随着热输入增大，焊缝柱状晶宽度增大，焊缝中针状铁素体板条有粗化的趋势；
With the increasing of heat input, the width of columnar crystal is increased, the dimension of acicular ferrite of weld metal is increased.
对铌含量分别为0.24、0.15和0.08%的三炉微合金化钢中碳化铌在铁素体中的沉淀进行了较为深入的研究。
With three microalloy steels containing 0.24, 0.15, and 0.08% niobium respectively, the precipitation of niobium carbide in ferrite has been studied.
通过在中硅耐热铸铁中添加不同组合的合金元素稀土、铜、钛使其合金化，经过孕育和球化处理，得到铁素体+珠光体+球状石墨的金相组织。
Adding different alloy combination of re, copper and titanium, then through gestation and nodulizing disposal, we got the fine texture of ferrite pearlite and spheroidal graphite.
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