1Cr11Ni2W2MoV馬氏體不銹鋼冷拉棒材的力學性能研究
首發時間:2021-08-20
摘要:利用拉伸試驗、硬度試驗和光學顯微鏡等手段對1Cr11Ni2W2MoV馬氏體不銹鋼冷拉棒材的顯微組織和力學性能進行分析。實驗結果表明:在位錯強化和細晶強化的雙重作用下,隨著冷拉變形量的增加,1Cr11Ni2W2MoV馬氏體不銹鋼棒材的抗拉強度、屈服強度和硬度逐漸增加,其棒材晶粒度也隨之變細。經過退火和調質之后,當冷拉拔棒材累計變形量達到57.96%)時,抗拉強度(Rm)、屈服強度(Rp0.2)、斷后延伸率(A)、斷面收縮率(Z)和布氏硬度分別達到了1087MPa,903MPa,16.5%,62.5%和287HBW;隨著變形量的再次增加,其力學性能只有些許變化。因為變形量增加到一定程度后,鋼的晶粒級基本不再變化,位錯密度也沒有之前增加的那么迅速,此時的加工硬化主要以位錯強化為主。從而使鋼的性能趨于一個固定值,不再發生顯著變化。
關鍵詞: 馬氏體不銹鋼 冷拔材 變形量 力學性能 位錯強化 細晶強化
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Study on Mechanical Properties of 1Cr11Ni2W2MoV Martensitic Stainless Steel Cold-drawn Bar
Abstract:The microstructure and mechanical properties of 1Cr11Ni2W2MoV martensitic stainless steel wire of cold-drawn were analyzed by tensile test, hardness test and optical microscopy. The experimental results show that the tensile strength, yield strength and hardness of 1Cr11Ni2W2MoV martensitic stainless steel bars gradually increase with the increase of cold-drawing deformation under the dual action of dislocation strengthening and fine grain strengthening, and the grain size of the bars also becomes fine. After annealing and tempering, when the cumulative deformation of cold-drawn bar reached 57.96%, the tensile strength (Rm), yield strength (Rp0.2), elongation after fracture (A), section shrinkage (Z) and Brinell hardness attained 1087MPa, 903MPa, 16.5%, 62.5% and 287HBW, respectively. Because when the deformation increases to a certain extent, the grain size of steel basically not change, and the dislocation density not increase so rapidly as before, the work hardening was mainly dominated by dislocation strengthening.So that the steel properties tend to a fixed value, no longer significant changes.
Keywords: martensitic stainless steel cold drawn bar deflection mechanical properties dislocation strengthening fine grain strengthening
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1Cr11Ni2W2MoV馬氏體不銹鋼冷拉棒材的力學性能研究
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