Abstract The mechanical and microstructural effects induced by high and low heat input of autogenous Gas Tungsten Arc Welding (GTAW) process in Fe-22Mn-1.8Al-1.2Si-0.57C TWIP steel microalloyed with titanium (TWIP-Ti) were evaluated through weld experiments. Different butt joints preparations in TWIP-Ti steel 5.8 mm thickness plates were used. A Finite Element (FE) model was applied to evaluate the deformation during welding process. The peak temperatures estimated numerically by the FE model were correlated with microhardness measurements carried out in high and low heat input welds. The lack of segregation of Mn and C at the melting zone interface contributed to avoid the hot-cracking in the welded joints at high and low heat input. The heterogeneous grain size microstructure in the welded specimens was affected by the heat input, which was correlated with the heat affected zone hardness measurements. An increase in both yield strength and ultimate tensile strength was measured in the low heat input weld as a result of the lack of hot cracking in the FZ-HAZ interface and the heterogeneous grain size distribution.

中文翻译：

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含Ti TWIP钢焊接性的实验和有限元研究

摘要 通过焊接评估了高低热输入对 Fe-22Mn-1.8Al-1.2Si-0.57C 钛微合金化 TWIP 钢 (TWIP-Ti) 自生钨极电弧焊 (GTAW) 工艺的机械和显微组织影响。实验。使用 TWIP-Ti 钢 5.8 mm 厚板中的不同对接接头制备。应用有限元 (FE) 模型来评估焊接过程中的变形。由有限元模型数值估计的峰值温度与在高和低热输入焊缝中进行的显微硬度测量相关。熔区界面处Mn和C没有偏析有助于避免焊接接头在高低热输入下的热裂纹。焊接试样中的不均匀晶粒尺寸显微组织受热输入的影响，这与热影响区硬度测量值相关。由于 FZ-HAZ 界面没有热裂纹和不均匀的晶粒尺寸分布，在低热输入焊缝中测量到屈服强度和极限抗拉强度均有所增加。