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为研究应变强化对06Cr19Ni10不锈钢焊接接头低温冲击性能的影响,采用PAW+GTAW组合焊的焊接方法分别对δ=6 mm和δ=8 mm的奥氏体不锈钢06Cr19Ni10进行焊接,焊接完成后对部分焊件进行应变速率为3 mm/min、应变量为8%的应变强化处理。对应变强化前、后06Cr19Ni10奥氏体不锈钢焊接接头进行-196℃低温冲击试验,并用扫描电镜观察冲击试样的断口形貌。结果表明:两组试样应变强化前、后焊接接头的低温冲击吸收能量及侧向膨胀量均远大于标准规定的最低值,表明应变强化前、后的焊接接头合格且具有较好的韧性;焊件经应变强化后,焊缝的韧性得到提高,热影响区的韧性稍有降低。
In order to study the effect of strain hardening on the low temperature impact performance of 06Cr19Ni10 stainless steel welded joint, the welding of PAW + GTAW combination welding was carried out on the austenitic stainless steel 06Cr19Ni10 with δ = 6 mm and δ = 8 mm, respectively. The specimens were subjected to strain hardening at a strain rate of 3 mm / min and strain of 8%. Before strain hardening, the welded joints of 06Cr19Ni10 austenitic stainless steel were subjected to low temperature impact test of -196 ℃, and the fracture appearance of the impact specimen was observed by scanning electron microscope. The results show that the low temperature shock absorption energy and lateral expansion of the welded joints before and after strain hardening are much larger than the standard minimum values before and after strain hardening, indicating that the welded joints before and after strain hardening are qualified and have good toughness. After strain hardening of the weldment, the toughness of the weld is improved and the toughness of the heat affected zone slightly decreases.