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| Hydrogen embrittlement of intercritically annealed mediumMn #br#
steel (0.1C5Mn) under different rolling conditions |
| ZHAO Xiaoli1，2，ZHANG Yongjian2，HUI Weijun2，WANG Cunyu1，DONG Han1，3 |
(1. Institute of Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China；
2. School of Mechanical， Electronic and Control Engineering， Beijing Jiaotong University， Beijing 100044， China；
3. School of Materials Science and Engineering， Shanghai University， Shanghai 200072， China) |
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Abstract Although the mechanical properties of mediumMn steels， such as ultimate tensile strength (UTS) and total elongation (TEL) have been significantly enhanced in recent years， many issues related to industrial production and application， such as hydrogen related problems， should be explored further to make them commercially viable to manufacture automobile components. For this purpose，the susceptibility to hydrogen embrittlement (HE) of intercritically annealed medium Mn steel under different rolling conditions were investigated by using electrochemical hydrogen charging，thermal desorption spectrometry (TDS)，slow strain rate tensile (SSRT) test and scanning electron microscopy (SEM). For this reason，the hot rolled and warm rolled 0.1C5Mn steel sheets were annealed at 650 ℃ for 30 min (called the HRA and WRA specimens，respectively). The results show that the HRA and WRA specimens exhibit primarily lathy and lathy+globular duplex microstructures of ferrite and reverted austenite，respectively. UTS of WRA specimens are higher while TEL are lower than those of the HRA specimen，however，a strengthductility balance (UTS×TEL) as high as 33 GPa·% could be obtained for all the three kinds of specimens. Almost all the charged hydrogen is diffusible hydrogen，and the HE susceptibility of HRA is lower than，WRA. SEM analysis of fractured SSRT surfaces revealed that the HRA specimen showed a mixed transgranular plus intergranular fracture along prior austenite grain boundary，while the WRA specimens exhibited a predominant dimples fracture consisting both empty dimples and dimples filled grains，and the latter is basically a brittle intergranular cracking occurring along the boundaries of austenite and/or martensite (formerly RA) grains. The difference in HE susceptibility of the two kinds of specimens is mainly ascribed to the difference of the microstructure and the corresponding fracture characteristics.
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Received: 11 January 2019
Published: 15 November 2019
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2019, Vol. 54 
