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CHARACTER OF CARBON-DEPLETED REGIONS IN UNDERCOOLED AUSTENITE AND THERMODYANMICS OF BAINITIC TRANSFORMATION

YANG Quanmin KANG Mokuang Northwestern Polytechnical University , Xi'an , China YANG Quanmin , Dept.of Material Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

The chemical driving forces for the phase transformation from austenite in three different car- bon-depleted regions into ferrite with the identical composition have been derived respectively. The starting temperature of bainitic transformation,B_s,has also been calculated according to the shearing mechanism of bainitic transformation in carbon-depleted regions of austenite. The maximum driving forces for banitic transformation at B_s in both 3% Cr and the CrMo steels were obtained.It was shown that the proposed shearing mechanism of the bainitic trans- formation is thermodynamically possible.

关键词: bainitic , null , null

HYDROGEN STORAGE PROPERTIES OF Mg MODIFIED WITH TETRAHYDROFURAN

AO Ming , WANG Qidong Zhejiang University , Hangzhou China Dept.of Materials Science , Zhejiang University , Hangzhou 310013 , China

金属学报(英文版)

The hydriding and dehydriding behaviors of tetrahydrofuran modified Mg,its electronic struc- ture,crystal structure,micro-morphology as well as its stability have been investigated.The modifield Mg absorbs 3.5 wt-% hydrogen at 643 K in 3.5 MPa H_2,its hydride gives off 3.2 wt-% hydrogen at 643 K in a vaccum of 1.3 Pa after 20 cycles of hydriding and dehydriding. Tetrahydrofuran alters the electronic structure of Mg but keeps its crystal strueture unchanged.In hydriding products,a new hydride phase is found in addition to the known MgH_2 phase.The hydride formed from Mg is polv-erystalline.The wide-spreading slip bands and twins within crystals indicate that the transformation during absorption of hydrogen causes serious lattice distortions.

关键词: Mg , null , null , null , null

MECHANISM OF DEUTERIUM CRACKING IN PALLADIUM

SUN Dalin LEI Yongquan CHEN Yanglin WU Jing WANG Qidong Zhejiang University , Hangzhou , China Department of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

After 290 h electrochemical charging of deuterium,the density of dislocation in well-annealed Pd was increased from 10~8/cm~2 to over 10~12/cm~2 and a large amount of bubble-like voids or cracks was observed by optical and transmission electron microscopes.The mechanism of deuterium cracking is believed due to the formation of molecular De during the segregstion and combination of deuterium atoms around dislocations.XRD results showed that the lattice constant of Pd increased from 0.3890 nm to 0.4034 nm.

关键词: deuterium cracking , null

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