Calculating the Susceptibility of Carbon Steels to Solidification Cracking During Welding
Calculating the Susceptibility of Carbon Steels to Solidification Cracking During Welding
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DOI：
10.1007/s11663-020-02021-5
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发表时间：
2021-01-02
影响因子：
3
通讯作者：
Kou, Sindo
中科院分区：
文献类型：
--
作者：
Xia, Chunzhi;Kou, Sindo
现有的焊接性试验结果表明，碳钢的凝固裂纹敏感性随碳含量的不同而有很大差异。为了分析C含量对磁化率的影响，考虑到间隙溶质C在Fe中的快速扩散，假定二元Fe-C合金的平衡凝固是近似的。首先，绘制了平衡冻结温度范围与C含量的关系曲线，并与实验结果进行了比较，但一致性不好。然后，尝试了最近提出的铝合金磁化率指数|dt/d(f(S))(1/2)|NEAR(f(S))(1/2)=1(T：温度；f(S)：分数固相)。计算了敏感指数与C含量的关系曲线。该曲线与碳钢焊接裂纹敏感性试验结果吻合较好。
Existing experimental results of weldability tests show the susceptibility of carbon steels to solidification cracking varies significantly with the C content. To analyze the effect of the C content on the susceptibility, equilibrium solidification of binary Fe-C alloys was assumed as an approximation in view of the rapid diffusion of the interstitial solute C in Fe. First, the curve of the equilibrium freezing temperature range vs. the C content was plotted and compared with the experimental results, but the agreement was not good. Then, the susceptibility index, i.e., |dT/d(f(S))(1/2)| near (f(S))(1/2) = 1 (T: temperature; f(S): fraction solid) recently proposed for Al alloys was tried. The curve of the susceptibility index vs. the C content was calculated. The curve agreed well with the experimental results of crack susceptibility tests of carbon steels in welding.