geometry. Results of the finger test showed excellent correlation with the Cr_(eq)/Ni_(eq) ratio and were more discriminatory for a highly susceptible fully austenitic material such as D9. The results of this study show how Varestraint tests can be used for weldability assessment with a high degree of confidence.
机译：热裂纹测试（例如Varestraint测试）被广泛用于评估奥氏体不锈钢的焊接凝固和热影响区裂纹。这种模拟测试的结果与实际操作之间的相关性很重要，因为在焊接易裂开的材料中需要仔细评估可焊性。使用纵向和横向Varestraint测试对包括316L，316L（N）和完全奥氏体不锈钢D9在内的几种不锈钢进行了评估。这些材料也使用手指测试进行了测试，它可以模拟实际焊接过程中的应变情况。 Varestraint测试结果根据脆性温度范围（BTR）和裂纹长度标准进行量化。结果表明，使用BTR进行开裂评估是WRC Cr_（eq）/ Ni_（eq）比的强大函数，而总裂纹长度（TCL）则显示出较高的变异性和分散性。通过对焊缝宽度进行归一化，可以改善使用TCL进行的裂纹评估，从而降低了由于焊缝几何形状而引起的变化。手指测试的结果显示与Cr_eq / Ni_eq比率具有极好的相关性，并且对于高度敏感的完全奥氏体材料（例如D9）具有更大的区分性。这项研究的结果显示了Varestraint测试可如何高度可靠地用于可焊性评估。

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