Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal
Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal
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DOI：
10.1007/s11661-017-4340-2
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发表时间：
2017-12-01
影响因子：
2.8
通讯作者：
Shinozaki, Kenji
中科院分区：
文献类型：
--
作者：
Kadoi, Kota;Shinozaki, Kenji
研究了化学成分，特别是铌含量、铬当量Cr-eq和镍当量Ni-eq对Schaeffler图中奥氏体单相区焊缝凝固裂纹敏感性的影响。使用热焊丝激光焊接工艺制造试样，在该区域中具有广泛不同的Cr当量、Ni当量和铌的组合物。裂纹长度和脆性温度范围（BTR）等敏感性分布在Schaeffler图上显示了凝固裂纹的高敏感性区域。铌的加入提高了磁化率，改变了磁化率在图中的分布。BTR分布与基于Scheil模型的凝固模拟计算的凝固温度范围（Δ T）分布吻合良好。Δ T随着合金元素如铌含量的增加而增加。由于分配行为的变化，Δ T的分布依赖于合金元素的类型。因此，奥氏体单相区的凝固裂纹敏感性取决于合金是否含有元素。磁化率在该区域的分布受Δ T的变化和铌的偏析行为随化学成分的变化所控制。(C)矿物、金属和材料协会和ASM国际2017
The influence of the chemical composition, especially the niobium content, chromium equivalent Cr-eq, and nickel equivalent Ni-eq, on the weld solidification cracking susceptibility in the austenite single-phase region in the Schaeffler diagram was investigated. Specimens were fabricated using the hot-wire laser welding process with widely different compositions of Cr-eq, Ni-eq, and niobium in the region. The distributions of the susceptibility, such as the crack length and brittle temperature range (BTR), in the Schaeffler diagram revealed a region with high susceptibility to solidification cracking. Addition of niobium enhanced the susceptibility and changed the distribution of the susceptibility in the diagram. The BTR distribution was in good agreement with the distribution of the temperature range of solidification (Delta T) calculated by solidification simulation based on Scheil model. Delta T increased with increasing content of alloying elements such as niobium. The distribution of Delta T was dependent on the type of alloying element owing to the change of the partitioning behavior. Thus, the solidification cracking susceptibility in the austenite single-phase region depends on whether the alloy contains elements. The distribution of the susceptibility in the region is controlled by the change in Delta T and the segregation behavior of niobium with the chemical composition. (C) The Minerals, Metals & Materials Society and ASM International 2017