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试验结果及分析 1.不同钢种高温裂纹敏感性试验 (1)结晶裂纹图7为横向可调拘束试验法直接测得之最大结晶裂纹长度Lmax随外加应变量变化之规律。由最大裂纹长度和测得之焊缝中心的温度分布曲线得出了各钢种的BTR和凝固塑性曲线(图8),以及由此求出的CST值(图9,表2)。并同时列出能反映结晶裂纹敏感性的参数BTR和ε_(min)。如前所述,用CST作为评定材料结晶裂纹敏感性的指标,CST值越大,裂纹敏感性越小。因此,上述各钢种结晶裂纹敏感性由大到小排列次序为:A3→19Mn5→16Mr.→BHW-35→14MnMoV。
Test results and analysis 1. High-temperature crack sensitivity test of different steel (1) Crystal crack Figure 7 shows the law of the maximum crystal crack length Lmax as a function of the amount of external strain measured directly by the transversely adjustable confinement test method. The BTR and solidification ductility curves of the steels (Figure 8) and the CST values obtained therefrom were obtained from the maximum crack length and the measured temperature distribution of the weld center (Figure 9, Table 2). The parameters BTR and ε min that reflect the sensitivity of the crystal crack are also listed. As mentioned earlier, CST is used as an index to evaluate the material’s crystal crack sensitivity. The larger the CST value, the smaller the crack sensitivity. Therefore, the sensitivity of the above-mentioned various steel crystal cracks descending order: A3 → 19Mn5 → 16Mr. → BHW-35 → 14MnMoV.