INTERACTION OF HIGH CYCLE FATIGUE AND CREEP IN 9%Cr‐1%Mo STEEL AT ELEVATED TEMPERATURE

Fatigue and Fracture of Engineering Materials and Structures - Tập 18 Số 1 - Trang 27-35 - 1995
R. Vašina1, P. Lukáš1, Ludvík Kunz1, V. Sklenička1
1Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Fiova 22, Brno, 616 62 Czech Republic

Tóm tắt

AbstractHigh‐cycle‐fatigue/creep experiments were performed on a 9%Cr‐1%Mo temperered marten‐site ferritic steel at 873 K in air. The stress ratio R=σmin/σmax ranged from‐1 (“pure” fatigue) to 1 (“pure” creep). The maximum stress σmax was kept constant at 240 MPa. The lifetime depends on the stress ratio R in a non‐monotonic way.In the stress ratio interval 0.6 < R < 1.0 both the creep strain rate and the lifetime are controlled by mean stress σmassof the stress cycle. In the stress ratio interval — 1 < R < 0.2 the lifetime is controlled by the stress amplitude na. The fatigue/creep interaction occurs in between these intervals.The fatigue/creep loading induces transformation of the tempered martensite ferritic structure into an equiaxed subgrain structure. The resulting subgrain size depends strongly on the stress ratio.

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Tài liệu tham khảo

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Fatigue and Fracture of Engineering Materials and Structures

Tập 18 Số 1

27-35

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