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Heat treatment of laser-additive welded Ti_2AlNb joints: Microstructure and tensile properties

机译：激光添加Ti_2AlNb焊接接头的热处理：组织和拉伸性能

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摘要

The microstructure evolution and tensile properties of laser-additive welded Ti2AlNb joints under different heat treatments were investigated in this paper. The heat treatment was conducted in the B2 + O (HT1) and B2 + alpha(2) + O (HT2) phase field to obtain different microstructural characteristics. For HT1, due to the B2 - O transformation, the microstructure of heat affected zone was B2 + alpha(2) + O, B2 + residual alpha(2) + O, and B2 + O as the distance from the base metal increased. As for HT2, the microstructure of heat affected zone was composed of B2 + alpha(2) + rim-O + primary O + acicular O in the region close to the base metal, B2 + intergranular alpha(2) + transformed O + primary O + acicular O in the region close to the fusion zone. The fusion zone was composed of B2 + O laths after HT1, and B2 + intergranular alpha(2) + transformed O + primary O + acicular O after HT2. The joints composed of B2 + O phase exhibited higher tensile strength compared with the as-welded joints due to the strengthening effects of O phase. The intergranular alpha(2) phase formed during HT2 was detrimental for the tensile strength. The joints exhibited no plastic deformation at room temperature after both heat treatments on account of the lack of independent slip systems in the O phase. The ductility of the heat-treated joints at 650 degrees C was better than that at room temperature because more slip systems were activated in the O phase. Compared with the joints heat-treated in HT1, the joints after HT2 exhibited better ductility at 650 degrees C resulting from the coarse primary O laths and lower volume fraction of O phase.
机译：研究了在不同热处理条件下激光加成焊接Ti2AlNb接头的组织演变和拉伸性能。在B2 + O（HT1）和B2 + alpha（2）+ O（HT2）相场中进行热处理以获得不同的微观结构特征。对于HT1，由于B2-> O的转变，热影响区的微观结构为B2 + alpha（2）+ O，B2 +残余alpha（2）+ O和B2 + O，随着与母材的距离增加。至于HT2，热影响区的微观结构由B2 + alpha（2）+ rim-O +初级O +靠近贱金属的区域中的针状O组成，B2 +晶间alpha（2）+转化的O +初级O +针状O靠近融合区。融合区由HT1之后的B2 + O板条和HT2之后的B2 +晶间alpha（2）+转化的O +初级O +针状O组成。由B 2 + O相组成的接头由于O相的增强作用，与焊接后的接头相比具有更高的拉伸强度。 HT2期间形成的晶间alpha（2）相不利于拉伸强度。由于在O相中缺乏独立的滑动系统，两种热处理后的接头在室温下均未表现出塑性变形。由于在O相中激活了更多的滑移系统，因此在650摄氏度下进行热处理的接头的延展性优于在室温下的延展性。与在HT1中进行热处理的接头相比，在HT2之后的接头在650摄氏度下表现出更好的延展性，这是由于原始的O板条较粗和O相的体积分数较低所致。

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