Fusion zone and heat affected zone cracking susceptibility of stabilised austenitic stainless steels
Fusion zone and heat affected zone cracking susceptibility of stabilised austenitic stainless steels
复制标题
稳定化奥氏体不锈钢的熔合区和热影响区开裂敏感性
DOI：
10.1179/stw.1998.3.1.17
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发表时间：
1998
影响因子：
3.3
通讯作者：
S. Sundaresan
中科院分区：
文献类型：
--
作者：
V. Shankar;T. Gill;S. Mannan;S. Sundaresan
用Varestraint热裂纹试验研究了三种稳定化不锈钢的熔合区(FZ)和热影响区(HAZ)的开裂行为。材料的凝固方式从完全奥氏体D9到初生奥氏体347和初生铁素体321。该材料在FZ和母材热影响区表现出较高的开裂敏感性。在焊缝金属HAZ中，347型是高度敏感的，而D9和321型是抗裂的。FZ的开裂行为可能与稳定化比(Nb，Ti)/C有关，而不是像未稳定化的不锈钢那样，与P+S含量和Creq/Niq比有关。事实上，使用CREQ/NIEQν对裂解数据进行分析。P+S含量图未显示出开裂敏感性的任何系统趋势。在母材HAZ中，347型和321型的高裂纹是由高杂质水平以及Nb和钛的存在引起的。在D9合金中，裂纹的发生要少得多。
Fusion zone (FZ) and heat affected zone (HAZ) cracking behaviour of three stabilised stainless steels were studied using the Varestraint hot cracking test. Materials ranged in solidification mode from fully austenitic D9 to primary austenitic 347 and primary ferritic 321. The materials exhibited high cracking susceptibility in the FZ and base metal HAZ. In the weld metal HAZ, type 347 was highly susceptible, while alloy D9 and type 321 were resistant to cracking. The FZ cracking behaviour could be related to the stabilisation ratio (Nb, Ti)/C rather than the P + S content and Creq/Nieq ratio, as in unstabilised stainless steels. In fact, analysis of cracking data using the Creq/Nieq ν. P + S content diagram did not reveal any systematic trend in cracking susceptibility. In the base metal HAZ, the high cracking in type 347 as well as in type 321 was found to be caused by the high impurity levels in conjunction with the presence of niobium and titanium. Cracking occurred much less in alloy D9.