Scholarlink

<p>The temperature field of austenitic stainless steel narrow gap girth weld and nickel-based alloy over-layer is carried out respectively. The microstructure solidification, microsegregation, and microhardness are analyzed by SEM, EDS, and OM. The average microhardness of the austenitic stainless steel at RW, FW, and CW is 207 HV, 208 HV, and 207 HV respectively, the average microhardness at the center of RW, FW, and CW is 191 HV, 190 HV, and 194 HV respectively. Austenitic stainless steel, its girth weld CW and nickel-based alloy over-layer 1 (welding speed v: 0.54&#xa0;mm/s) boundary position FTZ, is prone to ITZ, martensite zone, hot crack, and decarburization layer, and it is easy to form crack source in ITZ tip area. The nickel-based alloy over-layer 1 is mainly composed of the γ phase, and its grain morphology is various. The columnar crystals and equiaxed crystals in different regions are distributed irregularly, crystal cracks, and hot cracks are prone to occur. At the position of over-layer 2 (welding speed v: 0.54&#xa0;mm/s) in nickel-based alloy over-layer, it is competitive growth of dendritic crystal zone and cellular crystal zone, epitaxial growth of equiaxed crystal zone and cellular crystal zone. Contact growth of cellular crystal zone and cellular crystal zone is occurred.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The solidification process and mechanical behavior of the austenitic stainless steel joint-nickel base alloy over-layer based on GTAW-P/SMAW welding temperature field

  • 期刊论文

  • 发表日期：

    2025年10月22日

查看全文
  • Xilong Zhao,
  • Kangming Ren,
  • Ming Zhao

摘要

The temperature field of austenitic stainless steel narrow gap girth weld and nickel-based alloy over-layer is carried out respectively. The microstructure solidification, microsegregation, and microhardness are analyzed by SEM, EDS, and OM. The average microhardness of the austenitic stainless steel at RW, FW, and CW is 207 HV, 208 HV, and 207 HV respectively, the average microhardness at the center of RW, FW, and CW is 191 HV, 190 HV, and 194 HV respectively. Austenitic stainless steel, its girth weld CW and nickel-based alloy over-layer 1 (welding speed v: 0.54 mm/s) boundary position FTZ, is prone to ITZ, martensite zone, hot crack, and decarburization layer, and it is easy to form crack source in ITZ tip area. The nickel-based alloy over-layer 1 is mainly composed of the γ phase, and its grain morphology is various. The columnar crystals and equiaxed crystals in different regions are distributed irregularly, crystal cracks, and hot cracks are prone to occur. At the position of over-layer 2 (welding speed v: 0.54 mm/s) in nickel-based alloy over-layer, it is competitive growth of dendritic crystal zone and cellular crystal zone, epitaxial growth of equiaxed crystal zone and cellular crystal zone. Contact growth of cellular crystal zone and cellular crystal zone is occurred.