Fusion Zone Microstructure Evolution of Al-Alloyed TRIP Steel in Diode Laser Welding
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- Xia Mingsheng
- Centre for Advanced Materials Joining, University of Waterloo State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute
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- Tian Zhiling
- State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute
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- Zhao Lin
- State Key Laboratory of Advanced Steel Processes and Products, Central Iron & Steel Research Institute
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- Zhou Y. Norman.
- Centre for Advanced Materials Joining, University of Waterloo
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TRansformation Induced Plasticity (TRIP) steels are promising materials to achieve a better combination of formability and strength than conventional steels due to their unique microstructural makeup. Though welding is a vital part of auto body manufacturing, the weldability of TRIP steels has some complex and poorly understood features, which has served to retard the growth of its applications in the automotive industry. In this study, autogeneous welds were carried out on Al-alloyed TRIP steel using a 4 kW diode laser. Both fusion zone solidification behavior and subsequent austenite transformation products were investigated with optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. In terms of solidification behavior, fusion zones solidified with high temperature δ-ferrite as the primary phase. Fusion zone microstructure at room temperature was composed of ferrite with a skeletal morphology characteristic of solidification, and austenite decomposition products almost all having a lath morphology. Skeletal ferrite covered about 30% fusion zone area. Upper bainite laths separated by retained austenite films comprised most of the transformed microstructure, about 65% of the fused area. Lower bainite with carbide particles dispersed in an aligned way, chunk shaped retained austenite, lath martensite and twinned martensite were also occasionally observed. The Al content was considered to be for a dominant influence on fusion zone microstructure evolution.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 49 (4), 746-753, 2008
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679225803776
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- NII論文ID
- 10021145705
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 9447307
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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