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Low-temperature mechanical properties of stainless steel 316L: Tests and constitutive models
Highlights Stainless steel (SS) 316L exhibits different stress–strain curves from ambient ones. Decreasing T from 20 to −80℃ linearly increases the yield strength of SS 316L. Decreasing T increases the ultimate strength, but reduces the ductility of SS 316L. Proposed analytical models predict well low-temperature stress–strain curves of SS 316L.
Abstract To investigate mechanical behaviours of structural stainless steel (SS) 316L at cold-region cooling environment, this paper firstly performed tension tests on SS 316L at varying low temperatures. Thirty-two standard samples in different thickness, cut from different square/circular SS tubes, were tested under combined uniaxial tension and varying low temperatures (T) of −80, −60, −30, and 20 °C. These tests showed that the low-temperature stress–strain (σ-ε) curves behave differently from those ambient-temperature ones, which exhibits “S”-shaped strain hardening stages with a much larger sloped second strain hardening stage than that of the first strain hardening stage. Decreasing T from 20 to −80 °C increased the elastic modulus (E), yield (σ 0.2) and ultimate (σ u) strength of SS 316L, but reduced its ultimate (εu) and fracture (εF) strains as well as the ductility. However, all the SS 316L samples failed in ductile mode even though their ductility was compromised. Empirical models were also developed to estimate the enhancing factors for E, σ 0.2, σ u, and εu due to low temperatures using the best subset regression analysis method. In addition, modified true σ-ε constitutive models at low temperatures were also developed for SS 316L. The validations proved that the developed constative models described well the σ-ε behaviour of SS 316L at a low temperature range of −80 ∼ 20 °C.
Low-temperature mechanical properties of stainless steel 316L: Tests and constitutive models
Highlights Stainless steel (SS) 316L exhibits different stress–strain curves from ambient ones. Decreasing T from 20 to −80℃ linearly increases the yield strength of SS 316L. Decreasing T increases the ultimate strength, but reduces the ductility of SS 316L. Proposed analytical models predict well low-temperature stress–strain curves of SS 316L.
Abstract To investigate mechanical behaviours of structural stainless steel (SS) 316L at cold-region cooling environment, this paper firstly performed tension tests on SS 316L at varying low temperatures. Thirty-two standard samples in different thickness, cut from different square/circular SS tubes, were tested under combined uniaxial tension and varying low temperatures (T) of −80, −60, −30, and 20 °C. These tests showed that the low-temperature stress–strain (σ-ε) curves behave differently from those ambient-temperature ones, which exhibits “S”-shaped strain hardening stages with a much larger sloped second strain hardening stage than that of the first strain hardening stage. Decreasing T from 20 to −80 °C increased the elastic modulus (E), yield (σ 0.2) and ultimate (σ u) strength of SS 316L, but reduced its ultimate (εu) and fracture (εF) strains as well as the ductility. However, all the SS 316L samples failed in ductile mode even though their ductility was compromised. Empirical models were also developed to estimate the enhancing factors for E, σ 0.2, σ u, and εu due to low temperatures using the best subset regression analysis method. In addition, modified true σ-ε constitutive models at low temperatures were also developed for SS 316L. The validations proved that the developed constative models described well the σ-ε behaviour of SS 316L at a low temperature range of −80 ∼ 20 °C.
Low-temperature mechanical properties of stainless steel 316L: Tests and constitutive models
Yan, Jia-Bao (author) / Geng, Yiteng (author) / Xie, Peng (author) / Xie, Jian (author)
2022-06-10
Article (Journal)
Electronic Resource
English
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