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Effect of abnormal grain growth on microstructure and mechanical properties of friction stir welded SPCC steel plates

机译：异常晶粒长大对搅拌摩擦焊接SPCC钢板组织和力学性能的影响

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摘要

Friction stir welded SPCC low carbon steel plates were subjected to isothermal annealing heat treatments at 600, 650, 675 and 700 ℃ for various holding times. All the welds showed abnormal grain growth (AGG) in both the stir zone and the thermal-mechanically affected zone after annealing for a critical time, regardless of the welding condition and annealing temperature. As a comparison, normal grain growth occurred in the base metal. The AGG developed very quickly and finally very coarse grain structure was formed in the joints especially that the extremely large grains propagated from the thermal-mechanically affected zone into the base metal. The steel joints showed a stable D2 {112} <111> simple shear texture in the stir zone and the texture did not change during the entire grain growth period, no matter before or after the occurrence of AGG. Due to the AGG, the hardness suddenly decreased in the stir zone and became lower than that of the base metal. The tensile tests also revealed a lower strength in the stir zone of the annealed sample. However, the specimen showed different fracture locations depending on the annealing time.
机译：搅拌摩擦焊接的SPCC低碳钢板在600、650、675和700℃下进行了不同保温时间的等温退火热处理。退火一段时间后，无论焊接条件和退火温度如何，所有焊缝在搅拌区和热机械影响区均显示出异常的晶粒长大（AGG）。作为比较，在贱金属中发生正常的晶粒生长。 AGG发展很快，最终在接头处形成了非常粗糙的晶粒结构，特别是极大的晶粒从热机械影响区传播到了母材中。钢接头在搅拌区显示出稳定的D2 {112} <111>简单剪切织构，无论在发生AGG之前还是之后，织构在整个晶粒生长期间都没有变化。由于使用了AGG，硬度在搅拌区突然降低，并变得低于贱金属。拉伸试验还表明，退火样品的搅拌区强度较低。但是，根据退火时间，试样显示出不同的断裂位置。

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