本文通过系列氢含量试样的慢拉伸试验研究了34 CrNi3 Mo转子钢的氢致脆化.得到了如下结果:(1)随钢中氢含量的增加与应变速率的减慢,钢的塑性急剧下降。当钢中氢含量达到5mL/100g、拉伸应变速率为3×10~(-5)s~(-1)时,34CrNi3Mo转子钢的塑性几乎完全丧失.此转子钢的无白点极限含氢量力2mL/100g;无氢脆极限含氢量为1.48mL/100g. 扫描电镜观察表明,在慢拉伸试样中白点呈边界清晰的近于椭圆形的斑点,其微观形貌为走向比较清楚的撕裂岭与准解理小平面构成的穿晶准解理。
The hydrogen-induced embrittlement of rotor steel 34CrNi3Mo was studied by means of slow tensile test of specimens with various hydrogen contents. With the increase of hydrogen content in the steel and the retardation of strain rate, its plasticity drops sharply till almost wholly lost when hydrogen stexceeded 5mL/100g and strain rate was down to 3×10~(-5)s~(-1). The hydrogen content of steel to free flake or hydrogen-induced embrittlement is limited to 2 or 1.48mL/100g respectively. SEM observation shows that the flakes in slow tensile tested specimens revealed their elliptical freckles of sharp boundaries and the micromorphology is transgranular quasi-cleavage consisting of clear tearing ridges and tiny quasi-cleavage planes.
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