TY - JOUR
T1 - Hydrogen embrittlement of AISI 4130 steel with an alternate ferrite/pearlite banded structure
AU - Lee, Huei Long
AU - Lap-Ip Chan, Sammy
N1 - Funding Information:
This work was supported by the National Science Council of Republic of China under Contract NSC 77-0405-09. The material (AISI 4130 high strength, low alloy steel) was supplied by the Thornton Research Centre, Shell Research Ltd., Chester, U.K., and is greatly appreciated.
PY - 1991/8/30
Y1 - 1991/8/30
N2 - The effects of anisotropy on the hydrogen occlusivity, diffusivity and stepwise cracking of AISI 4130 steel with a banded ferrite/pearlite structure have been studied. To determine the hydrogen occlusivity with respect to the direction of banding, hydrogen charging in a H2S saturated saline solution was performed. After the specimens had been charged for 2 h, when they were sampled in the longitudinal direction they occluded more hydrogen than when sampled from other directions. When the specimens were sampled in the through-face direction (i.e. with the banding perpendicular to the direction of hydrogen entry), they occluded significantly less hydrogen than in the longitudinal and transverse directions. However, their hydrogen contents reached the same saturation level when the charging period was extended to 8 h. Electrochemical permeation experiments indicate that the effective hydrogen diffusivity along the through-face direction was nearly an order less than that along the other two directions. The effective hydrogen diffusivities of the specimens sectioned in the longitudinal and transverse directions were similar, but the hydrogen permeabilities were different. The results show that the permeation flux of hydrogen along the longitudinal direction was higher than that along the transverse direction. With regard to the susceptibility to hydrogen-induced stepwise cracking, the transverse-sectioned specimens suffered the largest amount of cracking, and the through-face specimens were the most resistant to hydrogen-induced cracking.
AB - The effects of anisotropy on the hydrogen occlusivity, diffusivity and stepwise cracking of AISI 4130 steel with a banded ferrite/pearlite structure have been studied. To determine the hydrogen occlusivity with respect to the direction of banding, hydrogen charging in a H2S saturated saline solution was performed. After the specimens had been charged for 2 h, when they were sampled in the longitudinal direction they occluded more hydrogen than when sampled from other directions. When the specimens were sampled in the through-face direction (i.e. with the banding perpendicular to the direction of hydrogen entry), they occluded significantly less hydrogen than in the longitudinal and transverse directions. However, their hydrogen contents reached the same saturation level when the charging period was extended to 8 h. Electrochemical permeation experiments indicate that the effective hydrogen diffusivity along the through-face direction was nearly an order less than that along the other two directions. The effective hydrogen diffusivities of the specimens sectioned in the longitudinal and transverse directions were similar, but the hydrogen permeabilities were different. The results show that the permeation flux of hydrogen along the longitudinal direction was higher than that along the transverse direction. With regard to the susceptibility to hydrogen-induced stepwise cracking, the transverse-sectioned specimens suffered the largest amount of cracking, and the through-face specimens were the most resistant to hydrogen-induced cracking.
UR - http://www.scopus.com/inward/record.url?scp=0026205347&partnerID=8YFLogxK
U2 - 10.1016/0921-5093(91)90658-A
DO - 10.1016/0921-5093(91)90658-A
M3 - 期刊論文
AN - SCOPUS:0026205347
SN - 0921-5093
VL - 142
SP - 193
EP - 201
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 2
ER -