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钢中的氢是影响物理性能和力学性能的有害元素.氢与拉应力共同作用时,在零件加工或使用中存在着氢脆及氢裂的危险性. 零件的化学成份、组织、强度、受力状况,几何形状、残余应力分布、氢的存在形态、内部缺陷性质及使用环境不同,氢脆及氢裂的敏感性也各不相同.零件内部含氢量越高,氢脆及氢裂的倾向性越大;零件强度水平性越高,应力集中系数越大,氢脆及氢裂所需的临界氢浓度和临界应力越低.大量的试验及故障分析中发现,高强度钢即使含氢量低于1ppm时,也会导致氢脆及氢裂,因此降低含氢量就显得格外重要. 要降低高强度钢零件中的含氢量,首先必须选用含氢量低的原材料,其次在加工时应尽量减少吸氢,选用少吸氢或不吸氢的工艺条件.但在实际生产中,零件的焊接,热
Hydrogen in steel is a harmful element that affects physical properties and mechanical properties.Hydrogen and tensile stress together, there is the risk of hydrogen embrittlement and hydrogen cracking in the processing or use of parts.Chemical composition, organization, strength, subject to Hydrogen embrittlement and hydrogen cracking are also different in sensitivity, strength, geometry, residual stress distribution, the existence of hydrogen, the nature of internal defects and the environment of use. The higher the degree of part strength, the greater the stress concentration factor, the lower the critical hydrogen concentration and critical stress required for hydrogen embrittlement and hydrogen cracking.A large number of tests and failure analysis found that even if the high-strength steel containing hydrogen If the amount is less than 1ppm, hydrogen embrittlement and hydrogen cracking will also be caused, so it is particularly important to reduce the hydrogen content.To reduce the hydrogen content of high strength steel parts, we must first select the raw materials with low hydrogen content, Should minimize hydrogen absorption, the choice of less hydrogen absorption or hydrogen absorption process conditions, but in actual production, the parts of the welding, heat