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首页> 外文期刊>ISIJ international >Delayed Fracture Properties of 1500 MPa Bainite/Martensite Dual-phase High Strength Steel and Its Hydrogen Traps
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Delayed Fracture Properties of 1500 MPa Bainite/Martensite Dual-phase High Strength Steel and Its Hydrogen Traps

机译：1500 MPa贝氏体/马氏体双相高强钢及其氢阱的延迟断裂性能

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摘要

It is very imperative to improve delayed fracture properties of high strength steel, which may enlarge its usage. The published literature shows that the susceptibility to hydrogen embrittlement of a novel 1 500 MPa bainite/martensite dual-phase high strength steel is inferior to that of conventional quench-tempered high strength steel. The stress corrosion cracking (SCC) in a 3.5% NaCl solution for novel 1 500MPa bainite/martensite dual-phase high strength steel was investigated in this paper by using modified wedge-opening-loading (WOL) specimens. The experimental results show that K_(ISCC) for novel 1 500 MPa bainite/martensite dual-phase high strength steel is larger than 50 MPa+m~(1/2), exceeding conventional high strength steel. Its crack growth rate (da/dt)_(II) is about 1x10~(-5)mm/s, which is less than that of conventional high strength steel. Hydrogen trapping phenomena in the steel were investigated by electrochemical permeation technique. The lath boundaries and stable retained austenite are beneficial hydrogen trap, slowing down the segregation of hydrogen on the crack tip, hence K_(ISCC) increases and crack growth rate decreases.
机译：必须提高高强度钢的延迟断裂性能，这可能会扩大其用途。公开的文献表明，新型的1500 MPa贝氏体/马氏体双相高强度钢对氢脆的敏感性不如传统的淬火回火高强度钢。本文采用改进的楔形张开载荷（WOL）试样，研究了新型1500MPa贝氏体/马氏体双相高强度钢在3.5％NaCl溶液中的应力腐蚀开裂（SCC）。实验结果表明，新型1500 MPa贝氏体/马氏体双相高强度钢的K_（ISCC）大于50 MPa + m〜（1/2），超过了常规高强度钢。裂纹扩展速率（da / dt）_（II）约为1x10〜（-5）mm / s，低于常规高强度钢。通过电化学渗透技术研究了钢中的氢捕获现象。板条边界和稳定的残余奥氏体是有益的氢陷阱，减缓了裂纹尖端氢的偏析，因此K_（ISCC）增大，裂纹扩展率降低。

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