【摘要】 采用慢应变速率试验(SSRT)研究了高强钢40CrMoTi的氢脆敏感性与氢致附加应力的关系。试验表明,氢致附加应力aσd随试样的屈服强度sσ以及固溶氢浓度C0的对数的增加而线性升高,其关系为,aσd=-260+0.226sσ+63.9 lnC0,高强钢恒载荷下氢致滞后断裂门槛应力随氢浓度对数的升高而线性下降,即,σHIC=863-145lnC0(sσ=900 MPa),σHIC=891-183 lnC0(sσ=1 050 MPa)。预充氢试样慢应变速率拉伸时的相对断裂应力σF(H)/σF随氢浓度对数的升高而线性下降,即,σF(H)/σF=0.97-0.18 lnC0(sσ=900 MPa),σF(H)/σF=0.95-0.24 lnC0(sσ=1 050 MPa)。更多还原

【Abstract】 The relationship between hydrogen induced additive stress and threshold cracking stress of high strength steel 40CrMoTi was studied using SSRT.The hydrogen-induced additive stress,σad,increased linearly with the increase of both yield strength and logarithm of hydrogen concentration for the samples,i.e,σad=-260+0.226σys+63.9 lnC0.The threshold stress decreased with the increase of logarithm of hydrogen concentration for the samples,i.e,σHIC=863-145 lnC0(σs=900 MPa),σHIC=891-183 lnC0(σs=1 050 MPa).The relative fracture stress σF(H)/σF during charging with hydrogen decreased with the increase of logarithm of hydrogen concentration for the samples,i.e,σF(H)/σF=0.97-0.18 lnC0(σs=900 MPa),σF(H)/σF=0.95-0.24 lnC0(σs=1 050 MPa).更多还原