Einfluß der Kugelstrahlparameter auf die Randschichteigenschaften von 42CrMo4
Einfluß der Kugelstrahlparameter auf die Randschichteigenschaften von 42CrMo4
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42CrMo4
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
O. Vöhringer
中科院分区：
文献类型：
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作者：
H. Holzapfel;A. Wick;V. Schulze;O. Vöhringer
系统研究了喷丸技术中重要的喷丸参数喷丸压力、质量流量、硬度和喷丸颗粒尺寸对表层性能的影响。对硬度在 230 至 660 HV0.3 之间的不同热处理钢 AISI 4140（德国牌号 42CrMo4）样品进行喷丸处理。通过使用 X 射线衍射测量残余应力和干涉线半宽并确定表面粗糙度来表征表面层。随着工件硬度的增加，观察到表面下方压缩残余应力的特征最大值。喷丸强度的增加会导致压缩残余应力渗透得更深。在喷丸过程中，软材料条件下表面附近的半宽度会增加，而硬材料条件下这些值会减小。半宽的增加是由软材料条件下位错的倍增以及硬材料条件下高密度位错重新排列到能量上更有利的位置引起的。
The effects of the technically important shot peening parameters peening pressure, mass flow, hardness and size of the shot particles on the surface layer properties were studied systematically. Samples of the differently heat treated steel AISI 4140 (German grade 42CrMo4) with a hardness between 230 and 660 HV0.3 were shot peened. The surface layers were characterized by measuring the residual stresses and the half widths of interference lines using X-ray diffraction and by determining the surface roughness. With increasing workpiece hardness characteristic maxima of the compressive residual stresses beneath the surface are observed. An increasing peening intensity causes a deeper penetration of the compressive residual stresses. During shot peening the half widths near the surface increase for soft material conditions, whereas these values decrease for hard material conditions. The increase of the half widths is caused by a multiplication of dislocations in soft material conditions and by a rearrangement of dislocations of high density to energetically more favourable positions in hard material conditions.