分级时效处理，低温下先让合金内部的宏观应力松弛，再在较高温度下时效，可有效地避免棒材纵向开裂。
However, stepped aging, which relaxes internal macro-stress under lower temperature then ages under higher temperature, can avoid longitudinal cracks effectively.
结果表明，NBC合金经过分级时效处理后， 耐磨性、 耐腐蚀性和电导率有所提高，而显微硬度无明显变化；
The results show that multi-stage aging treatment can increase wear resistance, corrosion resistance and electrical properties of NBC alloy, but microhardness has not changing apparently.
合金采用分级时效工艺处理后，可得到高的硬度(HV171)和较高的导电率(5 9.5 % IACS)。
When the grading aging is adopted, the high hardness (HV171) and electrical conductivity (59.5%iacs) will be obtained.
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