Microstructural evolution and solidification cracking susceptibility of grain boundary engineered fully austenitic stainless steel
Microstructural evolution and solidification cracking susceptibility of grain boundary engineered fully austenitic stainless steel
复制标题
晶界工程全奥氏体不锈钢的微观结构演变和凝固裂纹敏感性
DOI：
10.1007/s40194-020-00865-8
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发表时间：
2020
影响因子：
2.1
通讯作者：
H. Inoue
中科院分区：
文献类型：
--
作者：
S. Tokita;K. Kadoi;Y. Kanno;H. Inoue
奥氏体不锈钢的凝固开裂一直是一个严重的问题。由于凝固裂纹通常发生在凝固晶界，焊缝金属中的晶界特征分布(GBCD)会影响其凝固开裂敏感性。另一方面，焊缝金属中的柱状晶是由母材中的颗粒外延生长形成的。因此，可以通过控制母材的显微组织来降低焊缝金属的组织和开裂敏感性。研究了母材组织对焊缝组织和凝固裂纹敏感性的影响。通过热机械加工改变了310S不锈钢母材的GBCDs。用Trans-Varestraint试验评价了其凝固裂纹敏感性。与原始样品相比，经热机械处理的样品具有更大的重合点阵(CSL)晶界比率。此外，还发现该试件比原始材料更不容易产生凝固裂纹。GBCD分析表明，形变热处理样品中复杂的晶界形状和分布影响了凝固裂纹的萌生和扩展。
Solidification cracking has been a serious problem in austenitic stainless steels. Since solidification cracking often occurs at the solidification grain boundary, the grain boundary character distribution (GBCD) in the weld metal may affect the solidification cracking susceptibility. On the other hand, the columnar grains of the weld metal are formed by the epitaxial growth from the grains in the base metal. Therefore, it is expected that microstructure and cracking susceptibility of the weld metal can be reduced by controlling the microstructure of the base metal. In this study, the effect of microstructure of the base metal on the microstructure and solidification cracking susceptibility of the weld metal was examined. The GBCDs of the base metal of the type 310S stainless steel were changed by the thermomechanical process. The solidification cracking susceptibility was evaluated by the Trans-Varestraint test. The thermomechanically processed specimen had larger ratio of coincidence site lattice (CSL) boundaries compared with those of the as-received specimen. Moreover, the specimen was found less susceptible to solidification cracking than was the as-received material. The GBCD analysis indicated that the complex shape and distribution of the grain boundaries in the thermomechanically processed specimen affect the initiation and propagation of solidification cracks.
影响因子：
6
作者：
S. Kobayashi;S. Tsurekawa;Tadao Watanabe;G. Palumbo
通讯作者：
S. Kobayashi;S. Tsurekawa;Tadao Watanabe;G. Palumbo
影响因子：
4.5
作者：
H. Kokawa
通讯作者：
H. Kokawa