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Effects of long term thermal aging on high temperature tensile deformation behaviours of duplex stainless steels

机译：长期热时效对双相不锈钢高温拉伸变形行为的影响

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摘要

Tensile deformation behaviours of unaged and thermal aged duplex stainless steels (DSS) were investigated at 350 degrees C in order to understand the effects of long term thermal aging on the high temperature deformation behaviours of DSS. After aging for 20 000 h, the strength of DSS has a slight increase, the plasticity has a considerable decline, and the tensile fracture transfers from ductile to brittle. Nanoindentation tests indicate that ferrite has a considerable increase in hardness, and austenite has only a negligible increase with aging time. Thermal aging embrittlement is primarily concerned with ferrite. After long term thermal aging, spinodal decomposition and G-phase precipitation occur in ferrite and these reactions result in the dramatic decline of the ferrite phases' deformation ability. Cleavage cracks can easily initiate and propagate in ferrite of long term thermal aged DSS.
机译：为了了解长期热时效对DSS高温变形行为的影响，研究了未时效和热时效双相不锈钢（DSS）在350摄氏度下的拉伸变形行为。老化2万小时后，DSS的强度略有增加，可塑性明显下降，拉伸断裂从韧性转变为脆性。纳米压痕测试表明，铁素体的硬度显着增加，而奥氏体的硬度随时间的增加几乎可以忽略不计。热时效脆化主要与铁素体有关。长期热老化后，铁素体中发生旋节线分解和G相沉淀，这些反应导致铁素体相的变形能力急剧下降。裂解裂纹很容易在长期热老化的DSS的铁素体中引发和扩散。

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