CAJ | 학술논문

为评价改良冶炼工艺下的新型15CrMoR( H)材料在饱和硫化氢( H2 S)中抗环境开裂的综合性能,依据NACE及国家标准,从恒载拉伸、三点弯曲、氢致开裂3个角度对材料进行了系统的试验研究,并对恒载拉伸试验结果进行分析与拟合,给出了材料应力-寿命的数学模型.结果表明：恒载拉伸应力腐蚀门槛值滓th为0.7ReL (252 MPa),三点弯曲名义应力SC大于4.5ReL(1620 MPa),HIC试验中裂纹长度率CLR为4.40%、裂纹厚度率CTR为0.87%、裂纹敏感率CSR为0.04%,与EFC规定的合格标准相比较,分别为3.4、3.4及37.5倍.不同角度的多项试验结果均说明该材料具有优良的抗硫化氢环境开裂能力.
위평개개량야련공예하적신형15CrMoR( H)재료재포화류화경( H2 S)중항배경개렬적종합성능,의거NACE급국가표준,종항재랍신、삼점만곡、경치개렬3개각도대재료진행료계통적시험연구,병대항재랍신시험결과진행분석여의합,급출료재료응력-수명적수학모형.결과표명：항재랍신응력부식문함치재th위0.7ReL (252 MPa),삼점만곡명의응력SC대우4.5ReL(1620 MPa),HIC시험중렬문장도솔CLR위4.40%、렬문후도솔CTR위0.87%、렬문민감솔CSR위0.04%,여EFC규정적합격표준상비교,분별위3.4、3.4급37.5배.불동각도적다항시험결과균설명해재료구유우량적항류화경배경개렬능력.
To evaluate the hydrogen resistant properties of the 15 CrMoR ( H ) with a new smelting process, according to NACE and National Standards, three tests including NACE standard tensile test, NACE standard bent-beam test and hydrogen induced cracking test were executed in saturated hydrogen sulfide ( H2 S) environment. Stress-life mathematical model of this material was given by analyzing and fitting the results of tensile test. Test results show that the threshold σth of tensile test is 0.7ReL (252 MPa);the threshold nominal stress SC of bent-beam is higher than 4.5ReL (1 620 MPa); and for HIC test, the crack length rate ( CLR) is 4.40%, the crack thickness rate ( CTR) is 0.87% and the crack sensitive rate (CSR) is 0.04%. Compared with the EFC standard, the safety margin of HIC test is 3.4, 3.4 and 37.5 times, respectively. All the experimental results show that the new 15CrMoR(H) material has excellent H2 S environmental cracking resistance properties.