首页> 美国政府科技报告 >Effect of aging at 343(degree)C on the mechanical properties and microstructure of type 308 stainless steel weldments.
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Effect of aging at 343(degree)C on the mechanical properties and microstructure of type 308 stainless steel weldments.

机译:343(℃)时效对308型不锈钢焊件力学性能和显微组织的影响。

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The effect of long-term aging at intermediate temperatures on the mechanical properties of stainless steel welds has been studied. Three type 308 multipass shielded metal-arc welds with ferrite levels of 4, 8, and 12% were aged up to 20,000 h at 343C. Tensile tests showed little effect of aging on either the yield or ultimate tensile strengths, but the impact toughness was significantly degraded. The extent of the degradation increased with increasing ferrite content and increasing aging time. Examination of the microstructure with transmission electron microscopy and atom probe field-ion microscopy revealed that the ferrite phase had undergone spinodal decomposition as a result of aging. In addition, G-phase particles were observed at dislocations, and finer G-phase particles were homogeneously distributed throughout the ferrite phase. The changes in the mechanical properties and the fractography are discussed in light of the observed changes in the microstructure.

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