The Effect of Surface Finish on Low-Temperature Acetylene-Based Carburization of 316L Austenitic Stainless Steel

In this work, the effect of surface self-nanocrystallization on low-temperature gas carburizing for AISI316L austenitic stainless steel has been studied. The surface ultrasonic rolling processing (SURP) was used to prepare nanostructured surface layers, and then the un-SURP and SURP samples were treated by LTGC at 470 °C for 10 h, 20 h and 30 h. In order to analyze the effect of surface self-nanocrystallization on low-temperature gas carburizing, optical microscopy (OM), atomic force microscope (AFM), scanning electron probe micro-analyzer (EPMA) and nano-indentation analyzer were used. The results show depth of SURP-induced plastic deformation layer was about 330 μm. Meanwhile, the surface hardness and elastic modulus were increased but the surface roughness decreased obviously after SURP. After low-temperature gas carburizing, according to the results of the thickness, carbon concentration, nano-hardness and elastic modulus of the carburized layer, the conclusion is that surface self-nanocrystallization carried by SURP has a negative effect on the low-temperature gas carburizing for AISI316L austenitic stainless steel and with the increase of carburizing time, the greater the adverse effect on carburizing.

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Effect of low-temperature surface hardening by carburization on the fatigue behavior of AISI 316L austenitic stainless steel

Materials Science and Engineering A ◽

10.1016/j.msea.2019.138524 ◽

2020 ◽

Vol 769 ◽

pp. 138524 ◽

Cited By ~ 6

Author(s):

Yawei Peng ◽

Zhe Liu ◽

Chaoming Chen ◽

Jianming Gong ◽

Marcel A.J. Somers

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Low Temperature ◽

Surface Hardening ◽

Fatigue Behavior ◽

Aisi 316L ◽

316L Austenitic Stainless Steel ◽

Temperature Surface

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Effect of Surface Finish and Loading Conditions on the Low Cycle Fatigue Life of Stainless Steel Welded Piping in PWR Environment

Volume 1A: Codes and Standards ◽

10.1115/pvp2013-97157 ◽

2013 ◽

Author(s):

Yuichi Fukuta ◽

Yuichiro Nomura ◽

Seiji Asada

Keyword(s):

Stainless Steel ◽

Fatigue Life ◽

Austenitic Stainless Steel ◽

Surface Finish ◽

Loading Condition ◽

Low Cycle Fatigue ◽

Complex Loading ◽

Fatigue Tests ◽

Cycle Fatigue ◽

Effect Of Surface

NUREG/CR-6909 of USA and JSME of Japan proposed new rules for evaluating environmental effects in fatigue analyses of reactors components. These rules were established from a lot of fatigue data with polished specimens under simple loading condition. The effects of surface finish or complex loading condition were reported in some papers, but these data were obtained with the simple shaped specimens. In order to evaluate the effects of surface finish and loading condition and to confirm the applicability of the proposed rules to actual components, Low Cycle Fatigue tests are performed in PWR environment with the specimens cut from 316 austenitic stainless steel welded piping. The pipes are machined to have three levels of surface finish condition and the load pattern simulating the thermal stress is applied to specimens. In this study, the effect of surface finish on fatigue life is included to be small for 316 austenitic stainless steel welded piping. Considering the insensitive region in the current evaluation rule, predicted accuracy is increased and possibility of improving the current rule is indicated.

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