【摘要】：采用YLS-3000型光纖激光器對(duì)40Cr鋼表面進(jìn)行不同間距的網(wǎng)格掃描激光相變硬化。研究不同網(wǎng)格間距對(duì)硬化層的顯微組織、硬度、耐磨性和耐蝕性的影響。結(jié)果表明:激光相變硬化層橫截面由表及里依次可分為相變硬化區(qū)、過(guò)渡區(qū)和基體。相變硬化區(qū)的組織為細(xì)小針狀馬氏體+少量殘余奧氏體,過(guò)渡區(qū)的組織為馬氏體+殘余奧氏體+鐵素體+未溶碳化物,基體的組織為鐵素體+珠光體。網(wǎng)格掃描相變硬化層的平均硬度約為61 HRC,網(wǎng)格交叉點(diǎn)的平均硬度可達(dá)62 HRC。隨著網(wǎng)格間距的增加,試樣的相對(duì)耐磨性先增大再減小,當(dāng)網(wǎng)格間距為12 mm時(shí),相對(duì)耐磨性可達(dá)基體的3.25倍。同時(shí),此間距試樣的鈍化區(qū)間最寬,約為1530 m V,耐蝕性最強(qiáng)。
[Abstract]:The grid scanning laser transformation hardening of 40Cr steel surface with different spacing was carried out by using YLS- 3000 fiber laser. The effects of different grid spacing on microstructure, hardness, wear resistance and corrosion resistance of hardened layer were studied. The results show that the cross section of laser transformation hardened layer can be divided into phase transformation hardening zone, transition zone and matrix in turn. In the transformation hardening zone, the microstructure of the transformation hardening zone is a small amount of retained Austenite, the microstructure of the transition zone is the unsoluble carbide of the martensite retained Austenite, and the microstructure of the matrix is Ferrite pearlite. The average hardness of the phase change hardened layer scanned by grid scanning is about 61 HRC,. The average hardness of the grid intersection can reach 62 HRC.. With the increase of grid spacing, the relative wear resistance of the samples increases at first and then decreases. When the grid spacing is 12 mm, the relative wear resistance can reach 3.25 times of that of the matrix. At the same time, the passivation range of the sample is the widest, about 1530 MV, and the corrosion resistance is the strongest.
【作者單位】： 遼寧工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：遼寧省教育廳一般項(xiàng)目(L2015238) 遼寧省科技廳博士啟動(dòng)項(xiàng)目(201601342)
【分類號(hào)】：TG665

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