Sulfide Stress Cracking Behavior of a Martensitic Steel Controlled by Tempering Temperature

Materials

卷:11

Zaoneng He¹  Qingfeng Wang¹  Yu Sun¹  Fucheng Zhang¹  Qian Wang¹  Shunjie Gu¹ 

[1]Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

关键词: sulfide stress cracking (SSC);    martensitic steel;    tempering;    double cantilever beam test;    hydrogen permeation;    SSC initiation;    SSC propagation;   

DOI  :  10.3390/ma11030412

来源: DOAJ

【 摘 要 】

A medium-carbon Cr–Mo–V martensitic steel was thermally processed by quenching (Q) at 890 °C and tempering (T) at increasing temperatures from 650 °C to 720 °C and the effect of tempering temperature, Tt, on sulfide stress cracking (SSC) behaviors was estimated mainly via double cantilever beam (DCB) and electrochemical hydrogen permeation (EHP) tests and microstructure characterization. The results indicate that the threshold stress intensity factor for SSC, KISSC, increased with increasing Tt. The overall and local H concentration around the inclusions decreased with increasing Tt, due to reductions in the amounts of solute atoms, grain boundaries and dislocations, which effectively prevented SSC initiation. Also, increasing Tt caused an increased fraction of high-angle boundaries, which evidently lowered the SSC propagation rate by more frequently diverting the propagating direction and accordingly restricted SSC propagation. The overall SSC resistance of this Q&T–treated steel was therefore significantly enhanced.

【 授权许可】

Unknown