Microstructural Evolution and Formation Mechanism of the Halo Ring in Resistance Spot Welded Third Generation Advanced High Strength Steel

Dileep Chandran Ramachandran, Adib Salandari-Rabori, Andrew Macwan, Elliot Biro
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Abstract

The microstructure of the halo ring has been studied in quenched and partitioned (Q&P) steel resistance spot welds. The TEM and EBSD characterizations revealed the presence of an upper bainitic microstructure in the halo ring of the three-sheet stack-up welds. Stalking faults accompanied by nano-twins were identified surrounding the cementite. Diffusion of carbon towards the molten weld pool during solidification led to the formation of bainite at the fusion boundary, triggered the localized softening.

Abstract Image

电阻点焊第三代先进高强度钢中晕环的微观结构演变和形成机理
研究了淬火和隔热(Q&P)钢电阻点焊中晕环的微观结构。TEM 和 EBSD 表征显示,三片堆焊焊缝的晕环中存在上贝氏体微观结构。在雪明碳酸盐周围发现了伴有纳米孪晶的缠结断层。碳在凝固过程中向熔融焊池扩散,导致在熔融边界形成贝氏体,引发了局部软化。
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