Interpretation of evaluation indices based on solidification cracking behavior by in situ observation in Trans-Varestraint test
Interpretation of evaluation indices based on solidification cracking behavior by in situ observation in Trans-Varestraint test
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Trans-Varestraint试验中基于原位观察凝固裂纹行为的评价指标解释
DOI：
10.1007/s40194-021-01223-y
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发表时间：
2022
影响因子：
2.1
通讯作者：
Saida Kazuyoshi
中科院分区：
文献类型：
--
作者：
Yamashita Shotaro;Saida Kazuyoshi
Varestraint试验已在多个领域用于评估热裂纹敏感性，并对材料热裂纹敏感性相关研究做出了重大贡献。从Varestraint试验中获得的评价指标包括裂纹数、裂纹总长度、最大裂纹长度、最小名义应变、脆性温度范围和温降临界应变率;然而，评价指标的详细意义尚未阐明。在这项研究中，有关凝固裂纹的起始和扩展的应变进行定量评估，通过观察凝固裂纹行为在跨变约束测试使用原位观察方法。实际上，在可变应变测试中加载到焊缝金属上的应变随着标称应变而增加。凝固裂纹发生在固液界面附近，然后向远离熔池的方向扩展。无论名义应变如何，凝固裂纹发生的起始应变是恒定的，并且扩展应变随名义应变而增加。这表明Varestraint试验中标称应变的变化会影响凝固裂纹长度;然而，凝固裂纹的起始应变在所有标称应变下都是恒定的，并且与裂纹长度无关。因此，可以得出结论，凝固裂纹的起始应变不能评估的基础上的常规安排的Varestraint测试。
The Varestraint test has been used in various fields for evaluating hot cracking susceptibility and has significantly contributed to studies associated with the hot cracking susceptibility of materials. Evaluation indices obtained from the Varestraint test include number of cracks, total crack length, maximum crack length, minimum nominal strain, brittle temperature range, and critical strain rate for temperature drop; however, the detailed significance of the evaluation indices is yet to be elucidated. In this study, the strain related to the initiation and propagation of solidification cracking is quantitatively evaluated by observing the solidification cracking behavior during the Trans-Varestraint test using an in situ observation method. In practice, the strain loaded onto the weld metal in the Varestraint test increases with the nominal strain. Solidification cracks occur near the solid–liquid interface and then propagate away from the weld pool. The initiation strain to solidification cracking occurrence is constant regardless of the nominal strain, and the strain for the propagation increases with the nominal strain. This suggests that a change in the nominal strain in the Varestraint test affects the solidification crack length; however, the initiation strain of the solidification crack is constant at all nominal strains and is independent of the crack length. Therefore, it is concluded that initiation strain of solidification cracking cannot be evaluated based on the conventional arrangement of the Varestraint test.
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