SURFACE INVESTIGATION OF EXCIMER-LASER IRRADIATED PHOSPHATIZED STEEL PLATES

被引:12
作者
SCHAAF, P
EMMEL, A
SCHUBERT, E
BERGMANN, HW
LIEB, KP
机构
[1] EVUS,ATZ,APPLIKAT & TECH ZENTRUM,D-92249 VILSECK,GERMANY
[2] UNIV ERLANGEN NURNBERG,FORSCH VERBUND LASERTECHNOL ERLANGEN,LEHRSTUHL WERKSTOFFWISSENSCH MET,D-91058 ERLANGEN,GERMANY
来源
HYPERFINE INTERACTIONS | 1994年 / 92卷 / 1-4期
关键词
D O I
10.1007/BF02065779
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Steel plates (St 14-05) of 1.5 mm thickness and coated with 1.5 mu m of ironzinc-phosphatehydrate (ASTM 29-1429) were irradiated with an XeCl-excimer laser (Siemens XP 2020) at energy densities of 20-80 mJ/mm(2) and with 2-32 pulses per spot. Depth-sensitive Mossbauer spectroscopy was carried out by means of conversion electron (CEMS) and conversion X-ray (CXMS) Mossbauer spectroscopy in order to determine the phases produced by the excimer laser treatment. Although the phosphate layer is mainly ablated during the laser treatment, there is a significant formation of Fe2P. The phosphorous phase and the wustite, with changing stoichiometries, were found in the very surface (CEMS). In deeper layers and in correlation with the energy density and the number of pulses, austenite was found in surprisingly high amounts (CEMS and CXMS). The austenite was found to be nitrogen austenite. The high Fe-N austenite content as well as the presence of some ferromagnetic Fe-N phase (epsilon-Fe2+xN) must be ascribed to an unexpectedly high nitriding effect during the laser treatment.
引用
收藏
页码:1361 / 1366
页数:6
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