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Abstract:
The
tensile, impacting, fracture toughness properties and the fracture
surface of a high manganese austenitic steel are investigates from
ambient temperature to 77 K. The results show that the relation between
yield strength and temperature isσ0.2＝300＋1392.4exp（-0.0106T）. The 77K
yield strength is 883 MPa, and the Kj0.05 value is about 232 MPa•m1/2.
The cryogenic intergranular fracture is fully restricted. The 77K
fracture surfaces exhibit a tough character composed of a huge
quantitative of dimples and a little small qusi-cleavage facets. The
results of X-Ray analysis show that the austenite of the steel is stable
even under cryogenic deformation conditions.
Key words:
High
manganese austenitic steel Cryogenic property
CLC No: TG144
机械技术发展基金、国家自然科学基金资助项目. Received 20000909,
received in revised form 20001112
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