Zhongguang WANG
,
Xiaowu LI
,
Zhefeng ZHANG
,
Weiping JIA
,
Shouxin LI
材料科学技术（英文）
In the present work, the cyclic deformation behavior of Cu single crystals oriented for double- and multiple slip as well as Cu bicrystals and tricrystals was investigated under constant plastic strain control at room temperature in air. The main objectives of the study are: (1) to find out the effects of crystallographic orientation and grain boundary (GB) on the cyclic stress-strain (CSS) curves; (2) to compare the cyclic deformation behavior of the double-, multiple-slip crystals, bicrystals and tricrystals with that of single-slip oriented crystals and to correlate the results with those of polycrystals; (3) to examine the corresponding dislocation structures; (4) to investigate the interactions of persistent slip bands (PSBs) with GBs and triple joint (TJ) as well as intergranular fatigue cracking in Cu bicrystals and tricrystals.
关键词:
Jun TAN
,
Luming MA
,
Shouxin LI
,
Lijian RONG
,
Jincai YUAN
,
Yiyi LI
材料科学技术（英文）
The influence of carbon and phosphorus on the solidification microstructure of a Cr-Ni-Mn-N austenitic steel was studied. The button specimens were prepared by vacuum induction melting and magnetic convection. The experimental results show that the increase of C or P concentration in the steel can change the solidification modes of Cr-Ni-Mn-N austenitic steels and has a significant effect on the morphology of the dendrites. The content of delta -ferrite in the microstructure reduces with increasing the concentration of C or P in the steel, there is a gradient of the content of delta -ferrite formed from surface through the center of the specimens.
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