| Title |
Load - Controlled Tensile Properties of AISI 300 Series Stainless Steels at Cryogenic Temperatures |
| Authors |
이해무(Hae Moo Lee); 김시천(Si Cheon Kim); 방건웅(Gun Woong Bahng) |
| Abstract |
In case of cryogenic structures such as superconducting magnets and pressure vessels, the structural material experiences unrestricted force. It is, therefore, desirable to characterize the load-controlled tensile properties at cryogenic temperatures to simulate operating condition. At 4 K, however, discontinuous yielding occurs, which arises mainly from low specific heat and thermal conductivity of the materials at low temperatures, and it affects the load-displacement or stress-strain curves. In this study, load-controlled tensile tests were conducted at 77 ad 4K on AISI 300 series stainless steels. The load rate was varied from 5 to 5000 N/s. The effect of load rate and testing temperature on tensile properties of 300 series stainless steels were observed. A model which correlate discontinuous yielding and ultimate tensile strength was proposed. |