ISSN 2594-5327
68º Congresso da ABM — vol. 68, num.68 (2013)
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Abstract
Creep behavior of AISI 310 stainless steel was studied by constant stress tests in the range from 70 to 375 MPa, at 700ºC. The variation of the initial strain rates, secondary creep rates and rupture time with stress were observed in tests carried out without interruption until the end of tertiary stage. For the secondary stage creep rates, Norton relation was verified with an exponent n=4.5 from 70 to about 130 MPa and n=7.1 from about 130 to 250 MPa. The initial strain rates were also verified to follow Norton relation with two n exponents having values similar to the secondary stage. Some creep tests were also carried out at other temperature levels between 600 and 700ºC. Monkman-Grant relation was verified to hold, with m very close to 1. In another set of experiments, activation energy values were determined by small temperature changes (+10ºC) in 3 steps above and below 700ºC, during secondary stage at various stress levels from 70 to 210 MPa. The average apparent activation energy value in this stress range was determined to be Qc=307+47 kJ/mol. The values of all these creep parameters agree well with those found for other versions of austenitic stainless steels of the 300 series. Small stress variations were also performed at strain levels above and below the establishment of minimum creep rate (secondary creep stage) for a test at 150 MPa, 700oC. A trend for increase in n and decrease in A values with creep strain around secondary creep stage was observed.
Creep behavior of AISI 310 stainless steel was studied by constant stress tests in the range from 70 to 375 MPa, at 700ºC. The variation of the initial strain rates, secondary creep rates and rupture time with stress were observed in tests carried out without interruption until the end of tertiary stage. For the secondary stage creep rates, Norton relation was verified with an exponent n=4.5 from 70 to about 130 MPa and n=7.1 from about 130 to 250 MPa. The initial strain rates were also verified to follow Norton relation with two n exponents having values similar to the secondary stage. Some creep tests were also carried out at other temperature levels between 600 and 700ºC. Monkman-Grant relation was verified to hold, with m very close to 1. In another set of experiments, activation energy values were determined by small temperature changes (+10ºC) in 3 steps above and below 700ºC, during secondary stage at various stress levels from 70 to 210 MPa. The average apparent activation energy value in this stress range was determined to be Qc=307+47 kJ/mol. The values of all these creep parameters agree well with those found for other versions of austenitic stainless steels of the 300 series. Small stress variations were also performed at strain levels above and below the establishment of minimum creep rate (secondary creep stage) for a test at 150 MPa, 700oC. A trend for increase in n and decrease in A values with creep strain around secondary creep stage was observed.
Keywords
Type 310 stainless steel; Creep behavior; Stress/temperature changes; Creep parameters.
Type 310 stainless steel; Creep behavior; Stress/temperature changes; Creep parameters.
How to refer
Junior, Archimedes Contin;
Bueno, Levi de Oliveira.
CREEP BEHAVIOR OF TYPE 310 STAINLESS STEEL. PART 1: PARAMETERS FROM THE NORTON, ARRHENIUS AND MONKMAN-GRANT RELATIONS
,
p. 4411-4423.
In: 68º Congresso da ABM,
São Paulo,
2013.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-23660
