【摘要】：通過氫滲透測試、氫擴(kuò)散模擬以及氫含量測試技術(shù)研究X70鋼在模擬4 MPa總壓,0.2 MPa氫氣分壓煤制氣環(huán)境下的充氫過程,并通過沖擊韌性測試、裂紋擴(kuò)展測試以及缺口拉伸和慢應(yīng)變速率拉伸測試方法,從不同角度分析X70鋼母材和焊縫組織在模擬煤制氣含氫環(huán)境下的力學(xué)性能.結(jié)果表明,在總壓4 MPa,0.2 MPa含氫煤制氣環(huán)境中,X70鋼表面存在吸附氫原子并能擴(kuò)散進(jìn)入X70鋼內(nèi)部,達(dá)到穩(wěn)態(tài)后內(nèi)部的可擴(kuò)散氫質(zhì)量分?jǐn)?shù)為1.9×10~(-7);與空氣中的原始性能比較,X70鋼焊縫和母材的沖擊性能、缺口拉伸和慢應(yīng)變速率拉伸強(qiáng)度、塑性以及材料的損傷容限均未發(fā)生下降;在實驗煤制氣環(huán)境中,X70鋼具有較低的氫脆風(fēng)險.
[Abstract]:Through hydrogen permeation test, hydrogen diffusion simulation and hydrogen content test technology, the hydrogen charging process of X70 steel under 4 MPa total pressure 0.2 MPa hydrogen partial pressure coal gas environment was studied, and the impact toughness was tested. Crack growth test and notched tensile and slow strain rate tensile testing methods were used to analyze the mechanical properties of the base metal and weld microstructure of X70 steel under the condition of simulating hydrogen content of coal gas from different angles. The results show that there are adsorbed hydrogen atoms on the surface of X70 steel in the environment of 4MPa ~ (0.2) MPa hydrogen-containing coal gas, which can diffuse into the X70 steel. The mass fraction of diffusible hydrogen is 1.9 脳 10 ~ (-7) after steady state. Compared with the original properties in air, the impact properties, notched tensile strength and slow strain rate tensile strength, plasticity and damage tolerance of X70 steel have not decreased. The X70 steel has a lower hydrogen embrittlement risk in the experimental coal gasification environment.
【作者單位】： 北京市燃?xì)饧瘓F(tuán)有限公司運營調(diào)度中心;安科工程技術(shù)研究院(北京)有限公司;
【分類號】：TG142.1
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本文編號：2185949