The mechanical behavior of an AISI type 310 stainless steel
- Univ. of Windsor, Ontario (Canada)
An AISI type 310 austenitic stainless steel was tensile testing over a range of strain rates, {dot {epsilon}} = 5 {times} 10{sup {minus}1} s{sup {minus}1}, and test temperatures, T = 298 to 1,073 K, in order to determine the strain rate and temperature dependencies of the plastic deformation behavior. It is found that both the yield stress, {sigma}{sub Y}, and the ultimate tensile stress, {sigma}{sub UTS}, are linearly related to the natural logarithm of strain rate, 1n {dot {epsilon}}, at all test temperatures. Serrated yielding (dynamic strain aging) was observed within a certain range of temperatures and strain rates. The dynamic strain hardening stress, {Delta}{sigma}{sub H} = {sigma}{sub UTS} {minus} {sigma}{sub Y}, is larger for lower strain rates, and the peak of the {Delta}{sigma}{sub H} vs T plot moves from about 700 to 1,000 K when the strain rate is increased from 5 {times} 10{sup {minus}5} to 5 {times} 10{sup {minus}1} s{sup {minus}1}. Both the yield stress and the ultimate tensile stress decrease with temperature in a similar manner. The ductility of the steel is also dependent on both temperature and strain rate. For lower strain rates ({dot {epsilon}} = 5 {times} 10{sup {minus}5} to 5 {times} 10{sup {minus}3} s{sup {minus}1}), the elongation to fracture, {delta}%, increases with temperature from about 38% (T = 298 to 873 K) up to 75% (T > 900 K); for higher strain rates ({dot {epsilon}} = 5 {times} 10{sup {minus}2} to 5 {times} 10{sup {minus}1} s{sup {minus}1}), {delta}% is smaller lying within the range of 29--39%. The experimental results are analyzed in terms of thermal activation processes for plastic deformation of crystalline materials. It is shown that the activation volume and activation energy are smaller at lower temperatures (298--573 K) and larger at higher temperatures (673--1,073 K) indicating two distinctive flow processes for the low and high temperature regions.
- OSTI ID:
- 27880
- Journal Information:
- Acta Metallurgica et Materialia, Vol. 43, Issue 2; Other Information: PBD: Feb 1995
- Country of Publication:
- United States
- Language:
- English
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